Exporting DataGrid to Text file in asp.net

Database db = DatabaseFactory.CreateDatabase();

DBCommandWrapper selectCommandWrapper =

db.GetStoredProcCommandWrapper("sp_GetLatestArticles");

DataSet ds = db.ExecuteDataSet(selectCommandWrapper);

StringBuilder str = new StringBuilder();

for (int i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)

{

for (int j = 0; j <= ds.Tables[0].Columns.Count - 1; j++)

{

str.Append(ds.Tables[0].Rows[i][j].ToString());

}

str.Append("<BR>");

}

Response.Clear();

Response.AddHeader("content-disposition",

"attachment;filename=FileName.txt");

Response.Charset = "";

Response.Cache.SetCacheability(HttpCacheability.NoCache);

Response.ContentType = "application/vnd.text";

System.IO.StringWriter stringWrite = new System.IO.StringWriter();

System.Web.UI.HtmlTextWriter htmlWrite =

new HtmlTextWriter(stringWrite);

Response.Write(str.ToString());

Response.End();