Get Assigned Roles With LINQ

Here's one way of creating a RadGrid with assigned roles for users. 

   <telerik:RadGrid runat="server" ID="gridUsers" AllowSorting="True"

                   AutoGenerateColumns="False" GroupPanelPosition="Top" 

                   ResolvedRenderMode="Classic"
                   onneeddatasource="gridUsers_NeedDataSource"  
                   onitemdatabound="gridUsers_ItemDataBound">
        <MasterTableView>
            <Columns>
                <telerik:GridBoundColumn DataField="userName" 
                    HeaderText="User Name" 
                    UniqueName="colUserName">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="roles" 
                    HeaderText="Roles" 
                    UniqueName="colRoles">
                </telerik:GridBoundColumn>
                <telerik:GridBoundColumn DataField="isApproved" 
                    HeaderText="Active User?" 
                    UniqueName="colIsApproved">
                </telerik:GridBoundColumn>
            </Columns>
        </MasterTableView>
    </telerik:RadGrid>

using System;
using System.Linq;
using System.Web.Security;
using Telerik.Web.UI;

    protected void gridUsers_NeedDataSource(object sender, 
                     Telerik.Web.UI.GridNeedDataSourceEventArgs e)
    {
        try 
        { 
            using (var dc = new  MyModel.EntitiesModel())
            {
                var u = dc.Aspnet_Users.Select(a => new
                {
                    userName = a.UserName,
                    roles = string.Join(",", Roles.GetRolesForUser(a.UserName)),
                    isApproved = (Membership.GetUser(a.UserName)).IsApproved
                });
                if (null != u)
                {
                    this.gridUsers.DataSource = u.ToList();
                }
            }
        }
        catch (Exception)
        {
            throw;
        }
    }

    protected void gridUsers_ItemDataBound(object sender, 
                              Telerik.Web.UI.GridItemEventArgs e)
    {
        if (e.Item is GridDataItem)
        {
            GridDataItem dataItem = (GridDataItem)e.Item;
            if (dataItem["colIsApproved"].Text != null &&
dataItem["colIsApproved"].Text == "False")
            {
                dataItem["colIsApproved"].BackColor = System.Drawing.Color.Red;
                dataItem["colIsApproved"].ToolTip = "This person cannot login.";
            }
        }
    }