What's your code look like, Alex? You will find posting at least a portion of it will help get you what you need. Also, poting in the .Net forum will get you beter, sound results...
Another recommendation. Where possible, copy and paste things like messages. If you have to type them in, be very precise. A typo (such as "requires" in this example) in the wrong place could change the meaning of a message, or cause a search to miss something.
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