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 inGridView1.Rows)

            {

                gvr.Cells[0].Visible = false;

            }

        }