If you ever get this error message trying to build a SqlMetaData object:

	The dbType NVarChar is invalid for this constructor.
	The dbType VarChar is invalid for this constructor.

and you have something that looks like:

	new SqlMetaData("SomeColumnName", SqlDbType.NVarChar)

For data type `int` this is ok, but NVarChar and VarChar require an extra parameter

	new SqlMetaData("SomeColumnName", SqlDbType.NVarChar, 50)

w00t.