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This message appears when you drag items that do not use the .NET Framework Data Provider for SQL Server from Server Explorer or Database Explorer onto the LINQ to SQL tools in Visual Studio.
The O/R Designer supports only data connections that use the .NET Framework Provider for SQL Server. Only connections to Microsoft SQL Server or Microsoft SQL Server Database File are valid.
To correct this error, add only items from data connections that use the .NET Framework Data Provider for SQL Server to the O/R Designer.