Web Forms :: How To Save File To Server Rather Than Visitor Machine

i have get the piece of code from www.aspsbippets.com

protected void ExportToWord(object sender, EventArgs e)
{
//Get the data from database into datatable
string strQuery = "select CustomerID, ContactName, City, PostalCode" +
" from customers";
SqlCommand cmd = new SqlCommand(strQuery);
DataTable dt = GetData(cmd);
//Create a dummy GridView
GridView GridView1 = new GridView();
GridView1.AllowPaging = false;
GridView1.DataSource = dt;
GridView1.DataBind();
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition",
"attachment;filename=DataTable.doc");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-word ";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.RenderControl(hw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}

this code create word documnet and automatically downloaded to visitor machine, how i can save it on server rather than visitor machine?