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，这样用户就可以简朴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\" %>
<html><head>
<meta name=vs_targetSchema content=\"HTML 4.0\">
<meta name=\"GENERATOR\" Content=\"Microsoft Visual Studio 7.0\">
<meta name=\"CODE_LANGUAGE\" Content=\"C#\"></head>
<body>
<form method=\"post\" runat=\"server\" ID=Form1>
<p>Lookup by
<asp:RadioButton id=RadioButton1 runat=\"server\" Text=\"First Name\" AutoPostBack=\"True\" groupname=g1 checked=True></asp:RadioButton>
<asp:RadioButton id=RadioButton2 runat=\"server\" Text=\"Last Name\" AutoPostBack=\"True\" groupname=g1></asp:RadioButton></p>
<p></p>
<p>
<asp:Panel id=Panel1 runat=\"server\" visible=True>
First Name :
<asp:TextBox id=TextBox1 runat=\"server\"></asp:TextBox>
<asp:RequiredFieldValidator id=RequiredFieldValidator1 runat=\"server\" ErrorMessage=\"*\" ControlToValidate=\"TextBox1\"></asp:RequiredFieldValidator>
<asp:Button id=Button1 runat=\"server\" Text=\"Submit\"></asp:Button>
</asp:Panel>
<asp:Panel id=Panel2 runat=\"server\" visible=False>
Last Name :
<asp:TextBox id=TextBox2 runat=\"server\"></asp:TextBox>
<asp:RequiredFieldValidator id=RequiredFieldValidator2 runat=\"server\" ErrorMessage=\"*\" ControlToValidate=\"TextBox2\"></asp:RequiredFieldValidator>
<asp:Button id=Button2 runat=\"server\" Text=\"Submit\"></asp:Button>
</asp:Panel>
<p></p>
<p>
<asp:label id=Label1 runat=\"server\"></asp:label>
</p>
</form>
</body></html>
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>
/// Summary description for C2FormExample.
/// </summary>
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();
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
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;
}
}
}
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