Rick,

Here's the steps you need to do:

1) Databind your controls ... it sounds like you've done this already.

2) Before running the .Update() method, you need to verify that all proposed changes have been marked as modified rather than proposed ... there are two ways of doing this:

// for each table:
this.BindingContext[MyDataTable}.EndCurrentEdit();

or

for (int i=0; i < MyDataSet.Tables.Count; i++)
{
  for (int j=0; j < MyDataSet.Tables[i].Rows.Count; j++)
  {
    if (MyDataSet.Tables[i].Rows[j].HasVersion(DataRowVersion.Proposed))
      MyDataSet.Tables[i].Rows[j].EndEdit();
  }
}

I've had problems occasionally with the simpler method above (and it may just be something I didn't understand in the earlier days), and so I do the other one instead.

3) After the .Update() completes successfully, the do:

MyDataSet.AcceptChanges();

Hope that helps,
~~Bonnie