problem to write data to the database

[qfchen]

I have a data table in the database, initially it's only one parameter, called "department ", later I'd like add another parameter, called "person". I was able to read both "department " and "person", I can also modify "department ", but I can't wrist to "person", I had checked the dataSet, and its property, still can't figure out this problem.Here are the code to update the database.

Me.Employee_DataSet.Department.Rows(cboDepartment.SelectedIndex).Item(0) = txtDepartment.Text
Me.Employee_DataSet.Department.Rows(cboDepartment.SelectedIndex).Item(1) = txtPerson.Text
Me.DepartmentTableAdapter.Update(Me.Employee_DataSet.Department)
Me.DepartmentTableAdapter.Update(Me.Employee_DataSet)