ASP.Net/Request/Query String

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Deal with the query string (VB.net)

   <source lang="csharp">

<%@ Page Language=VB Debug=true %> <script runat=server> Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)

   If Len(Request.QueryString("StoreID")) = 0 _
       or Len(Request.QueryString("ProductID")) = 0 Then
       lblMessage1.Text = "One or both of the fields " _
           & "StoreID or ProductID were not found in the " _
           & "QueryString collection!"
   Else
       lblMessage1.Text = "Store ID: " _
           & Request.QueryString("StoreID")
       lblMessage2.Text = "Product ID: " _
           & Request.QueryString("ProductID")
   End If

End Sub </SCRIPT> <HTML> <HEAD> <TITLE>QueryString Sample Page</TITLE> </HEAD> <BODY > <form runat="server"> <asp:Label

   id="lblMessage1"
   runat="Server"
   Font-Bold="True"

/>

<asp:Label

   id="lblMessage2"
   runat="Server"
   Font-Bold="True"

/> </Form> </BODY> </HTML>

      </source>
   
  


Get query string from Request (C#)

   <source lang="csharp">

<%@ Page language="c#" src="QueryStringRecipient.aspx.cs" AutoEventWireup="false" Inherits="QueryStringRecipient" %> <HTML>

 <body>
   <form id="Form1" method="post" runat="server">
     <asp:Label id="lblInfo" style="Z-INDEX: 101; LEFT: 26px; POSITION: absolute; TOP: 25px" runat="server" Width="412px" Height="130px" BorderStyle="Groove" BorderWidth="2px" Font-Bold="True" Font-Names="Verdana" Font-Size="Medium" BackColor="LightYellow"></asp:Label> 
   </form>
 </body>

</HTML>

<%-- using System; using System.Collections; using System.ruponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls;

 public class QueryStringRecipient : System.Web.UI.Page
 {
   protected System.Web.UI.WebControls.Label lblInfo;
 
   private void Page_Load(object sender, System.EventArgs e)
   {
     lblInfo.Text = "Item: " + Request.QueryString["Item"];
     lblInfo.Text += "
Show Full Record: "; lblInfo.Text += Request.QueryString["Mode"]; } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load); } #endregion }

--%>

      </source>
   
  


Send and get query string (C#)

   <source lang="csharp">

<%@ Page language="c#" src="QueryStringSender.aspx.cs" AutoEventWireup="false" Inherits="QueryStringSender" %> <HTML>

 <body>
   <form id="Form1" method="post" runat="server">
     <asp:ListBox id="lstItems" style="Z-INDEX: 101; LEFT: 21px; POSITION: absolute; TOP: 26px" runat="server" Width="204px" Height="188px"></asp:ListBox>
     <asp:CheckBox id="chkDetails" style="Z-INDEX: 102; LEFT: 24px; POSITION: absolute; TOP: 224px" runat="server" Width="216px" Height="16px" Text="Show Full Details"></asp:CheckBox>
     <asp:Button id="cmdGo" style="Z-INDEX: 103; LEFT: 24px; POSITION: absolute; TOP: 272px" runat="server" Width="152px" Text="View Information"></asp:Button>
     <asp:Label id="lblError" style="Z-INDEX: 104; LEFT: 304px; POSITION: absolute; TOP: 64px" runat="server" Width="312px" Height="96px"></asp:Label>
   </form>
 </body>

</HTML>

<%-- using System; using System.Collections; using System.ruponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls;

 public class QueryStringSender : System.Web.UI.Page
 {
   protected System.Web.UI.WebControls.ListBox lstItems;
   protected System.Web.UI.WebControls.CheckBox chkDetails;
   protected System.Web.UI.WebControls.Button cmdGo;
   protected System.Web.UI.WebControls.Label lblError;
 
   private void Page_Load(object sender, System.EventArgs e)
   {
     // Add sample values.
     lstItems.Items.Add("A");
     lstItems.Items.Add("B");
   }
   #region Web Form Designer generated code
   override protected void OnInit(EventArgs e)
   {
     //
     // CODEGEN: This call is required by the ASP.NET Web Form Designer.
     //
     InitializeComponent();
     base.OnInit(e);
   }
   
   /// <summary>
   /// Required method for Designer support - do not modify
   /// the contents of this method with the code editor.
   /// </summary>
   private void InitializeComponent()
   {    
     this.cmdGo.Click += new System.EventHandler(this.cmdGo_Click);
     this.Load += new System.EventHandler(this.Page_Load);
   }
   #endregion
   private void cmdGo_Click(object sender, System.EventArgs e)
   {
     if (lstItems.SelectedIndex == -1)
     {
       lblError.Text = "You must select an item.";
     }
     else
     {
       string url = "QueryStringRecipient.aspx?";
       url += "Item=" + lstItems.SelectedItem.Text + "&";
       url += "Mode=" + chkDetails.Checked.ToString();
       Response.Redirect(url);
     }
   }
 }

--%>



<%-- QueryStringRecipient.aspx <%@ Page language="c#" src="QueryStringRecipient.aspx.cs" AutoEventWireup="false" Inherits="QueryStringRecipient" %> <HTML>

 <body>
   <form id="Form1" method="post" runat="server">
     <asp:Label id="lblInfo" style="Z-INDEX: 101; LEFT: 26px; POSITION: absolute; TOP: 25px" runat="server" Width="412px" Height="130px" BorderStyle="Groove" BorderWidth="2px" Font-Bold="True" Font-Names="Verdana" Font-Size="Medium" BackColor="LightYellow"></asp:Label> 
   </form>
 </body>

</HTML>

//File: QueryStringRecipient.aspx.cs using System; using System.Collections; using System.ruponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls;

 public class QueryStringRecipient : System.Web.UI.Page
 {
   protected System.Web.UI.WebControls.Label lblInfo;
 
   private void Page_Load(object sender, System.EventArgs e)
   {
     lblInfo.Text = "Item: " + Request.QueryString["Item"];
     lblInfo.Text += "
Show Full Record: "; lblInfo.Text += Request.QueryString["Mode"]; } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load); } #endregion }

--%>

      </source>
   
  


Showing QueryString values via the QueryString Collection in ASP.NET

   <source lang="csharp">

<%@ Page Language="vb" %> <html>

  <head>
     <title>Showing QueryString values via the QueryString Collection in ASP.NET</title>
  </head>

<body>

<% Dim Counter1, Counter2 As Integer Dim Keys(), subKeys() As String Dim MyQueryStringCollection As NameValueCollection MyQueryStringCollection=Request.QueryString Keys = MyQueryStringCollection.AllKeys For Counter1 = 0 To Keys.GetUpperBound(0)

  Response.Write("Key: " & Keys(Counter1) & "
") subKeys = MyQueryStringCollection.GetValues(Counter1) " Get all values under this key. For Counter2 = 0 To subKeys.GetUpperBound(0) Response.Write("Value " & CStr(Counter2) & ": " & subKeys(Counter2) & "
") Next Counter2

Next Counter1 %>

</body> </html>

      </source>