Why wont datagrid update after delete

I have the following code in code behind

 Private Sub DisplayRoles()
        Try
            gvRoles.DataSource = Roles.GetAllRoles()
            gvRoles.DataBind()

        Catch ex As Exception
            Dim myError As String = ex.Message
        End Try
            End Sub

    Private Sub gvRoles_PageIndexChanging(sender As Object, e As GridViewPageEventArgs) Handles gvRoles.PageIndexChanging
        gvRoles.PageIndex = e.NewPageIndex
        DisplayRoles()
    End Sub

    Private Sub gvRoles_RowCommand(sender As Object, e As GridViewCommandEventArgs) Handles gvRoles.RowCommand
        Try
            If e.CommandName = "Delete" Then
                Dim myRow As String = e.CommandArgument
                Roles.DeleteRole(myRow)
                DisplayRoles()
            Else
            End If

        Catch ex As Exception
            Dim myError As String = ex.Message
        End Try

        
        
    End Sub

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This is what the html page looks like for the most part

<div class="container">
        <div class="row">
            <div class="col-md-4 col-sm-2">
                <asp:UpdatePanel ID="pnlRoles" runat="server" >
                    <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="gvroles" EventName="RowCommand" />
                    </Triggers>
                    <ContentTemplate>
                        <asp:GridView ID="gvRoles" runat="server" CssClass="table table-bordered table-striped table-responsive pagination-ys" AllowPaging="True" AutoGenerateColumns="False" PageSize="3">
                    <Columns>
                        <asp:TemplateField HeaderText="Role Name">
                           
                            <ItemTemplate>
                                <asp:Label ID="Label1" runat="server" Text='<%# Container.DataItem %>' ></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        
                        <asp:TemplateField HeaderText="Remove" FooterStyle-VerticalAlign="Top">
                            <ItemTemplate>
                                <asp:ImageButton ID="ImageButton1" runat="server" CausesValidation="False" 
                                    CommandArgument="<%# Container.DataItem %>" CommandName="Delete" Text="" ImageUrl="~/Images/delete.png" ItemStyle-VerticalAlign="Top" Height="50px" Width="50px"></asp:ImageButton>
                            </ItemTemplate>
                        </asp:TemplateField>
                        
                    </Columns>
                    <PagerStyle CssClass="table" />
                </asp:GridView>

                    </ContentTemplate>

                </asp:UpdatePanel>


                
            </div>

        </div>
         

    </div>
   


    <div class="container">

        <div class="row">
            <div class="col-md-2 col-sm-3">
                <b>Create a New Role</b>

            </div>
            <div class="col-md-2 col-sm-2">
                <asp:TextBox ID="txtRoleName" runat="server">
                </asp:TextBox>
                 </div>
                <div class="col-md-3">
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Role is a Required Field"
                    ControlToValidate="txtRoleName" CssClass="text-danger" ></asp:RequiredFieldValidator>
                </div>
                
           

        </div>
        <div class="row">
            <br />

            <asp:Button ID="CreateRoleButton" runat="server" Text="Create Role" CssClass="btn-success"  />
        </div>
    </div>

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So my question is I can add a role and the grid updates and all is well.  However if I go to delete the row, the grid is not displayed correctly unless on go from 1 grid page to the next, ( i set the grid page length to 3 to test) or refresh the entire page.

When I tell it to displayroles it does have in there the correct number of rows, however the grid doesnt change.  

Any Ideas?

thanks