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>