在 ASP.NET 中使用多个 runat=server form

ASP.NET 在同一个页面不支持多个 runat=server forms，要解决这个问题，可以把每个 form 放在一个单独的 panel 控件中，这样用户就可以简单地通过单选按钮在不同 panel 间切换。
代码如下：
2FormExample.ASPx

<%@ Page language="c#" Codebehind="2FormExample.cs" AutoEventWireup="false" Inherits="_3leaf_app.C2FormExample" %>

Lookup by

First Name :





Last Name :

2FormExample.cs

namespace _3leaf_app
{
using System;
using System.Collections;
using System.ComponentModel;
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;

///

/// Summary description for C2FormExample.
///

public class C2FormExample : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button Button2;
protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator2;
protected System.Web.UI.WebControls.TextBox TextBox2;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1;
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.Panel Panel2;
protected System.Web.UI.WebControls.Panel Panel1;
protected System.Web.UI.WebControls.RadioButton RadioButton2;
protected System.Web.UI.WebControls.RadioButton RadioButton1;

public C2FormExample()
{
Page.Init += new System.EventHandler(Page_Init);
}

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
}
}

protected void Page_Init(object sender, EventArgs e)
{
//
// CODEGEN: This call is required by the ASP+ Windows Form Designer.
//
InitializeComponent();
}

///

/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///

private void InitializeComponent()
{
RadioButton1.CheckedChanged += new System.EventHandler (this.RadioButton1_CheckedChanged);
Button1.Click += new System.EventHandler (this.Button1_Click);
RadioButton2.CheckedChanged += new System.EventHandler (this.RadioButton2_CheckedChanged);
Button2.Click += new System.EventHandler (this.Button2_Click);
this.Load += new System.EventHandler (this.Page_Load);
}

public void Button2_Click (object sender, System.EventArgs e)
{
Label1.Text = "You want to search on last name";
}

public void Button1_Click (object sender, System.EventArgs e)
{
Label1.Text = "You want to search on first name";
}

public void RadioButton2_CheckedChanged (object sender, System.EventArgs e)
{
Panel1.Visible = false;
Panel2.Visible = true;
}

public void RadioButton1_CheckedChanged (object sender, System.EventArgs e)
{
Panel1.Visible = true;
Panel2.Visible = false;
}
}
}