How to close webform window after download of excel file is complete in asp.net using c#

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C#

Hello friends,

I have a task to download a gridview data to excel as it is shown in gridview.
I did this and the problem is that when the download is complete, I need to close the window as it is literally blank.
I can either show a message and button to close the window but anyhow I have to close the window.
Please help. I have code something like this.

if (dt.Rows.Count > 0)
{
        int RowsCount = dt.Rows.Count;
        System.Random rd = new System.Random(DateTime.Now.Millisecond);
        int MyValue = rd.Next(1000000, 99999999);
        sUniqueName = MyValue.ToString();

        // Create a new workbook.
        SpreadsheetGear.IWorkbook workbook = SpreadsheetGear.Factory.GetWorkbook();
        SpreadsheetGear.IRange cells = workbook.Worksheets[0].Cells;

        #region Formatting Upper Table Datas            

        #endregion
        var timeUnit = dt.Rows[0]["ContractTimeUnit"].ToString();
        var lineItemTotal = dt.Rows[0]["LineItemTotal"].ToString();

        cells.CopyFromDataTable(dt, SpreadsheetGear.Data.SetDataFlags.None);
        string filename = string.Format("{0}-{1}-{2}", "CustomUpdatesFromASP.aspx.cs", DateTime.Now.ToString("MM-dd-yy"), sUniqueName);
        Response.Clear();
        Response.ContentType = "application/vnd.ms-excel";
        Response.AddHeader("Content-Disposition", "attachment; filename=" + filename + ".xls");
        workbook.SaveToStream(Response.OutputStream, SpreadsheetGear.FileFormat.Excel8);
        Response.End();
}

After the Response.End() i.e. after the download is complete, I tried to use javascript to close the window but it did not work.

the javascript function I used after Response.End() is something like this.

ScriptManager.RegisterStartupScript(this, this.GetType(), "CloseWindow", "javascript:window.close();", true);

Please help me with this situation.

Thanks