Show Hide GridView CommandField Edit Button based on User Role using C# and VB.Net in ASP.Net

Hello,

I am following this Role based Authorization and Authentication in ASP.Net

I have make now Administrator and Users, also managerial

My menu from this ASP.Net Menu control: Change color of selected item depending on selection

and show only Edit from GridView

<asp:CommandField ButtonType="Link" ShowEditButton="true" ShowDeleteButton="true" ItemStyle-Width="150" HeaderText="تعديل">
    <ItemStyle Width="70px" HorizontalAlign="Center"></ItemStyle>
</asp:CommandField>

gvFiles.DataSource = dt;
gvFiles.DataBind();
gvFiles.Columns[3].Visible = this.Page.User.IsInRole("Administrator");