A string specifying the name of the source column mapped to the DataSet and used for loading or returning the value.
When SourceColumn is set to anything other than an empty string, the value of the parameter is retrieved from the column with
the SourceColumn name. If Direction is set to Input, the value is taken from the DataSet. If Direction is set to Output, the
value is taken from the data source. A Direction of InputOutput is a combination of both.