How to export dataGridView data Instantly to Excel on button click?

Question

I have 10k rows and 15 column in my data grid view. I want to export this data to an excel sheet o button click. I have already tried with the below code.

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Answer 1

The Best is use use closedxml.codeplex.com Library.Refer it @https://closedxml.codeplex.com/wikipage?title=Adding%20DataTable%20as%20Worksheet&referringTitle=Documentation

var wb = new ClosedXML.Excel.XLWorkbook();
DataTable dt = GetTheDataTable();//Refer documentation


wb.Worksheets.Add(dt);

Response.Clear();
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment;filename=\"FileName.xlsx\"");

using (var ms = new System.IO.MemoryStream()) {
    wb.SaveAs(ms);
    ms.WriteTo(Response.OutputStream);
    ms.Close();
}

Response.End();