Hi,

You are going to get this error because you are attempting to instantiate an object that is different from the one that you declared.

You entered:

Touchpos_SQL_serverDataSet.Transaction_HeaderRow Row = new Touchpos_SQL_serverDataSet.Transaction_HeaderDataTable();

Perhaps you should have entered:

Touchpos_SQL_serverDataSet.Transaction_HeaderRow Row = new Touchpos_SQL_serverDataSet.Transaction_HeaderRow();

regards

Shaun