Test.aspx
            <telerik:RadScriptManager ID="scriptManager" runat="server" />
            <telerik:RadComboBox ID="rcb" runat="server" Label="Medication:" AutoPostBack="true"
                Width="250" OnSelectedIndexChanged="rcb_SelectedIndexChanged">
                <Items>
                    <telerik:RadComboBoxItem Text="-- select --" Value="" />
                    <telerik:RadComboBoxItem Text="Benztropine 0.5 mg " />
                    <telerik:RadComboBoxItem Text="Buspirone 10 MG" />
                    <telerik:RadComboBoxItem Text="Haloperidol 100mg/ml" />
                    <telerik:RadComboBoxItem Text="Metaprolol 25 mg" />
                    <telerik:RadComboBoxItem Text="Quetiapin/Seroquel 400 mg" />
                    <telerik:RadComboBoxItem Text="Trazadone 150 mg" />
                    <telerik:RadComboBoxItem Text="Vitamin D2 50,000 units" />
                </Items>
            </telerik:RadComboBox>
            <label>SelectedIndex</label> <asp:Label ID="Label1" runat="server" Text=""></asp:Label>

Test.aspx.cs
        protected void rcb_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
        {
            Label1.Text = rcb.SelectedIndex.ToString();
            rcb.SelectedIndex = 0;
        }

<tr>
    <th style="text-align: right; vertical-align: top;">
        <asp:Label ID="lblQuestion" runat="server" Text="Question"></asp:Label>
    </th>
    <td style="text-align: left; vertical-align: top;">
        <telerik:RadEditor ID="redQuestion" runat="server" EditModes="Design" Skin="Bootstrap" ToolsFile="~/EditorTools.xml" Width="100%" Height="150px" BorderStyle="Solid" BorderColor="Black" BorderWidth="1">
        </telerik:RadEditor>
    </td>
</tr>

<style type="text/css">
.reToolZone table tr
{
    display: block !important;
}
</style>

Private Sub creaTV(ByVal user As String)
        Dim acdo As New SiteWeb.AccesDonnees
        Dim rdro As SqlDataReader

        RTV_menuUtilisateur.Nodes.Clear()

            rdro = acdo.RetournerDataReader("SELECT Identifiant, Libelle FROM lobdjetBDD " _
                            & "WHERE Parent is null AND NomUser='" & Trim(user) & "' ORDER BY Libelle,Parent", "EU_BREST")
         
            Do While rdro.Read
                Dim NewNode As New RadTreeNode(rdro(1), rdro(0))
                NewNode.ExpandMode = TreeNodeExpandMode.ServerSide
                NewNode.Expanded = False
                RTV_menuUtilisateur.Nodes.Add(NewNode)
            Loop
            rdro.Close()
            acdo.Dispose()
End Sub

Protected Sub RTV_menuUtilisateur_NodeExpand(sender As Object, e As RadTreeNodeEventArgs) Handles RTV_menuUtilisateur.NodeExpand
        Dim acdo As New SiteWeb.AccesDonnees
        Dim rdro As SqlDataReader
        Dim user As String
        user = DDL_utilisateur_menu.SelectedValue 'this is a combobox with a list of users, ignore it in your tests

        rdro = acdo.RetournerDataReader("SELECT Identifiant, Libelle, LienPage FROM lobdjetBDD WHERE Parent = " _
                                                    & e.Node.Value & " AND NomUser='" & Trim(user) & "' ORDER BY Libelle,Parent", "EU_BREST")
            
            Do While rdro.Read
                Dim NewNode As New RadTreeNode(rdro(1), rdro(0))

                    NewNode.ExpandMode = TreeNodeExpandMode.ServerSide
                    e.Node.Nodes.Add(NewNode)
            Loop
            rdro.Close()
            acdo.Dispose()
    End Sub

Protected Sub RadListBoxSource_MM_Transferred(sender As Object, e As RadListBoxTransferredEventArgs) Handles RadListBoxSource_MM.Transferred
        SortRadListBoxes_MM
    End Sub

    Protected Sub RadListBoxDestination_MM_Transferred(sender As Object, e As RadListBoxTransferredEventArgs) Handles RadListBoxDestination_MM.Transferred
        SortRadListBoxes_MM()
    End Sub

    Private Sub SortRadListBoxes_MM()
        RadListBoxSource_MM.Sort = RadListBoxSort.Ascending
        RadListBoxSource_MM.SortItems()

        RadListBoxDestination_MM.Sort = RadListBoxSort.Ascending
        RadListBoxDestination_MM.SortItems()
    End Sub

<telerik:RadListBox RenderMode="Lightweight" runat="server" ID="RadListBoxSource_MM" 
                        Height="200px" Width="100%" Skin="Material"
                        AllowTransfer="true" TransferToID="RadListBoxDestination_MM"
                        ButtonSettings-AreaWidth="35px">
</telerik:RadListBox>

<telerik:RadListBox RenderMode="Lightweight" runat="server" 
                    ID="RadListBoxDestination_MM" Height="200px" Width="100%"
                    ButtonSettings-AreaWidth="35px" Skin="Material">
</telerik:RadListBox>

  protected void RadGrid1_ItemDataBound1(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridDataItem)
        {
            GridDataItem item = (GridDataItem)e.Item;
            string s = item["photoid"].Text;
            if (s == null || s == string.Empty || s == "" || s.Length < 2 || s == "&nbsp;")
            {
                //code
            }
            else
            {
               //code
            }
        }
    }