Custom Control - Error - The control must be assignable from - Sitefinity - Front- & Back-End Development

Posted by Community Admin on 22-Feb-2012 00:00

Hello. I am trying to implement a custom control and am getting this error:

A required control was not found in the template for "YRMC.Sitefinity.Resources.Views.Census.ascx". The control must be assignable from type "System.Web.UI.WebControls.Label" and must have ID "WCnt".

Here is the ASCX:

<asp:Table ID="MyCensus" runat="server">

<asp:TableRow>

<asp:TableCell ColumnSpan="2">West Campus</asp:TableCell>

</asp:TableRow>

<asp:TableRow>

<asp:TableCell>Census</asp:TableCell>

<asp:TableCell>% Capacity</asp:TableCell>

</asp:TableRow>

<asp:TableRow>

<asp:TableCell BackColor="Silver"><asp:Label ID="WCnt" runat="server" Text=" " /></asp:TableCell>

<asp:TableCell ID="TCWPcn" runat="server"><asp:Label ID="WPcn" runat="server" Text=" " /></asp:TableCell>

</asp:TableRow>

<asp:TableRow>

<asp:TableCell ColumnSpan="2">East Campus</asp:TableCell>

</asp:TableRow>

<asp:TableRow>

<asp:TableCell>Census</asp:TableCell>

<asp:TableCell>% Capacity</asp:TableCell>

</asp:TableRow>

<asp:TableRow>

<asp:TableCell BackColor="Silver"><asp:Label ID="ECnt" runat="server" Text=" " /></asp:TableCell>

<asp:TableCell ID="TCEPcn" runat="server"><asp:Label ID="EPcn" runat="server" Text=" " /></asp:TableCell>

</asp:TableRow>

</asp:Table>

As you can see there is a label called WCnt. Here is .cs code that the error is having an issue:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.Odbc;

using System.Drawing;

using System.Web.UI.WebControls;

using Telerik.Sitefinity;

using Telerik.Sitefinity.Modules.Pages.Web.UI;

using Telerik.Sitefinity.Web;

using Telerik.Sitefinity.Web.UI;

using Telerik.Web.UI;

namespace YRMC.Sitefinity.Web.UI

[RequireScriptManager]

public class Census : SimpleView

private Int32 PatientCount = 0;

private Double PatientPercentage = 0.0;

protected override string LayoutTemplateName

get return "YRMC.Sitefinity.Resources.Views.Census.ascx";

protected virtual Table MyCensus

get return this.Container.GetControl<Table>("MyCensus", true);

protected virtual Label WCnt

get return this.Container.GetControl<Label>("WCnt", true);

I am puzzled on this. Kameron

Posted by Community Admin on 22-Feb-2012 00:00

This might not be correct as I've never built my tables that way, but could it be that the Wcnt label is not accessible at design time because it's added to the MyCencus server control?

Similar to how you can't access items inside a repeater template directly, but instead have to do some kind of "FindControl"...

Have you tried doing something like MyCensus.Controls.FindControl("Wcnt")?

Again, this is just off the top of my head, so I might be wrong about how that works...

Posted by Community Admin on 23-Feb-2012 00:00

Thank you for this. I changed my code to do a find instead and also changed the table from being a .net table to a html table and now it is working.

Thanks again.

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Custom Control - Error - The control must be assignable from

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