C# SQLExpress SqlDataAdapter.Update method doesn't work

[HendrikVis]

Help!

I have created a simple SQL database from the solution explorer (visual studio 2005). My table has a primary key assigned. I can manually add rows and programatically read the rows. I try to edit, add, or delete a row using the following code: (delete shown here)

DataSet dataSet = new DataSet();
int count = sqlDataAdapterActivityLog.Fill(dataSet);
DataTable table = dataSet.Tables["CanMessages"];
DataRow row = table.Rows[0];
row.Delete();
if (dataSet.HasChanges())
{
DataSet changes = dataSet.GetChanges();
count = sqlDataAdapterActivityLog.Update(changes);
}

Not shown are the safety issues but the count from the fill command returns the correct number of rows. The data in the row is that of my manual entry. The count parameter from the Update call also indicates proper operation ( returns a 1) yet nothing happens in the database. What kind of synchronization am I missing?
Further note: There is an update, delete, and insert command assigned to the adapter - which indicates that all works fine by the return count.