how to correct this error "Index 0 is either negative or above rows count." in below code

SqlDataAdapter dmt = new SqlDataAdapter("select * from PartsInfoRetreive('" + this.comboBoxDesc.SelectedValue + "')", con);

DataSet smt = new DataSet();
dmt.Fill(smt, "qty");

DataView vmkt = new DataView(smk.Tables["qty"]);
txtIdentifica.Text = vmkt[0]["description"].ToString();
txtPartNo.Text = vmkt[1]["description"].ToString();
txtMark.Text = vmkt[2]["description"].ToString();
txtModel.Text = vmkt[3]["description"].ToString();
txtQuality.Text = vmkt[4]["description"].ToString();