Csharp/CSharp Tutorial/GUI Windows Forms/TextBox
Содержание
- 1 Count lines in the TextBox and read text in TextBox line by line
- 2 Get input value from TextBox and display it vis a messagebox
- 3 Multiline TextBox
- 4 Simple Editor
- 5 TextBox cancel event
- 6 TextBox Keyevent hander
- 7 TextBox key pressed event
- 8 TextBox Modified and TextChanged
- 9 TextBox: Multiline and BorderStyle
- 10 TextBox selection
- 11 TextBox validation
- 12 Use Regular Expression to Check the input for a TextBox
Count lines in the TextBox and read text in TextBox line by line
<source lang="csharp">using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public partial class Form1 : Form {
public Form1()
{
InitializeComponent();
}
private void showLinesButton_Click(object sender, EventArgs e)
{
StringBuilder lineInfo = new StringBuilder();
lineInfo.Append("There are " + multiLineBox.Lines.Length.ToString() + " lines.\n");
foreach (string line in multiLineBox.Lines)
{
lineInfo.Append(line + "\n");
}
MessageBox.Show(lineInfo.ToString());
}
} partial class Form1 {
private void InitializeComponent()
{
this.multiLineBox = new System.Windows.Forms.TextBox();
this.showLinesButton = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// multiLineBox
//
this.multiLineBox.Location = new System.Drawing.Point(12, 12);
this.multiLineBox.Multiline = true;
this.multiLineBox.Name = "multiLineBox";
this.multiLineBox.Size = new System.Drawing.Size(268, 213);
this.multiLineBox.TabIndex = 0;
//
// showLinesButton
//
this.showLinesButton.Location = new System.Drawing.Point(205, 231);
this.showLinesButton.Name = "showLinesButton";
this.showLinesButton.Size = new System.Drawing.Size(75, 23);
this.showLinesButton.TabIndex = 1;
this.showLinesButton.Text = "Show Lines";
this.showLinesButton.Click += new System.EventHandler(this.showLinesButton_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.showLinesButton);
this.Controls.Add(this.multiLineBox);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.PerformLayout();
}
private System.Windows.Forms.TextBox multiLineBox;
private System.Windows.Forms.Button showLinesButton;
} public class TextBoxLineCountText {
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}</source>
Get input value from TextBox and display it vis a messagebox
<source lang="csharp">using System; using System.Windows.Forms; class GetValueFromTextBox : Form {
private Label label1;
private TextBox textBox1;
private Button button1;
public GetValueFromTextBox()
{
this.label1 = new Label();
this.textBox1 = new TextBox();
this.button1 = new Button();
this.SuspendLayout();
this.label1.Location = new System.Drawing.Point(16, 36);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(128, 16);
this.label1.TabIndex = 0;
this.label1.Text = "Please enter your name:";
this.textBox1.Location = new System.Drawing.Point(152, 32);
this.textBox1.Name = "textBox1";
this.textBox1.TabIndex = 1;
this.textBox1.Text = "";
this.button1.Location = new System.Drawing.Point(109, 80);
this.button1.Name = "button1";
this.button1.TabIndex = 2;
this.button1.Text = "Enter";
this.button1.Click += new System.EventHandler(this.button1_Click);
this.ClientSize = new System.Drawing.Size(292, 126);
this.Controls.Add(this.button1);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.label1);
this.Name = "form1";
this.Text = "";
this.ResumeLayout(false);
}
private void button1_Click(object sender, System.EventArgs e)
{
Console.WriteLine(textBox1.Text);
MessageBox.Show(textBox1.Text);
}
[STAThread]
public static void Main()
{
Application.EnableVisualStyles();
Application.Run(new GetValueFromTextBox());
}
}</source>
Multiline TextBox
<source lang="csharp">using System; using System.ruponentModel; using System.Windows.Forms; public class TextBoxMultiline : System.Windows.Forms.Form {
private System.ruponentModel.Container components = null;
private System.Windows.Forms.Button btnPasswordDecoderRing;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.TextBox passwordBox;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox capsOnlyBox;
private System.Windows.Forms.Button btnGetMultiLineText;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox multiLineBox;
public TextBoxMultiline()
{
InitializeComponent();
CenterToScreen();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.capsOnlyBox = new System.Windows.Forms.TextBox();
this.multiLineBox = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.passwordBox = new System.Windows.Forms.TextBox();
this.btnGetMultiLineText = new System.Windows.Forms.Button();
this.btnPasswordDecoderRing = new System.Windows.Forms.Button();
this.label3 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// capsOnlyBox
//
this.capsOnlyBox.CharacterCasing = System.Windows.Forms.CharacterCasing.Upper;
this.capsOnlyBox.Location = new System.Drawing.Point(14, 176);
this.capsOnlyBox.Name = "capsOnlyBox";
this.capsOnlyBox.Size = new System.Drawing.Size(120, 20);
this.capsOnlyBox.TabIndex = 3;
this.capsOnlyBox.Text = "";
//
// multiLineBox
//
this.multiLineBox.AcceptsReturn = true;
this.multiLineBox.AcceptsTab = true;
this.multiLineBox.Location = new System.Drawing.Point(152, 8);
this.multiLineBox.Multiline = true;
this.multiLineBox.Name = "multiLineBox";
this.multiLineBox.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
this.multiLineBox.Size = new System.Drawing.Size(240, 104);
this.multiLineBox.TabIndex = 0;
this.multiLineBox.Text = "Type some stuff here (and hit the return and tab keys...)";
//
// label1
//
this.label1.Font = new System.Drawing.Font("Microsoft Sans Serif", 10F);
this.label1.Location = new System.Drawing.Point(8, 8);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(136, 56);
this.label1.TabIndex = 1;
this.label1.Text = "A multiline textbox that accepts tabs and return keystrokes.";
//
// label2
//
this.label2.Font = new System.Drawing.Font("Comic Sans MS", 12F);
this.label2.Location = new System.Drawing.Point(14, 144);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(106, 24);
this.label2.TabIndex = 4;
this.label2.Text = "Caps only!!";
//
// passwordBox
//
this.passwordBox.Location = new System.Drawing.Point(160, 176);
this.passwordBox.Name = "passwordBox";
this.passwordBox.PasswordChar = "$";
this.passwordBox.Size = new System.Drawing.Size(232, 20);
this.passwordBox.TabIndex = 5;
this.passwordBox.Text = "COM seems so old fashion";
//
// btnGetMultiLineText
//
this.btnGetMultiLineText.Location = new System.Drawing.Point(13, 72);
this.btnGetMultiLineText.Name = "btnGetMultiLineText";
this.btnGetMultiLineText.Size = new System.Drawing.Size(120, 32);
this.btnGetMultiLineText.TabIndex = 2;
this.btnGetMultiLineText.Text = "Get Text";
this.btnGetMultiLineText.Click += new System.EventHandler(this.btnGetMultiLineText_Click);
//
// btnPasswordDecoderRing
//
this.btnPasswordDecoderRing.Location = new System.Drawing.Point(280, 144);
this.btnPasswordDecoderRing.Name = "btnPasswordDecoderRing";
this.btnPasswordDecoderRing.Size = new System.Drawing.Size(112, 24);
this.btnPasswordDecoderRing.TabIndex = 7;
this.btnPasswordDecoderRing.Text = "Decode Password";
this.btnPasswordDecoderRing.Click += new System.EventHandler(this.btnPasswordDecoderRing_Click);
//
// label3
//
this.label3.Font = new System.Drawing.Font("Comic Sans MS", 12F);
this.label3.Location = new System.Drawing.Point(152, 144);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(120, 24);
this.label3.TabIndex = 6;
this.label3.Text = "Password Box";
//
// TextBoxMultiline
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(408, 221);
this.Controls.Add(this.btnPasswordDecoderRing);
this.Controls.Add(this.label3);
this.Controls.Add(this.passwordBox);
this.Controls.Add(this.label2);
this.Controls.Add(this.capsOnlyBox);
this.Controls.Add(this.btnGetMultiLineText);
this.Controls.Add(this.label1);
this.Controls.Add(this.multiLineBox);
this.Name = "TextBoxMultiline";
this.Text = "TextBox Types";
this.ResumeLayout(false);
}
protected void btnPasswordDecoderRing_Click (object sender, System.EventArgs e)
{
MessageBox.Show(passwordBox.Text, "Your password is:");
}
protected void btnGetMultiLineText_Click (object sender, System.EventArgs e)
{
MessageBox.Show(multiLineBox.Text, "Here is your text");
}
public static void Main(string[] args)
{
Application.Run(new TextBoxMultiline());
}
}</source>
Simple Editor
<source lang="csharp">using System; using System.Drawing; using System.Drawing.Printing; using System.IO; using System.Windows.Forms;
public class SimpleEditorForm : Form
{
private string fileName = "Untitled";
private string[] lines;
private int linesPrinted;
public SimpleEditorForm()
{
InitializeComponent();
if (fileName != null)
{
this.fileName = "fileName";
OpenFile();
}
}
private void OpenFile()
{
try
{
textBoxEdit.Clear();
textBoxEdit.Text = File.ReadAllText(fileName);
}
catch (IOException ex)
{
MessageBox.Show(ex.Message, "Simple Editor",
MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
private void OnFileNew(object sender, EventArgs e)
{
fileName = "Untitled";
SetFormTitle();
textBoxEdit.Clear();
}
private void OnFileOpen(object sender, EventArgs e)
{
if (dlgOpenFile.ShowDialog() == DialogResult.OK)
{
fileName = dlgOpenFile.FileName;
SetFormTitle();
OpenFile();
}
}
private void SaveFile()
{
try
{
File.WriteAllText(fileName, textBoxEdit.Text);
}
catch (IOException ex)
{
MessageBox.Show(ex.Message, "Simple Editor",MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
private void OnFileSave(object sender, EventArgs e)
{
if (fileName == "Untitled")
{
OnFileSaveAs(sender, e);
}
else
{
SaveFile();
}
}
private void SetFormTitle()
{
FileInfo fileInfo = new FileInfo(fileName);
Text = fileInfo.Name + " - Simple Editor";
}
private void OnFileSaveAs(object sender, EventArgs e)
{
if (dlgSaveFile.ShowDialog() == DialogResult.OK)
{
fileName = dlgSaveFile.FileName;
SetFormTitle();
SaveFile();
}
}
private void OnPrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
int x = e.MarginBounds.Left;
int y = e.MarginBounds.Top;
while (linesPrinted < lines.Length)
{
e.Graphics.DrawString(lines[linesPrinted++],new Font("Arial", 10), Brushes.Black, x, y);
y += 25;
if (y >= e.MarginBounds.Bottom)
{
e.HasMorePages = true;
return;
}
}
linesPrinted = 0;
e.HasMorePages = false;
}
private void OnFilePrint(object sender, EventArgs e)
{
try
{
if (textBoxEdit.SelectedText != "")
{
dlgPrint.AllowSelection = true;
}
if (dlgPrint.ShowDialog() == DialogResult.OK)
{
printDocument.Print();
}
}
catch (InvalidPrinterException ex)
{
MessageBox.Show(ex.Message, "Simple Editor",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void OnBeginPrint(object sender, PrintEventArgs e)
{
char[] param = { "\n" };
if (dlgPrint.PrinterSettings.PrintRange == PrintRange.Selection)
{
lines = textBoxEdit.SelectedText.Split(param);
}
else
{
lines = textBoxEdit.Text.Split(param);
}
int i = 0;
char[] trimParam = { "\r" };
foreach (string s in lines)
{
lines[i++] = s.TrimEnd(trimParam);
}
}
private void OnEndPrint(object sender, PrintEventArgs e)
{
lines = null;
}
private void OnFilePageSetup(object sender, EventArgs e)
{
dlgPageSetup.ShowDialog();
}
private void OnFilePrintPreview(object sender, EventArgs e)
{
dlgPrintPreview.ShowDialog();
}
private void InitializeComponent()
{
this.textBoxEdit = new System.Windows.Forms.TextBox();
this.mainMenu = new System.Windows.Forms.MenuStrip();
this.fileToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.newToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.openToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.saveToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.saveAsToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.dlgOpenFile = new System.Windows.Forms.OpenFileDialog();
this.dlgSaveFile = new System.Windows.Forms.SaveFileDialog();
this.toolStripSeparator1 = new System.Windows.Forms.ToolStripSeparator();
this.printToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.printPreviewToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.pageSetupToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.toolStripSeparator2 = new System.Windows.Forms.ToolStripSeparator();
this.exitToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
this.printDocument = new System.Drawing.Printing.PrintDocument();
this.dlgPageSetup = new System.Windows.Forms.PageSetupDialog();
this.dlgPrint = new System.Windows.Forms.PrintDialog();
this.dlgPrintPreview = new System.Windows.Forms.PrintPreviewDialog();
this.printPreviewControl = new System.Windows.Forms.PrintPreviewControl();
this.mainMenu.SuspendLayout();
this.SuspendLayout();
this.textBoxEdit.AcceptsReturn = true;
this.textBoxEdit.AcceptsTab = true;
this.textBoxEdit.Dock = System.Windows.Forms.DockStyle.Fill;
this.textBoxEdit.Location = new System.Drawing.Point(0, 24);
this.textBoxEdit.Multiline = true;
this.textBoxEdit.Name = "textBoxEdit";
this.textBoxEdit.ScrollBars = System.Windows.Forms.ScrollBars.Both;
this.textBoxEdit.Size = new System.Drawing.Size(546, 203);
this.mainMenu.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {this.fileToolStripMenuItem});
this.mainMenu.Location = new System.Drawing.Point(0, 0);
this.mainMenu.Size = new System.Drawing.Size(546, 24);
this.mainMenu.Text = "menuStrip1";
this.fileToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
this.newToolStripMenuItem,
this.openToolStripMenuItem,
this.saveToolStripMenuItem,
this.saveAsToolStripMenuItem,
this.toolStripSeparator1,
this.printToolStripMenuItem,
this.printPreviewToolStripMenuItem,
this.pageSetupToolStripMenuItem,
this.toolStripSeparator2,
this.exitToolStripMenuItem});
this.fileToolStripMenuItem.Size = new System.Drawing.Size(38, 20);
this.fileToolStripMenuItem.Text = "&File";
//
this.newToolStripMenuItem.Size = new System.Drawing.Size(159, 22);
this.newToolStripMenuItem.Text = "&New";
this.newToolStripMenuItem.Click += new System.EventHandler(this.OnFileNew);
//
this.openToolStripMenuItem.Size = new System.Drawing.Size(159, 22);
this.openToolStripMenuItem.Text = "&Open...";
this.openToolStripMenuItem.Click += new System.EventHandler(this.OnFileOpen);
//
this.saveToolStripMenuItem.Size = new System.Drawing.Size(159, 22);
this.saveToolStripMenuItem.Text = "&Save";
this.saveToolStripMenuItem.Click += new System.EventHandler(this.OnFileSave);
//
this.saveAsToolStripMenuItem.Size = new System.Drawing.Size(159, 22);
this.saveAsToolStripMenuItem.Text = "Save &As...";
this.saveAsToolStripMenuItem.Click += new System.EventHandler(this.OnFileSaveAs);
//
// dlgOpenFile
//
this.dlgOpenFile.Filter = "Text Documents (*.txt)|*.txt|Wrox Documents (*.wroxtext)|*.wroxtext|All Files|*.*";
//
// dlgSaveFile
//
this.dlgSaveFile.FileName = "Untitled";
this.dlgSaveFile.Filter = "Text Document (*.txt)|*.txt|Wrox Document (*.wroxtext)|*.wroxtext";
this.dlgSaveFile.FilterIndex = 2;
//
this.toolStripSeparator1.Size = new System.Drawing.Size(156, 6);
//
this.printToolStripMenuItem.Size = new System.Drawing.Size(159, 22);
this.printToolStripMenuItem.Text = "&Print...";
this.printToolStripMenuItem.Click += new System.EventHandler(this.OnFilePrint);
//
// printPreviewToolStripMenuItem
//
this.printPreviewToolStripMenuItem.Name = "printPreviewToolStripMenuItem";
this.printPreviewToolStripMenuItem.Size = new System.Drawing.Size(159, 22);
this.printPreviewToolStripMenuItem.Text = "Print Pre&view...";
this.printPreviewToolStripMenuItem.Click += new System.EventHandler(this.OnFilePrintPreview);
//
// pageSetupToolStripMenuItem
//
this.pageSetupToolStripMenuItem.Name = "pageSetupToolStripMenuItem";
this.pageSetupToolStripMenuItem.Size = new System.Drawing.Size(159, 22);
this.pageSetupToolStripMenuItem.Text = "Page Set&up...";
this.pageSetupToolStripMenuItem.Click += new System.EventHandler(this.OnFilePageSetup);
//
// toolStripSeparator2
//
this.toolStripSeparator2.Name = "toolStripSeparator2";
this.toolStripSeparator2.Size = new System.Drawing.Size(156, 6);
//
// exitToolStripMenuItem
//
this.exitToolStripMenuItem.Name = "exitToolStripMenuItem";
this.exitToolStripMenuItem.Size = new System.Drawing.Size(159, 22);
this.exitToolStripMenuItem.Text = "E&xit";
//
// printDocument
//
this.printDocument.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.OnPrintPage);
this.printDocument.EndPrint += new System.Drawing.Printing.PrintEventHandler(this.OnEndPrint);
this.printDocument.BeginPrint += new System.Drawing.Printing.PrintEventHandler(this.OnBeginPrint);
//
// dlgPageSetup
//
this.dlgPageSetup.Document = this.printDocument;
this.dlgPageSetup.ShowHelp = true;
//
// dlgPrint
//
this.dlgPrint.Document = this.printDocument;
this.dlgPrint.UseEXDialog = true;
//
// dlgPrintPreview
//
this.dlgPrintPreview.AutoScrollMargin = new System.Drawing.Size(0, 0);
this.dlgPrintPreview.AutoScrollMinSize = new System.Drawing.Size(0, 0);
this.dlgPrintPreview.ClientSize = new System.Drawing.Size(400, 300);
this.dlgPrintPreview.Document = this.printDocument;
this.dlgPrintPreview.Enabled = true;
this.dlgPrintPreview.Name = "dlgPrintPreview";
this.dlgPrintPreview.Visible = false;
//
// printPreviewControl
//
this.printPreviewControl.Dock = System.Windows.Forms.DockStyle.Fill;
this.printPreviewControl.Document = this.printDocument;
this.printPreviewControl.Location = new System.Drawing.Point(0, 24);
this.printPreviewControl.Name = "printPreviewControl";
this.printPreviewControl.Size = new System.Drawing.Size(546, 203);
this.printPreviewControl.TabIndex = 2;
this.printPreviewControl.Visible = false;
//
// SimpleEditorForm
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(546, 227);
this.Controls.Add(this.printPreviewControl);
this.Controls.Add(this.textBoxEdit);
this.Controls.Add(this.mainMenu);
this.MainMenuStrip = this.mainMenu;
this.Name = "SimpleEditorForm";
this.Text = "Simple Editor";
this.mainMenu.ResumeLayout(false);
this.mainMenu.PerformLayout();
this.ResumeLayout(false);
this.PerformLayout();
}
private System.Windows.Forms.TextBox textBoxEdit;
private System.Windows.Forms.MenuStrip mainMenu;
private System.Windows.Forms.ToolStripMenuItem fileToolStripMenuItem;
private System.Windows.Forms.ToolStripMenuItem newToolStripMenuItem;
private System.Windows.Forms.ToolStripMenuItem openToolStripMenuItem;
private System.Windows.Forms.ToolStripMenuItem saveToolStripMenuItem;
private System.Windows.Forms.ToolStripMenuItem saveAsToolStripMenuItem;
private System.Windows.Forms.OpenFileDialog dlgOpenFile;
private System.Windows.Forms.SaveFileDialog dlgSaveFile;
private System.Windows.Forms.ToolStripSeparator toolStripSeparator1;
private System.Windows.Forms.ToolStripMenuItem printToolStripMenuItem;
private System.Windows.Forms.ToolStripMenuItem printPreviewToolStripMenuItem;
private System.Windows.Forms.ToolStripMenuItem pageSetupToolStripMenuItem;
private System.Windows.Forms.ToolStripSeparator toolStripSeparator2;
private System.Windows.Forms.ToolStripMenuItem exitToolStripMenuItem;
private System.Drawing.Printing.PrintDocument printDocument;
private System.Windows.Forms.PageSetupDialog dlgPageSetup;
private System.Windows.Forms.PrintDialog dlgPrint;
private System.Windows.Forms.PrintPreviewDialog dlgPrintPreview;
private System.Windows.Forms.PrintPreviewControl printPreviewControl;
[STAThread]
static void Main(string[] args)
{
Application.Run(new SimpleEditorForm());
}
}</source>
TextBox cancel event
<source lang="csharp">using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class TextCancelEventKeyEvent : System.Windows.Forms.Form {
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox txtInput;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label lblTrue;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Label lblCheck;
private System.Windows.Forms.Label lblResults;
public TextCancelEventKeyEvent()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.txtInput = new System.Windows.Forms.TextBox();
this.label2 = new System.Windows.Forms.Label();
this.lblTrue = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.lblCheck = new System.Windows.Forms.Label();
this.lblResults = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// label1
//
this.label1.Font = new System.Drawing.Font("Tahoma", 14.25F, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic), System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.label1.Location = new System.Drawing.Point(48, 16);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(176, 23);
this.label1.TabIndex = 0;
this.label1.Text = "ISBN Validation";
//
// txtInput
//
this.txtInput.Location = new System.Drawing.Point(72, 64);
this.txtInput.Name = "txtInput";
this.txtInput.TabIndex = 1;
this.txtInput.Text = "";
this.txtInput.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txtInput_KeyPress);
this.txtInput.Validating += new System.ruponentModel.CancelEventHandler(this.handleCancleEvent);
//
// label2
//
this.label2.Location = new System.Drawing.Point(24, 104);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(80, 23);
this.label2.TabIndex = 2;
this.label2.Text = "True Number:";
//
// lblTrue
//
this.lblTrue.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lblTrue.Location = new System.Drawing.Point(112, 104);
this.lblTrue.Name = "lblTrue";
this.lblTrue.TabIndex = 3;
//
// label3
//
this.label3.Location = new System.Drawing.Point(32, 152);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(72, 23);
this.label3.TabIndex = 4;
this.label3.Text = "Check Digit:";
//
// lblCheck
//
this.lblCheck.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lblCheck.Location = new System.Drawing.Point(112, 152);
this.lblCheck.Name = "lblCheck";
this.lblCheck.TabIndex = 5;
//
// lblResults
//
this.lblResults.Location = new System.Drawing.Point(56, 192);
this.lblResults.Name = "lblResults";
this.lblResults.Size = new System.Drawing.Size(152, 24);
this.lblResults.TabIndex = 8;
//
// TextCancelEventKeyEvent
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(264, 293);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.lblResults,
this.lblCheck,
this.label3,
this.lblTrue,
this.label2,
this.txtInput,
this.label1});
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new TextCancelEventKeyEvent());
}
private void handleCancleEvent(object sender, System.ruponentModel.CancelEventArgs e)
{
TextBox tb = (TextBox)sender;
string strInput = tb.Text;
Console.WriteLine(strInput);
}
private void txtInput_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
char keyChar;
keyChar = e.KeyChar;
if(!Char.IsDigit(keyChar) // 0 - 9
&&
keyChar != 8 // backspace
&&
keyChar != 13 // enter
&&
keyChar != "x"
&&
keyChar != 45 // dash/minus
){
// Do not display the keystroke
e.Handled = true;
}
}
}</source>
TextBox Keyevent hander
<source lang="csharp">using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class TextCancelEventKeyEvent : System.Windows.Forms.Form {
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox txtInput;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label lblTrue;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Label lblCheck;
private System.Windows.Forms.Label lblResults;
public TextCancelEventKeyEvent()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.txtInput = new System.Windows.Forms.TextBox();
this.label2 = new System.Windows.Forms.Label();
this.lblTrue = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.lblCheck = new System.Windows.Forms.Label();
this.lblResults = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// label1
//
this.label1.Font = new System.Drawing.Font("Tahoma", 14.25F, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic), System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.label1.Location = new System.Drawing.Point(48, 16);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(176, 23);
this.label1.TabIndex = 0;
this.label1.Text = "ISBN Validation";
//
// txtInput
//
this.txtInput.Location = new System.Drawing.Point(72, 64);
this.txtInput.Name = "txtInput";
this.txtInput.TabIndex = 1;
this.txtInput.Text = "";
this.txtInput.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txtInput_KeyPress);
this.txtInput.Validating += new System.ruponentModel.CancelEventHandler(this.handleCancleEvent);
//
// label2
//
this.label2.Location = new System.Drawing.Point(24, 104);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(80, 23);
this.label2.TabIndex = 2;
this.label2.Text = "True Number:";
//
// lblTrue
//
this.lblTrue.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lblTrue.Location = new System.Drawing.Point(112, 104);
this.lblTrue.Name = "lblTrue";
this.lblTrue.TabIndex = 3;
//
// label3
//
this.label3.Location = new System.Drawing.Point(32, 152);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(72, 23);
this.label3.TabIndex = 4;
this.label3.Text = "Check Digit:";
//
// lblCheck
//
this.lblCheck.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.lblCheck.Location = new System.Drawing.Point(112, 152);
this.lblCheck.Name = "lblCheck";
this.lblCheck.TabIndex = 5;
//
// lblResults
//
this.lblResults.Location = new System.Drawing.Point(56, 192);
this.lblResults.Name = "lblResults";
this.lblResults.Size = new System.Drawing.Size(152, 24);
this.lblResults.TabIndex = 8;
//
// TextCancelEventKeyEvent
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(264, 293);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.lblResults,
this.lblCheck,
this.label3,
this.lblTrue,
this.label2,
this.txtInput,
this.label1});
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new TextCancelEventKeyEvent());
}
private void handleCancleEvent(object sender, System.ruponentModel.CancelEventArgs e)
{
TextBox tb = (TextBox)sender;
string strInput = tb.Text;
Console.WriteLine(strInput);
}
private void txtInput_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
char keyChar;
keyChar = e.KeyChar;
if(!Char.IsDigit(keyChar) // 0 - 9
&&
keyChar != 8 // backspace
&&
keyChar != 13 // enter
&&
keyChar != "x"
&&
keyChar != 45 // dash/minus
){
// Do not display the keystroke
e.Handled = true;
}
}
}</source>
TextBox key pressed event
<source lang="csharp">using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Windows.Forms; class Form1 : Form {
public Form1() {
InitializeComponent();
this.buttonOK.Enabled = false;
this.textBoxAddress.Tag = false;
this.textBoxAge.Tag = false;
this.textBoxName.Tag = false;
this.textBoxName.Validating += new System.ruponentModel.CancelEventHandler(this.textBoxEmpty_Validating);
this.textBoxAddress.Validating += new
System.ruponentModel.CancelEventHandler(this.textBoxEmpty_Validating);
this.textBoxAge.Validating += new
System.ruponentModel.CancelEventHandler(this.textBoxEmpty_Validating);
this.textBoxName.TextChanged += new System.EventHandler(this.textBox_TextChanged);
this.textBoxAddress.TextChanged += new
System.EventHandler(this.textBox_TextChanged);
this.textBoxAge.TextChanged += new System.EventHandler(this.textBox_TextChanged);
}
private void buttonOK_Click(object sender, EventArgs e) {
this.textBoxOutput.Text = "clicked";
}
private void buttonHelp_Click(object sender, EventArgs e) {
this.textBoxOutput.Text = "text";
}
private void textBoxEmpty_Validating(object sender,
System.ruponentModel.CancelEventArgs e) {
TextBox tb = (TextBox)sender;
if (tb.Text.Length == 0) {
tb.BackColor = Color.Red;
tb.Tag = false;
} else {
tb.BackColor = System.Drawing.SystemColors.Window;
tb.Tag = true;
}
ValidateOK();
}
private void textBoxAge_KeyPress(object sender, KeyPressEventArgs e) {
if ((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8)
e.Handled = true; // Remove the character
}
private void textBox_TextChanged(object sender, System.EventArgs e) {
TextBox tb = (TextBox)sender;
if (tb.Text.Length == 0) {
tb.Tag = false;
tb.BackColor = Color.Red;
} else {
tb.Tag = true;
tb.BackColor = SystemColors.Window;
}
ValidateOK();
}
private void ValidateOK() {
this.buttonOK.Enabled = ((bool)(this.textBoxAddress.Tag) &&
(bool)(this.textBoxAge.Tag) &&
(bool)(this.textBoxName.Tag));
}
private void InitializeComponent() {
this.labelName = new System.Windows.Forms.Label();
this.labelAddress = new System.Windows.Forms.Label();
this.textBoxName = new System.Windows.Forms.TextBox();
this.textBoxAddress = new System.Windows.Forms.TextBox();
this.labelOutput = new System.Windows.Forms.Label();
this.buttonOK = new System.Windows.Forms.Button();
this.buttonHelp = new System.Windows.Forms.Button();
this.labelAge = new System.Windows.Forms.Label();
this.textBoxAge = new System.Windows.Forms.TextBox();
this.groupBox1 = new System.Windows.Forms.GroupBox();
this.radioButtonMale = new System.Windows.Forms.RadioButton();
this.radioButtonFemale = new System.Windows.Forms.RadioButton();
this.checkBoxProgrammer = new System.Windows.Forms.CheckBox();
this.textBoxOutput = new System.Windows.Forms.TextBox();
this.groupBox1.SuspendLayout();
this.SuspendLayout();
this.labelName.AutoSize = true;
this.labelName.Location = new System.Drawing.Point(13, 16);
this.labelName.Name = "labelName";
this.labelName.Size = new System.Drawing.Size(34, 14);
this.labelName.TabIndex = 0;
this.labelName.Text = "Name";
this.labelAddress.AutoSize = true;
this.labelAddress.Location = new System.Drawing.Point(13, 43);
this.labelAddress.Name = "labelAddress";
this.labelAddress.Size = new System.Drawing.Size(46, 14);
this.labelAddress.TabIndex = 1;
this.labelAddress.Text = "Address";
this.textBoxName.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.textBoxName.Location = new System.Drawing.Point(106, 13);
this.textBoxName.Name = "textBoxName";
this.textBoxName.Size = new System.Drawing.Size(225, 20);
this.textBoxName.TabIndex = 2;
this.textBoxAddress.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.textBoxAddress.AutoSize = false;
this.textBoxAddress.Location = new System.Drawing.Point(106, 40);
this.textBoxAddress.Multiline = true;
this.textBoxAddress.Name = "textBoxAddress";
this.textBoxAddress.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
this.textBoxAddress.Size = new System.Drawing.Size(225, 80);
this.textBoxAddress.TabIndex = 3;
this.labelOutput.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.labelOutput.AutoSize = true;
this.labelOutput.Location = new System.Drawing.Point(13, 233);
this.labelOutput.Name = "labelOutput";
this.labelOutput.Size = new System.Drawing.Size(38, 14);
this.labelOutput.TabIndex = 6;
this.labelOutput.Text = "Output";
this.buttonOK.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.buttonOK.Location = new System.Drawing.Point(338, 13);
this.buttonOK.Name = "buttonOK";
this.buttonOK.TabIndex = 8;
this.buttonOK.Text = "OK";
this.buttonOK.Click += new System.EventHandler(this.buttonOK_Click);
this.buttonHelp.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.buttonHelp.CausesValidation = false;
this.buttonHelp.Location = new System.Drawing.Point(338, 43);
this.buttonHelp.Name = "buttonHelp";
this.buttonHelp.TabIndex = 9;
this.buttonHelp.Text = "Help";
this.buttonHelp.Click += new System.EventHandler(this.buttonHelp_Click);
this.labelAge.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.labelAge.AutoSize = true;
this.labelAge.Location = new System.Drawing.Point(13, 212);
this.labelAge.Name = "labelAge";
this.labelAge.Size = new System.Drawing.Size(24, 14);
this.labelAge.TabIndex = 10;
this.labelAge.Text = "Age";
this.textBoxAge.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.textBoxAge.Location = new System.Drawing.Point(106, 209);
this.textBoxAge.MaxLength = 3;
this.textBoxAge.Name = "textBoxAge";
this.textBoxAge.TabIndex = 11;
this.textBoxAge.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBoxAge_KeyPress);
this.groupBox1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.groupBox1.Controls.Add(this.radioButtonMale);
this.groupBox1.Controls.Add(this.radioButtonFemale);
this.groupBox1.Location = new System.Drawing.Point(13, 152);
this.groupBox1.Name = "groupBox1";
this.groupBox1.Size = new System.Drawing.Size(318, 50);
this.groupBox1.TabIndex = 12;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "Sex";
this.radioButtonMale.AutoSize = true;
this.radioButtonMale.Location = new System.Drawing.Point(182, 20);
this.radioButtonMale.Name = "radioButtonMale";
this.radioButtonMale.Size = new System.Drawing.Size(44, 17);
this.radioButtonMale.TabIndex = 1;
this.radioButtonMale.Text = "Male";
this.radioButtonFemale.AutoSize = true;
this.radioButtonFemale.Checked = true;
this.radioButtonFemale.Location = new System.Drawing.Point(44, 20);
this.radioButtonFemale.Name = "radioButtonFemale";
this.radioButtonFemale.Size = new System.Drawing.Size(55, 17);
this.radioButtonFemale.TabIndex = 0;
this.radioButtonFemale.Text = "Female";
this.checkBoxProgrammer.AutoSize = true;
this.checkBoxProgrammer.Checked = true;
this.checkBoxProgrammer.CheckState = System.Windows.Forms.CheckState.Checked;
this.checkBoxProgrammer.Location = new System.Drawing.Point(13, 128);
this.checkBoxProgrammer.Name = "checkBoxProgrammer";
this.checkBoxProgrammer.Size = new System.Drawing.Size(78, 17);
this.checkBoxProgrammer.TabIndex = 13;
this.checkBoxProgrammer.Text = "Programmer";
this.textBoxOutput.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.textBoxOutput.AutoSize = false;
this.textBoxOutput.Location = new System.Drawing.Point(13, 254);
this.textBoxOutput.Multiline = true;
this.textBoxOutput.Name = "textBoxOutput";
this.textBoxOutput.ReadOnly = true;
this.textBoxOutput.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
this.textBoxOutput.Size = new System.Drawing.Size(318, 116);
this.textBoxOutput.TabIndex = 14;
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(422, 382);
this.Controls.Add(this.textBoxOutput);
this.Controls.Add(this.checkBoxProgrammer);
this.Controls.Add(this.groupBox1);
this.Controls.Add(this.textBoxAge);
this.Controls.Add(this.labelAge);
this.Controls.Add(this.buttonHelp);
this.Controls.Add(this.buttonOK);
this.Controls.Add(this.labelOutput);
this.Controls.Add(this.textBoxAddress);
this.Controls.Add(this.textBoxName);
this.Controls.Add(this.labelAddress);
this.Controls.Add(this.labelName);
this.MinimumSize = new System.Drawing.Size(430, 328);
this.groupBox1.ResumeLayout(false);
this.groupBox1.PerformLayout();
this.ResumeLayout(false);
this.PerformLayout();
}
private System.Windows.Forms.Label labelName;
private System.Windows.Forms.Label labelAddress;
private System.Windows.Forms.TextBox textBoxName;
private System.Windows.Forms.TextBox textBoxAddress;
private System.Windows.Forms.Label labelOutput;
private System.Windows.Forms.Button buttonOK;
private System.Windows.Forms.Button buttonHelp;
private System.Windows.Forms.Label labelAge;
private System.Windows.Forms.TextBox textBoxAge;
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.RadioButton radioButtonFemale;
private System.Windows.Forms.RadioButton radioButtonMale;
private System.Windows.Forms.CheckBox checkBoxProgrammer;
private System.Windows.Forms.TextBox textBoxOutput;
[STAThread]
static void Main() {
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}</source>
TextBox Modified and TextChanged
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class TextBoxTextChanged : Form {
TextBox txt;
string strOriginal;
public TextBoxTextChanged()
{
Size = new Size(300, 375);
txt = new TextBox();
txt.Parent = this;
txt.Text = "Enter text here.";
txt.Size = new Size(ClientSize.Width - 20, ClientSize.Height - 100);
txt.Location = new Point(10,10);
txt.TextChanged += new System.EventHandler(txt_TextChanged);
txt.Multiline = true;
txt.BorderStyle = BorderStyle.Fixed3D;
txt.ScrollBars = ScrollBars.Vertical;
txt.Anchor = AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Top | AnchorStyles.Bottom;
strOriginal = txt.Text;
}
static void Main()
{
Application.Run(new TextBoxTextChanged());
}
private void txt_TextChanged(object sender, EventArgs e)
{
if (strOriginal == txt.Text)
txt.Modified = false;
else
txt.Modified = true;
if (txt.Modified)
MessageBox.Show("changed");
else
MessageBox.Show("no change");
}
}</source>
TextBox: Multiline and BorderStyle
<source lang="csharp">using System; using System.Drawing; using System.Windows.Forms; public class TextBoxTextChanged : Form {
TextBox txt;
string strOriginal;
public TextBoxTextChanged()
{
Size = new Size(300, 375);
txt = new TextBox();
txt.Parent = this;
txt.Text = "Enter text here.";
txt.Size = new Size(ClientSize.Width - 20, ClientSize.Height - 100);
txt.Location = new Point(10,10);
txt.Multiline = true;
txt.BorderStyle = BorderStyle.Fixed3D;
txt.ScrollBars = ScrollBars.Vertical;
txt.Anchor = AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Top | AnchorStyles.Bottom;
strOriginal = txt.Text;
}
static void Main()
{
Application.Run(new TextBoxTextChanged());
}
}</source>
TextBox selection
<source lang="csharp">using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Windows.Forms; partial class Form1 : Form {
public Form1()
{
InitializeComponent();
}
private void showButton_Click(object sender, EventArgs e)
{
if (inputBox.SelectionLength == 0)
{
MessageBox.Show("You need to select something inside the text box first");
}
else
{
System.Text.StringBuilder builder = new System.Text.StringBuilder();
builder.Append(String.Format("The input box contains {0}\n", inputBox.Text));
builder.Append(String.Format("You have selected {0} characters, starting at {1}\n", inputBox.SelectionLength, inputBox.SelectionStart));
builder.Append(String.Format("The selection is {0}", inputBox.SelectedText));
MessageBox.Show(builder.ToString());
}
}
} partial class Form1 {
private void InitializeComponent()
{
this.inputBox = new System.Windows.Forms.TextBox();
this.showButton = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// inputBox
//
this.inputBox.Location = new System.Drawing.Point(16, 15);
this.inputBox.Name = "inputBox";
this.inputBox.Size = new System.Drawing.Size(421, 22);
this.inputBox.TabIndex = 0;
//
// showButton
//
this.showButton.Location = new System.Drawing.Point(311, 46);
this.showButton.Name = "showButton";
this.showButton.Size = new System.Drawing.Size(126, 27);
this.showButton.TabIndex = 1;
this.showButton.Text = "Show selection";
this.showButton.Click += new System.EventHandler(this.showButton_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
this.ClientSize = new System.Drawing.Size(449, 87);
this.Controls.Add(this.showButton);
this.Controls.Add(this.inputBox);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.PerformLayout();
}
private System.Windows.Forms.TextBox inputBox;
private System.Windows.Forms.Button showButton;
} public class TextBoxSelection {
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}</source>
TextBox validation
<source lang="csharp">using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public partial class Form1 : Form {
public Form1()
{
InitializeComponent();
}
private void numberBox_Validating(object sender, CancelEventArgs e)
{
try
{
int numberEntered = int.Parse(numberBox.Text);
if (numberEntered < 1 || numberEntered > 10)
{
e.Cancel = true;
MessageBox.Show("You have to enter a number between 1 and 10");
}
}
catch (FormatException)
{
e.Cancel = true;
MessageBox.Show("You need to enter an integer");
}
}
private void numberBox_Validated(object sender, EventArgs e)
{
MessageBox.Show("Well done, you managed to enter a valid number");
}
private void okButton_Click(object sender, EventArgs e)
{
this.Close();
}
} partial class Form1 {
private void InitializeComponent()
{
this.numberBox = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.okButton = new System.Windows.Forms.Button();
this.maskedTextBox1 = new System.Windows.Forms.MaskedTextBox();
this.SuspendLayout();
//
// numberBox
//
this.numberBox.Location = new System.Drawing.Point(253, 15);
this.numberBox.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
this.numberBox.Name = "numberBox";
this.numberBox.Size = new System.Drawing.Size(57, 22);
this.numberBox.TabIndex = 0;
this.numberBox.Validated += new System.EventHandler(this.numberBox_Validated);
this.numberBox.Validating += new System.ruponentModel.CancelEventHandler(this.numberBox_Validating);
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(16, 18);
this.label1.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(201, 16);
this.label1.TabIndex = 1;
this.label1.Text = "Enter a number between 1 and 10";
//
// okButton
//
this.okButton.Location = new System.Drawing.Point(335, 11);
this.okButton.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
this.okButton.Name = "okButton";
this.okButton.Size = new System.Drawing.Size(100, 28);
this.okButton.TabIndex = 2;
this.okButton.Text = "OK";
this.okButton.Click += new System.EventHandler(this.okButton_Click);
//
// maskedTextBox1
//
this.maskedTextBox1.Location = new System.Drawing.Point(0, 0);
this.maskedTextBox1.Name = "maskedTextBox1";
this.maskedTextBox1.Size = new System.Drawing.Size(100, 23);
this.maskedTextBox1.TabIndex = 3;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(453, 246);
this.Controls.Add(this.maskedTextBox1);
this.Controls.Add(this.okButton);
this.Controls.Add(this.label1);
this.Controls.Add(this.numberBox);
this.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.PerformLayout();
}
private System.Windows.Forms.TextBox numberBox;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Button okButton;
private System.Windows.Forms.MaskedTextBox maskedTextBox1;
} public class TextBoxValidation {
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}</source>
Use Regular Expression to Check the input for a TextBox
<source lang="csharp">using System; using System.Windows.Forms; using System.Text.RegularExpressions; public class TextBoxValidationRegex : Form {
public TextBoxValidationRegex()
{
this.ruponents = new System.ruponentModel.Container();
this.Button1 = new System.Windows.Forms.Button();
this.errProvider = new System.Windows.Forms.ErrorProvider(this.ruponents);
this.Label3 = new System.Windows.Forms.Label();
this.txtEmail = new System.Windows.Forms.TextBox();
((System.ruponentModel.ISupportInitialize)(this.errProvider)).BeginInit();
this.SuspendLayout();
this.Button1.Location = new System.Drawing.Point(212, 80);
this.Button1.Name = "Button1";
this.Button1.Size = new System.Drawing.Size(76, 24);
this.Button1.TabIndex = 12;
this.Button1.Text = "OK";
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.errProvider.ContainerControl = this;
this.errProvider.DataMember = "";
this.Label3.Location = new System.Drawing.Point(24, 24);
this.Label3.Size = new System.Drawing.Size(40, 16);
this.Label3.Text = "Email:";
this.txtEmail.Location = new System.Drawing.Point(68, 20);
this.txtEmail.Size = new System.Drawing.Size(220, 21);
this.txtEmail.Leave += new System.EventHandler(this.txtEmail_Leave);
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(328, 126);
this.Controls.Add(this.Label3);
this.Controls.Add(this.txtEmail);
this.Controls.Add(this.Button1);
this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
((System.ruponentModel.ISupportInitialize)(this.errProvider)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
private void Button1_Click(object sender, EventArgs e)
{
string errorText = "";
foreach (Control ctrl in this.Controls)
{
if (errProvider.GetError(ctrl) != "")
{
errorText += " * " + errProvider.GetError(ctrl) + "\n";
}
MessageBox.Show("Errors:" +errorText, "Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
private void txtEmail_Leave(object sender, EventArgs e)
{
Regex regex;
regex = new Regex(@"^[\w-]+@([\w-]+\.)+[\w-]+$");
Control ctrl = (Control)sender;
if (regex.IsMatch(ctrl.Text) || ctrl.Text == "")
{
errProvider.SetError(ctrl, "");
}
else
{
errProvider.SetError(ctrl, "This is not a valid email address.");
}
}
[STAThread]
public static void Main(string[] args)
{
Application.Run(new TextBoxValidationRegex());
}
private System.Windows.Forms.Button Button1;
private System.Windows.Forms.ErrorProvider errProvider;
private System.Windows.Forms.Label Label3;
private System.Windows.Forms.TextBox txtEmail;
private System.ruponentModel.IContainer components = null;
}</source>
