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Using UDL Files
The OLE DB .NET Data Provider supports Universal Data Link (UDL) file names in its connection string. You can pass the connection string by using construction arguments to the OleDbConnection object, or you can set the connection string by using the object's ConnectionString property.
Note The SQL Server .NET Data Provider does not support UDL files in its connection string. Therefore, this approach is available to you only if you are using the OLE DB .NET Data Provider.
For the OLE DB provider, to reference a UDL file with the connection string, use "File Name=name.udl."