在asp.net中将gridview列设置为不可编辑

我需要将gridview列设置为不可编辑。我还尝试了（（BoundField）gridView1.Columns[columnIndex]）.ReadOnly=true；但给出了无效索引的错误。我不知道在哪里用。我在划船时用过它。

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        OleDbConnection conn;
        OleDbCommand cmd = new OleDbCommand();
        string path = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|'website.mdb;Persist Security Info=False";
        conn = new OleDbConnection(path);
        conn.Open();
        cmd.Connection = conn;
        cmd.CommandText = "select [email],[password] from users";
        OleDbDataAdapter da = new OleDbDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        GridView1.DataSource = ds;
        GridView1.DataBind();
        conn.Close();
        GridView1.EditIndex = e.NewEditIndex;
        GridView1.DataBind();
    }

更新代码：ASPX-

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" BackColor="LightGoldenrodYellow" BorderColor="Tan" BorderWidth="1px" Caption="User Info" CaptionAlign="Top" CellPadding="2" Font-Bold="True" ForeColor="Black" GridLines="None" ShowHeader="False" UseAccessibleHeader="False" Width="573px" AutoGenerateDeleteButton="True" AutoGenerateEditButton="True" OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowDeleting="GridView1_RowDeleting" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating"></asp:GridView>

GridView1.Columns["ColumnName"].ReadOnly = true;