ADO.NET - Understanding DataSet

GridView1.DataSource = ds1.Tables[1]; not working.
I am not able to see any data.
I have used GridView1.DataBind(); too but still not working..

Good Explanation, please provide the Practiced code in desription or seprate file in website. It will be helpful... :)

DataRelation drel = new DataRelation("Emp_Dept_Rel", col_pk, col_fk, false); //ADD false

sir please provide code in desription or seprate file in website