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

How can I hide CommandField Button in GridView when user is Admin ?

<asp:GridView ID="AdminGrid" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None" HorizontalAlign="Center" AutoGenerateColumns="false" ShowHeaderWhenEmpty="true" Width="900px" Height="121px" OnRowDataBound="OnRowDataBound"
    DataKeyNames="Uid" AllowPaging ="true" OnRowDeleting="OnRowDeleting" OnSelectedIndexChanged="AdminGrid_SelectedIndexChanged">
    <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
    <EditRowStyle BackColor="#999999" />
    <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
    <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
    <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
    <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
    <SortedAscendingCellStyle BackColor="#E9E7E2" />
    <SortedAscendingHeaderStyle BackColor="#506C8C" />
    <SortedDescendingCellStyle BackColor="#FFFDF8" />
    <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
    <Columns>
        <asp:TemplateField HeaderText="Email Address" ItemStyle-Width="300">
            <ItemTemplate>
                <asp:Label ID="Label1" runat="server" Text='<%# Eval("email") %>' />
            </ItemTemplate>
            <EditItemTemplate>
                <asp:TextBox ID="txtname" Text="" runat="server" />
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="footertxtname" Text="" runat="server" />
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Role">
            <ItemTemplate>
                <asp:Label ID="Label2" runat="server" Text='<%# Eval("UserRole") %>' />
            </ItemTemplate>
            <EditItemTemplate>
                <asp:TextBox ID="txtname" Text="" runat="server" />
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="footertxtname" Text="" runat="server" />
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Date Created/Time" ItemStyle-Width="300">
            <ItemTemplate>
                <asp:Label ID="Label3" runat="server" Text='<%# Eval("CreateDate") %>' />
            </ItemTemplate>
            <EditItemTemplate>
                <asp:TextBox ID="txtname" Text="" runat="server" />
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="footertxtname" Text="" runat="server" />
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="">
            <ItemTemplate>
            </ItemTemplate>
            <EditItemTemplate>
            </EditItemTemplate>
            <FooterTemplate>
            </FooterTemplate>
        </asp:TemplateField>
         <asp:CommandField ButtonType="Button" ShowDeleteButton="true" ItemStyle-ForeColor="#00003D" ItemStyle-Width="150" />
    </Columns>
    <EmptyDataTemplate>
        <div style="text-align: center;">
            No User Records</div>
    </EmptyDataTemplate>
</asp:GridView>

   protected void Page_Load(object sender, EventArgs e)
   {
       if (!this.IsPostBack) 
       {
           this.BindGrid(); 
           string UserRole = "A";
           foreach (GridViewRow row in AdminGrid.Rows)
           {
               Button btnDelete = row.Cells[4].Controls[0] as Button;
               if (UserRole == "A")
               {
                   btnDelete.Visible = true;
               }
               else if (UserRole == "U")
               {
                   btnDelete.Visible = false;
               }
           }
       }
   }