Display A Gridview Using Select Statement Of Two Column In One Table?

I'm using asp.net and c# language.

How can i display a GridView using select statement of two column in one table?

This is my coding:

if (sdr.Read())
{
if(namaPembekal.Equals(sdr["namaPembekal"]) && tarikhRo.Equals(sdr["tarikhRo"]))
{
Session.Add("namaPembekal",sdr["namaPembekal"]);
Session.Add("tarikhRo", sdr["tarikhRo"]);
if((((String)(Session["namaPembekal"])).Equals("namaPembekal")) && ((String
(Session["tarikhRo"])).Equals("tarikhRo"))
GridView1.DataSourceID = SqlDataSource2.ID;
GridView1.DataSourceID = txtJourneyDate.Text;
}