The name of the source column that will be used to set the value of this parameter. The default value is an empty string ("").
Remarks
When SourceColumn property 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 System.Data.DataSet. If Direction is set to Output, the value is taken from the data source. A Direction of InputOutput is a combination of both.