Hide Gridview column

static public void HideGridviewColumns(GridView aGridView,ArrayList arrColumnName)
    {
        System.Web.UI.WebControls.BoundField DataColumn;
        if (arrColumnName.Count > 0)
        {
            for (int Index = 0; Index < aGridView.Columns.Count; Index++)
            {
                DataColumn = aGridView.Columns[Index] as System.Web.UI.WebControls.BoundField;
                if (DataColumn != null)
                {
                    DataColumn.Visible = !arrColumnName.Contains(DataColumn.HeaderText);
                }
            }
        }
        else
        {
            for (int Index = 0; Index < aGridView.Columns.Count; Index++)
            {
                DataColumn = aGridView.Columns[Index] as System.Web.UI.WebControls.BoundField;
                if (DataColumn != null)
                {
                    DataColumn.Visible = false;
                }
            }
        }
    }