CustomValidator问题，请大家指点指点~~~
碰到一个奇怪的问题，下面是我模拟这个问题的一个简单例子，请大家指点
有三个panel。panel1，panel2，panel3。页面加载隐藏panel2和panel3.点击panel1中的下一步，到达panel2。其中panel2中有一个CustomValidator验证，验证textbox中的值是否为aa。如果不是则提示“用户不存在”然后点击下一步进入panel3.
问题： 验证控件不起作用，CustomValidator1_ServerValidate不执行。不知道为什么。如果只是在一个页面上加一个textbox。一个按钮，一个验证控件。它是起作用的。请大家帮忙~~谢谢。
html代码如下：
<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>无标题页</title> <style type="text/css"> .style1 { width: 100%; } .style2 { width: 630px; text-align: right; } </style></head><body> <form id="form1" runat="server"> <div> <asp:Panel ID="Panel1" runat="server"> <table class="style1"> <tr> <td> 1</td> </tr> <tr> <td style="text-align: center"> <asp:Button ID="Button1" runat="server" onclick="Button1_Click" style="text-align: left" Text="Button" /> </td> </tr> </table> </asp:Panel> <asp:Panel ID="Panel2" runat="server"> <table class="style1"> <tr> <td class="style2"> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> </td> <td> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="不能为空">*</asp:RequiredFieldValidator> <asp:CustomValidator ID="CustomValidator1" runat="server" ControlToValidate="TextBox1" Display="Dynamic" ErrorMessage="用户已存在" onservervalidate="CustomValidator1_ServerValidate">*</asp:CustomValidator> </td> </tr> <tr> <td class="style2"> </td> <td> </td> </tr> <tr> <td class="style2"> </td> <td> </td> </tr> <tr> <td colspan="2" style="text-align: center"> <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="Button" /> </td> </tr> </table> </asp:Panel> <asp:Panel ID="Panel3" runat="server"> <table class="style1"> <tr> <td colspan="2"> 3</td> </tr> <tr> <td> </td> <td> </td> </tr> </table> </asp:Panel> </div> </form></body></html>
protected void Page_Load(object sender, EventArgs e) { Panel1.Visible = true; Panel2.Visible = false; Panel3.Visible = false; } protected void Button1_Click(object sender, EventArgs e) { Panel1.Visible = false; Panel2.Visible = true; Panel3.Visible = false; } protected void Button2_Click(object sender, EventArgs e) { if (this.IsValid) { Panel1.Visible = false; Panel2.Visible = false; Panel3.Visible = true; } } protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args) { if (TextBox1.Text == "aa") { args.IsValid = false; } else { args.IsValid = true; } } <script language="javascript" type="text/javascript"> function validateStr(oSrc, args) { strT = document.getElementById("txtName"); strText = "aa,AA"; var strs = new Array(); strs = strText.split(","); for (i = 0; i < strs.length; i++) { args.IsValid = (strs[i] != strT.value); if ((strs[i] != strT.value) == false) { break; } } } </script> <asp:TextBox ID="txtName" runat="server" Width="262px"></asp:TextBox> <asp:CustomValidator ID="cvtxtName" runat="server" ErrorMessage=" aa存在." ValidationGroup="btn" ControlToValidate="txtName" ClientValidationFunction="validateStr"></asp:CustomValidator><asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" ValidationGroup="btn" />后台 protected void Button1_Click(object sender, EventArgs e) { if (IsValid) { //验证通过,显示Panel } }