Webservice SoapException when targeting Framework 4

I'm trying to convert our application from framework 2 to framework 4 using VS2010 and am encountering the following error at the very first call to get data via a webservice call:

A first chance exception of type 'System.Web.Services.Protocols.SoapException' occurred in System.Web.Services.dll
System.Web.Services.Protocols.SoapException: Server was unable to read request. ---> There is an error in XML document (1, 1632). ---> Column requires a valid DataType.
   at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) ...

Code worked fine in framework 2.  I profiled the database and the call never makes it there.  Any ideas on how to debug this error?
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Erick37Asked:
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käµfm³d 👽Connect With a Mentor Commented:
You typically don't have to be concerned with "first chance" exceptions as they are exceptions being handled gracefully by the runtime during debugging. See this blog entry for a description of first chance exceptions.

Are you saying it doesn't work at all (disregarding the first chance exception)?
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Erick37Author Commented:
If I ignore the exception, the returned value of the webservice call (dataset) is Nothing.
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Erick37Author Commented:
The problem was resolved by targeting our webservice to Framework 4.  We use datatables extensively in the webservice to pass in parameters and I believe it was the differences in the datatable structures between f/w 2 and f/w 4 which caused the issue.
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