Symptom

On deploying a newly precompiled web site, the error message as displayed by ASP.NET is as follows:

Line 1:  <%@ control language="C#" autoeventwireup="true" enableviewstate="false" inherits="WebSiteControls_Offers_TypeFilter, App_Web_typefilter.ascx.bd9a439f" %>

Line 2:  
Line 3:  <%--

System Information

This may or may not be relevant, but it reflects my set up at the time I discovered this issue.

• Web Site project
• Visual Studio 2008
• .NET 3.5
• IIS 6.0

Reason

The reason for this is that a control, in this case a Repeater, in the User Control had a similar name as a field on the code behind. The only difference between the two the case. One was called “offerTypes” (in the code behind, an IEnumerable containing entities from the business layer), the other “OfferTypes” (a ASP.NET Repeater control).

Solution

Rename one or other so that the names differ by more that case alone. In my case, I renamed the field referring to the entities to offerTypeInformation.