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" %>
<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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