Exporting data from table into excel with "xlxs"or "csv" extension - asp.net-mvc-4

Question

I am using a export method in my controller to download data from table into excel file using this method:
here is my table in index file:
<table class="table">
<tr>
<th>
#Html.DisplayNameFor(model => model.Name)
</th>
<th>
#Html.DisplayNameFor(model => model.Marks)
</th>
<th>
#Html.DisplayNameFor(model => model.Grade)
</th>
<th></th>
</tr>
#foreach (var item in Model) {
<tr>
<td>
#Html.DisplayFor(modelItem => item.Name)
</td>
<td>
#Html.DisplayFor(modelItem => item.Marks)
</td>
<td>
#Html.DisplayFor(modelItem => item.Grade)
</td>
<td>
#Html.ActionLink("Edit", "Edit", new { id=item.id }) |
#Html.ActionLink("Details", "Details", new { id=item.id }) |
#Html.ActionLink("Delete", "Delete", new { id=item.id })
</td>
</tr>
}
</table>
and in my controller i have written this method which is triggered when u press the export button in index view:
public ActionResult ExportData()
{
GridView gv = new GridView();
gv.DataSource = db.Studentrecords.ToList();
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=Marklist.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
return RedirectToAction("StudentDetails");
}
everything is working fine the table gets downloaded into the excel file easily but when i open the file it gives this error in the start of open file that:
The file format doesn't match.The file could be corrupted or unsafe.
The problem is causing mainly because file gets saved with xls format where as i want to save it in xlxs format how can that be possible?

Answer 1

To export the MVC view data into an Excel file, I am using the ClosedXml Library.
public ActionResult ExportToExcel()
{
var gv = new GridView();
gv.DataSource = this.GetEmployeeList();
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=DemoExcel.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter objStringWriter = new StringWriter();
HtmlTextWriter objHtmlTextWriter = new HtmlTextWriter(objStringWriter);
gv.RenderControl(objHtmlTextWriter);
Response.Output.Write(objStringWriter.ToString());
Response.Flush();
Response.End();
return View("Index");
}
Link to Complete Article Article Link