Hi Lee,
Thanks for using Syncfusion products.
We suggest you to save the exported excel file in server by setting SaveIn type
while creating object for GridExcelExport class to achieve your
requirement. Please refer to the code snippet below to achieve this.
protected void Button1_Click(object sender, EventArgs e)
{
GridExcelExport excel = new GridExcelExport(this.GridGroupingControl1, @"C:\Sample.xlsx", SaveIn.Server);
excel.ExportNestedTable = true;
excel.Export();
}
Please let us know if you have any concern.
Regards,
Ranjithkumar.