Forward the user to the information page, with the query string data (#) : Server class « Development « ASP.NET Tutorial

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ASP.NET Tutorial » Development » Server class 




<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="QueryStringSender" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ListBox ID="lstItems" 
                     runat="server" 
                     Height="155px" 
                     Width="165px"></asp:ListBox><br />
        <br />
        <asp:CheckBox ID="chkDetails" 
                      runat="server" 
                      Text="Show full details" /><br />
        <br />
        <asp:Button ID="cmdGo" 
                    runat="server" 
                    OnClick="cmdGo_Click" 
                    Text="View Information"
            Width="165px" /><br />
        <br />
        <asp:Label ID="lblError" runat="server" EnableViewState="False"></asp:Label>
    
    </div>
    </form>
</body>
</html>



File: Default.aspx.cs


using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class QueryStringSender : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    if (!this.IsPostBack)
    {
      lstItems.Items.Add("A");
      lstItems.Items.Add("B");
      lstItems.Items.Add("C");
      lstItems.Items.Add("D");
      lstItems.Items.Add("F");
    }
    }
  protected void cmdGo_Click(object sender, EventArgs e)
  {
    if (lstItems.SelectedIndex == -1)
        {
            lblError.Text = "You must select an item.";
        }
        else
        {
            string url = "NextPage.aspx?";
            url += "Item=" + Server.UrlEncode(lstItems.SelectedItem.Text"&";
            url += "Mode=" + chkDetails.Checked.ToString();
            Response.Redirect(url);
        }
    }

}


File: NextPage.aspx


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NextPage.aspx.cs" Inherits="QueryStringRecipient" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="lblInfo" runat="server" EnableViewState="False" ></asp:Label>
    </div>
    </form>
</body>
</html>



File: NextPage.aspx.cs


using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class QueryStringRecipient : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        lblInfo.Text = "Item: " + Request.QueryString["Item"];
        lblInfo.Text += "<br />Show Full Record: ";
        lblInfo.Text += Request.QueryString["Mode"];
    }
}














9.39.Server class
9.39.1.Use Server.HtmlEncode to encode HTML tags (C#)
9.39.2.Use Server.Transfer to transfer action to another aspx file (C#)
9.39.3.Server.UrlEncode
9.39.4.Forward the user to the information page, with the query string data (#)
9.39.5.Use Server.MapPath() to load the file in the current directory (VB.net)
9.39.6.Demonstration of Page_Error Handler
9.39.7.text generated by Execute can be embedded in the main response or cached in a writer object
9.39.8.Server.Execute
9.39.9.Server.GetLastError()
9.39.10.Server.HtmlDecode
9.39.11.Server.HtmlEncode
9.39.12.Server.MachineName
9.39.13.Server.MapPath
9.39.14.Server.ScriptTimeout
9.39.15.Server.Transfer
9.39.16.Server.UrlDecode
9.39.17.Server.UrlPathEncode
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