creating an excel sheet using C#

Question

this is the code that i used to create an excel sheet using c# but no file\s are created how can i rectify ir               

protected void GenerateWorksheetSheet1(WorksheetCollection sheets)

{

Response.ClearContent();

Response.Buffer = true;

Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "Customers.xls"));

Response.ContentType = "application/ms-excel";

StringWriter sw = new StringWriter();

HtmlTextWriter htw = new HtmlTextWriter(sw);

gvDeatails.AllowPaging = false;

Worksheet sheet = sheets.Add("NTEOver500");

sheet.Table.DefaultRowHeight = 14.25F;

sheet.Table.DefaultColumnWidth = 54F;

sheet.Table.ExpandedColumnCount = 25;

sheet.Table.ExpandedRowCount = 4000;

sheet.Table.FullColumns = 1;

sheet.Table.FullRows = 1;

sheet.Table.Columns.Add(83);

sheet.Table.Columns.Add(72);

sheet.Table.Columns.Add(73);

WorksheetColumn column3 = sheet.Table.Columns.Add();

column3.Width = 69;

column3.Span = 1;

WorksheetColumn column4 = sheet.Table.Columns.Add();

column4.Index = 6;

column4.Width = 86;

WorksheetRow Row0 = sheet.Table.Rows.Add();

WorksheetCell cell;

cell = Row0.Cells.Add();

cell.Data.Type = DataType.String;

cell.Data.Text = "UserID";

cell = Row0.Cells.Add();

cell.Data.Type = DataType.String;

cell.Data.Text = "UserName";

cell = Row0.Cells.Add();

cell.Data.Type = DataType.String;

cell.Data.Text = "Education";

cell = Row0.Cells.Add();

cell.Data.Type = DataType.String;

cell.Data.Text = "Location";

sheet.Options.Selected = true;

sheet.Options.ProtectObjects = false;

sheet.Options.ProtectScenarios = false;

sheet.Options.PageSetup.Header.Margin = 0.3F;

sheet.Options.PageSetup.Footer.Margin = 0.3F;

sheet.Options.PageSetup.PageMargins.Bottom = 0.75F;

sheet.Options.PageSetup.PageMargins.Left = 0.7F;

sheet.Options.PageSetup.PageMargins.Right = 0.7F;

sheet.Options.PageSetup.PageMargins.Top = 0.75F;

}