How to call stored procedure in EF4?

You cannot fix it. It is a gotcha. Result set must be materialized or thrown away before output parameters are accessible because these output parameters are transferred in the last result set so internal data reader must first read the returning result set with main data and then access the next result set to read output parameters.

Btw. It is the same if you use ADO.NET directly - that is not a feature of Entity framework itself but the way how SQL server returns output parameters and the way how DataReader consumes result sets in sequential order.

When you call procedure or query that returns a table of rows EF does real execution when user calls ToList or enumerate the return value.

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