title: Cannot export to Excel in IE 11
body: <p>I have a web application that exports data from a gridview to Excel. It works fine in Chrome but doesn't work in IE 11 and Firefox. I see a lot of issues with this when I google it but this error seems to be unique.</p>
  
  <pre class="lang-cs prettyprint-override"><code>protected void ExportToExcel(List&lt;MapAmericas.Model.Project&gt; Projects)
  {
      Response.Clear();
      Response.Buffer = true;
      Response.ContentType = "application/vnd.ms-excel";
      Response.ContentEncoding = System.Text.Encoding.Unicode;
      Response.AddHeader("content-disposition", "attachment;filename=MyFile" + DateTime.Now.ToString() + ".xls");
      Response.Charset = "";
      Response.BinaryWrite(System.Text.Encoding.Unicode.GetPreamble());
      this.EnableViewState = false;
  
      System.IO.StringWriter sw = new System.IO.StringWriter();
      System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);
  
      GridView gv = new GridView();
      gv.AutoGenerateColumns = false;
      gv.RowDataBound += new GridViewRowEventHandler(dataExportExcel_ItemDataBound);
  
      gv.DataSource = Projects;
      gv.DataBind();
  
      gv.RenderControl(htw);
      Response.Write(AddExcelStyling()); //this contains the opening html elements
      StringBuilder sbResponseString = new StringBuilder();
      sbResponseString.Append(sw + "&lt;/body&gt;&lt;/html&gt;");
      Response.Write(sbResponseString.ToString());
      Response.Flush();
      Response.Close();
      Response.End();
  }
  </code></pre>
  
  <p>...and the issue I'm getting has to do with not being able to access Temporary Internet Files. I get a popup "Problems during Load" and about a dozen entries: "Missing File...Temporary Internet Files\Content\" and then I get a message reading "Unable to read file".
  I had an image to represent the error but I'm not able to upload images.
  When I click on one of the links, it loads up my webpage without any styles and I don't get an excel file.
  Does anyone know what the issue would be?</p>