C# 在Sharepoint自定义web部件中导出为PDF

我想在sharepoint custm web部件中将我的页面导出为pdf。我使用下面的代码导出到pdf。当我点击“导出”按钮时，我看到下面的错误。如何解决此错误？请帮帮我

代码

protected void ExporttoPDF_Click(object sender, EventArgs e)
{
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment;filename=ExporttoPDF.pdf");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        this.Page.RenderControl(hw);
        StringReader sr = new StringReader(sw.ToString());
        Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 100f, 0f);
        HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
        PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
        pdfDoc.Open();
        htmlparser.Parse(sr);
        pdfDoc.Close();
        Response.Write(pdfDoc);
        Response.End();
}

错误

“/”应用程序中出现服务器错误。 RegisterForEventValidation只能在Render（）期间调用； 描述：执行当前web请求期间发生未处理的异常。请查看堆栈跟踪以了解有关错误的更多信息以及错误在代码中的起源

Exception Details: System.InvalidOperationException: 
RegisterForEventValidation can only be called during Render();

源错误：

在执行当前web请求期间生成了未经处理的异常。有关异常的起源和位置的信息可以使用下面的异常堆栈跟踪来识别

堆栈跟踪：

[InvalidOperationException: RegisterForEventValidation can only be called during Render();]
   System.Web.UI.ClientScriptManager.RegisterForEventValidation(String uniqueId, String argument) +11081278
   System.Web.UI.WebControls.TextBox.AddAttributesToRender(HtmlTextWriter writer) +455
   System.Web.UI.WebControls.WebControl.RenderBeginTag(HtmlTextWriter writer) +27
   System.Web.UI.WebControls.TextBox.Render(HtmlTextWriter writer) +27
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +42
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +411
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +87
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +53
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +42
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.Page.Render(HtmlTextWriter writer) +38
   Microsoft.SharePoint.WebPartPages.WikiEditPage.Render(HtmlTextWriter writer) +207
   PayrollProject.PaySlip4Employee.PaySlip4EmployeeUserControl.btnPDF_Click(Object sender, EventArgs e) +425
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +115
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +140
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +29
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2981

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版本信息：Microsoft.NET Framework版本：2.0.50727.5472；ASP.NET版本：2.0.50727.5474

EnableEventValidation ="false"

像

我尝试了这一次，但发现了以下错误。分析器错误消息：分析属性“enableeventvalidation”时出错：类型“PayrollProject.PaySlip4Employee.PaySlip4EmployeeUserControl”没有名为“enableeventvalidation”的公共属性。我认为您的{System.InvalidOperationException}问题已解决..如果我帮助您将我的答案标记为useful@Ramadurai你有产量吗？

<%@ Page Language="C#" AutoEventWireup="true" Debug ="true" EnableEventValidation ="false" CodeFile="Default.aspx.cs" Inherits="_Default" %>