Avoiding ASP.NET dropdownlist has a selectedvalue which is invalid exceptions

It is often to difficult to capture the following ASP.NET dropdownlist error when the dropdownlist is bound to an sqldatasource:  Dropdownlistname has a SelectedValue which is invalid because it does not exist in the list of items  This exception is frequently caused by poor validation controls during data entry and/or poor database design. For example, the previous [...]

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Referencing controls such as a combo box in a subform for use in query criteria or VBA is not very intuitive. Here is a great concise article that explains how to do it: http://blogs.techrepublic.com.com/msoffice/?p=188

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