<tr>
   <td>
      <asp:Label ID="lblFolderPath" runat="server" Width="75px" Text="Folder Path: " ></asp:Label>

      <ToolTip1>
         <telerik:RadDropDownList ID="ddlFolderPath" runat="server" Skin="Windows7" 
            Width="650px" Height="23px" AutoPostBack="True" 
            onClientSelectedIndexChanged="loadingAnimation">
            <Items>
               <telerik:DropDownListItem runat="server" DropDownList="ddlFolderPath " Text="" />
            </Items>
         </telerik:RadDropDownList>
      </ToolTip1>
   </td>
</tr>

Select Case GetMMRCode("CueSheetImportSegmentRoot", CurrentSide, ReturnTable) 'CurrentSide = DEV
   Case 0
      '// Get ddl choices from DB
      ddlFolderPath.Items.Clear()  'Prevent do items.add multiple times

      For Each row As DataRow In ReturnTable.Rows
         ddlFolderPath.Items.Add(New DropDownListItem(CType(row.Item("Opt1"), String), CType(row.Item("Code"), String)))  
     Next
End Select

<AdvancedInsertTemplate>
   <div class="rsAdvancedEdit rsAdvancedModal" style="position: relative; height: 300px;">
       <div class="rsModalBgTopLeft">
       </div>
       <div class="rsModalBgTopRight">
       </div>
       <div class="rsModalBgBottomLeft">
       </div>
       <div class="rsModalBgBottomRight">
       </div>
       <div class="rsAdvTitle">
           <h1 class="rsAdvInnerTitle">
               <%# Container.Appointment.Owner.Localization.AdvancedEditAppointment %></h1>
           <asp:LinkButton runat="server" ID="LinkButton1" CssClass="rsAdvEditClose"
               CommandName="Cancel" CausesValidation="false" ToolTip='<%# Container.Appointment.Owner.Localization.AdvancedClose %>'>
               <%# Container.Appointment.Owner.Localization.AdvancedClose%>
           </asp:LinkButton>
       </div>
       <div class="rsAdvContentWrapper">
           <div class="form-horizontal">
               <div class="form-group">
                   <label class="col-md-2 control-label">Subject</label>
                   <div class="col-md-10">
                       <asp:TextBox runat="server" ID="AppointmentSubject" CssClass="col-md-10 form-control" />
                   </div>
               </div>
               <div class="form-group">
                   <label class="col-md-2 control-label">Start time:</label>
                   <div class="col-md-10">
                       <telerik:RadDateTimePicker RenderMode="Lightweight" ID="StartTime" SelectedDate='<%# DateTime.Now.Date %>' runat="server"
                           EnableSingleInputRendering="false" />
                   </div>
               </div>
               <div class="form-group">
                   <label class="col-md-2 control-label">Doctor:</label>
                   <div class="col-md-10">
                       <asp:DropDownList runat="server" ID="DoctorsList"
                           CssClass="form-control" />
                   </div>
               </div>
               <div class="form-group">
                   <label class="col-md-2 control-label">Patient Name:</label>
                   <div class="col-md-10">
                       <asp:DropDownList runat="server" ID="PatientsList"
                           CssClass="form-control" />
                    </div>
               </div>
           </div>
           <asp:Panel runat="server" ID="Panel1" CssClass="rsAdvancedSubmitArea">
               <div class="rsAdvButtonWrapper">
                   <asp:LinkButton CommandName="Insert" runat="server" ID="LinkButton2" CssClass="rsAdvEditSave">
                       <span><%# Container.Appointment.Owner.Localization.Save%></span>
                   </asp:LinkButton>
                   <asp:LinkButton runat="server" ID="LinkButton3" CssClass="rsAdvEditCancel" CommandName="Cancel"
                       CausesValidation="false">
                       <span><%# Container.Appointment.Owner.Localization.Cancel%></span>
                   </asp:LinkButton>
               </div>
           </asp:Panel>
       </div>
   </div>
</AdvancedInsertTemplate>

protected void RadScheduler_FormCreated(object sender, SchedulerFormCreatedEventArgs e)
{
	if (e.Container.Mode == SchedulerFormMode.AdvancedEdit || e.Container.Mode == SchedulerFormMode.AdvancedInsert)
	{
		var doctorsDropdown = e.Container.FindControl("DoctorsList") as DropDownList;
		_doctorsList = doctorsDropdown;
		var patientsDropdown = e.Container.FindControl("PatientsList") as DropDownList;
		_patientsList = patientsDropdown;
		DoInitialBindings(doctorsDropdown, patientsDropdown);
		e.Appointment.End = e.Appointment.Start.AddHours(1);
	}
}
private void DoInitialBindings(DropDownList doctorsList, DropDownList patientsList)
{
   var doctorHelper = new DoctorsHelper();
   var doctorItems = new List<DoctorsViewModel>();
   var patientHelper = new PatientsHelper();
   var patientItems = new List<PatientsViewModel>();
   // Gets all the doctors and patients relevant to the Medical Practice
   // where the user is a receptionist.
   if (Roles.IsUserInRole(nameof(UserRole.Receptionist)))
   {
       int.TryParse(Request.Cookies["lcyduh"]["practice"], out int practiceId);
       doctorItems = doctorHelper.ListItemsForParent(practiceId);
       foreach (var doctor in doctorItems)
       {
           patientItems.Add(patientHelper.ListItemsForDoctor(doctor.Id));
       }
   }
   doctorsList.DataSource = doctorItems;
   doctorsList.DataTextField = "Name";
   doctorsList.DataValueField = "Id";
   doctorsList.DataBind();
   patientsList.DataSource = patientItems;
   patientsList.DataTextField = "Firstname"; // Firstname and Lastname fields are concatenated into the Firstname field by the helper function that retrieves the data.
   patientsList.DataValueField = "Id";
   patientsList.DataBind();
}