Export data issue

Question

SqlConnection con = new SqlConnection("database connection string");

SqlCommand cmd = new SqlCommand("Select name,address from employee", con);

try

{

SqlDataAdapter da = new SqlDataAdapter();

da.SelectCommand = cmd;

DataTable dt = new DataTable();

da.Fill(dt);

DataSet ds = new DataSet("New_DataSet");

ds.Locale = System.Threading.Thread.CurrentThread.CurrentCulture;

da.Fill(dt);

ds.Tables.Add(dt);

ExcelLibrary.DataSetHelper.CreateWorkbook("D:\\Employee.xls", ds);

MessageBox.Show("Exported");

}

catch (Exception ec)

{

MessageBox.Show(ec.Message);

}

 

 

using above query when I am exporting data to excel sheet it copies the same date three times in output