SQL Server :: Unable To Populate A Text Box With Values In A Dataset

i am trying to run this code, but even if it has somes results, it gives an exception saying that there are no Rows at positions 0.

DataSet ds = new DataSet();
SqlConnection conn = new SqlConnection();
conn.ConnectionString = (ConfigurationManager.AppSettings["Gulfcoast"]);
conn.Open();
SqlCommand cmd = new SqlCommand("SP_GetSavedInvestigation", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@rlname", SqlDbType.NVarChar).Value = ddsavedsearch.SelectedValue.ToString();
cmd.ExecuteNonQuery();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
if(ds!=null)
{
Criteria.Text = ds.Tables[0].Rows[0]["rl_criteria1"].ToString();
}