Unable to hide column in gridview

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

GridView1.DataSource = myDataSet;
        GridView1.DataKeyNames = new string[] { "IsRead" };
        GridView1.DataBind();
        GridView1.Columns[0].Visible = false;
        GridView1.Columns[5].Visible = false;
        GridView1.Columns[6].Visible = false;
        GridView1.Columns[7].Visible = false;
        GridView1.Columns[8].Visible = false;