How to create blank Excel sheet in Asp.net C#

public void ExportTableData(DataTable dtdata)
{
    string attach = "attachment;filename=Sample.xls";
    Response.ClearContent();
    Response.AddHeader("content-disposition", attach);
    Response.ContentType = "application/ms-excel";
    if (dtdata != null)
    {
       // foreach (DataColumn dc in dtdata.Columns) // if u need to add data uncomment this
       // {
       //     Response.Write(dc.ColumnName + "\t");

       //}
       // Response.Write(System.Environment.NewLine);
       // foreach (DataRow dr in dtdata.Rows)
       //{
       //     for (int i = 0; i < dtdata.Columns.Count; i++)
       //     {
       //         Response.Write(dr[i].ToString() + "\t");
       //     }
       //     Response.Write("\n");
       }
        Response.End();
    }
}