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请问有一个自定议控件问题不知怎么解决，请教高手
//这是一个\VoteSystem工程下的首页文件Default.aspx，引用了3个自定义控件，其中voteControl这个自控义控件报有问题
<%@ Register Src="voteControl.ascx" TagName="voteControl" TagPrefix="uc3" %>
<%@ Register Src="NavigationControl.ascx" TagName="NavigationControl" TagPrefix="uc1" %>
<%@ Register Src="foot.ascx" TagName="foot" TagPrefix="uc2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta content="zh-cn" http-equiv="Content-Language" />
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<title>无标题 1</title>
<link href="css/StyleCSS.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="tbody">
<div class="thead">
<br />
<br />
<br />
<uc1:NavigationControl ID="NavigationControl1" runat="server" />
</div>
<div class="cbody">
<div class="lbody">
<div class="biaoti">
<br/>
<br/>
给他人一个机会也是给自己一个机会！<br/>
</div>
<div class="picture001">
<asp:Image ID="Image1" runat="server" ImageUrl="~/img/tuopie.gif" /><br />
<asp:Image ID="Image2" runat="server" ImageUrl="~/img/zenhan.gif" /></div>
</div>
<div class="rbody">
<div class="rbodytop">
</div>
<div class="rbodycenter">
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<uc3:voteControl ID="VoteControl1" runat="server" />
</div>
</div>
</div>
<div class="foot">
<uc2:foot ID="Foot1" runat="server" />
</div>
</div>
</body>
</html>
//自定义控件voteControl.ascx代码如下：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="voteControl.ascx.cs" Inherits="voteControl" %>
<div style="text-align: center">
<table border="0" cellpadding="0" cellspacing="0" style="width: 500px">
<tr>
<td align="center" style="width: 100%">
<asp:Label ID="lblVoteTitle" runat="server" Text="你的投票信息"></asp:Label></td>
</tr>
<tr>
<td align="center" style="width: 100%">
<asp:RadioButtonList ID="RadioButtonList1" runat="server">
</asp:RadioButtonList></td>
</tr>
<tr>
<td align="center" style="width: 100%">
<asp:Button ID="btnVote" runat="server" Text="投票" />
<asp:Button ID="btnShow" runat="server" Text="结果" /></td>
</tr>
</table>
</div>
//报错的信息如下：
“/VoteSystem”应用程序中的服务器错误。
--------------------------------------------------------------------------------
类型“Button”的控件“VoteControl1_btnVote”必须放在具有 runat=server 的窗体标记内。
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。
异常详细信息: System.Web.HttpException: 类型“Button”的控件“VoteControl1_btnVote”必须放在具有 runat=server 的窗体标记内。
源错误:
执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。
堆栈跟踪:
[HttpException (0x80004005): 类型“Button”的控件“VoteControl1_btnVote”必须放在具有 runat=server 的窗体标记内。]
System.Web.UI.Page.VerifyRenderingInServerForm(Control control) +8686387
System.Web.UI.WebControls.Button.AddAttributesToRender(HtmlTextWriter writer) +54
System.Web.UI.WebControls.WebControl.RenderBeginTag(HtmlTextWriter writer) +20
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +20
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.Control.Render(HtmlTextWriter writer) +10
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.Page.Render(HtmlTextWriter writer) +29
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1266
--------------------------------------------------------------------------------
版本信息: Microsoft .NET Framework 版本:2.0.50727.3053; ASP.NET 版本:2.0.50727.3053
请问怎么解决？我可以肯定是Button控件的问题，但他报的Button控件是不存在的，这是怎么回事，因为Button控件只有两个：btnVote和btnShow
//这是一个\VoteSystem工程下的首页文件Default.aspx，引用了3个自定义控件，其中voteControl这个自控义控件报有问题
<%@ Register Src="voteControl.ascx" TagName="voteControl" TagPrefix="uc3" %>
<%@ Register Src="NavigationControl.ascx" TagName="NavigationControl" TagPrefix="uc1" %>
<%@ Register Src="foot.ascx" TagName="foot" TagPrefix="uc2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta content="zh-cn" http-equiv="Content-Language" />
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<title>无标题 1</title>
<link href="css/StyleCSS.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="tbody">
<div class="thead">
<br />
<br />
<br />
<uc1:NavigationControl ID="NavigationControl1" runat="server" />
</div>
<div class="cbody">
<div class="lbody">
<div class="biaoti">
<br/>
<br/>
给他人一个机会也是给自己一个机会！<br/>
</div>
<div class="picture001">
<asp:Image ID="Image1" runat="server" ImageUrl="~/img/tuopie.gif" /><br />
<asp:Image ID="Image2" runat="server" ImageUrl="~/img/zenhan.gif" /></div>
</div>
<div class="rbody">
<div class="rbodytop">
</div>
<div class="rbodycenter">
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<uc3:voteControl ID="VoteControl1" runat="server" />
</div>
</div>
</div>
<div class="foot">
<uc2:foot ID="Foot1" runat="server" />
</div>
</div>
</body>
</html>
//自定义控件voteControl.ascx代码如下：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="voteControl.ascx.cs" Inherits="voteControl" %>
<div style="text-align: center">
<table border="0" cellpadding="0" cellspacing="0" style="width: 500px">
<tr>
<td align="center" style="width: 100%">
<asp:Label ID="lblVoteTitle" runat="server" Text="你的投票信息"></asp:Label></td>
</tr>
<tr>
<td align="center" style="width: 100%">
<asp:RadioButtonList ID="RadioButtonList1" runat="server">
</asp:RadioButtonList></td>
</tr>
<tr>
<td align="center" style="width: 100%">
<asp:Button ID="btnVote" runat="server" Text="投票" />
<asp:Button ID="btnShow" runat="server" Text="结果" /></td>
</tr>
</table>
</div>
//报错的信息如下：
“/VoteSystem”应用程序中的服务器错误。
--------------------------------------------------------------------------------
类型“Button”的控件“VoteControl1_btnVote”必须放在具有 runat=server 的窗体标记内。
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。
异常详细信息: System.Web.HttpException: 类型“Button”的控件“VoteControl1_btnVote”必须放在具有 runat=server 的窗体标记内。
源错误:
执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。
堆栈跟踪:
[HttpException (0x80004005): 类型“Button”的控件“VoteControl1_btnVote”必须放在具有 runat=server 的窗体标记内。]
System.Web.UI.Page.VerifyRenderingInServerForm(Control control) +8686387
System.Web.UI.WebControls.Button.AddAttributesToRender(HtmlTextWriter writer) +54
System.Web.UI.WebControls.WebControl.RenderBeginTag(HtmlTextWriter writer) +20
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +20
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.Control.Render(HtmlTextWriter writer) +10
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
System.Web.UI.Page.Render(HtmlTextWriter writer) +29
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1266
--------------------------------------------------------------------------------
版本信息: Microsoft .NET Framework 版本:2.0.50727.3053; ASP.NET 版本:2.0.50727.3053
请问怎么解决？我可以肯定是Button控件的问题，但他报的Button控件是不存在的，这是怎么回事，因为Button控件只有两个：btnVote和btnShow
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