建立SSL/TLS安全通道的信任关系.

问题描述

我想将数据导出为pdf.
为此，我这样写了

I want to export data to pdf.
for that i wrote like this

protected void btnExportToPDF_Onclick(object sender, EventArgs e)
       {


           Response.ContentType = "application/pdf";
           Response.AddHeader("content-disposition", "attachment;filename=ExportPDF.pdf");
           Response.Cache.SetCacheability(HttpCacheability.NoCache);
           StringWriter sw = new StringWriter();
           HtmlTextWriter hw = new HtmlTextWriter(sw);

           Table3.RenderControl(hw);
           lblMessbody.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();


       }

在上面的下划线句子中，我收到了一些类似这样的错误消息

基础连接已关闭:无法为SSL/TLS安全通道建立信任关系.

in the above underline sentence i got some error message like this

The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

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