How to hide Gridview column programmatically?

        GridView1.DataBind();

        if (GridView1.Columns.Count > 0)

            GridView1.Columns[0].Visible = false;

        else

        {

            GridView1.HeaderRow.Cells[0].Visible = false;

            foreach (GridViewRow gvr in GridView1.Rows)

            {

                gvr.Cells[0].Visible = false;

            }

        }

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how to find and delete duplicate records in oracle

 // For Select duplicate records

select *
from table_Name
group by key1, key2 having count (*) > 1;


// For   delete duplicate records

delete from test a
where rowid <> ( select max(rowid)
from test b
where a.sno = b.sno
and a.sname = b.sname )

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