That's because the table adaptors don't contain any data in the first place. The DataTables are what should be getting filled.
Where do you have that code and where are you calling it from?
Here's generally how we do it:
Dim ta As New MyTypedTableAdapter
ta.Connection = our_connection_Manager ' in your example, this would be myDataSetConnection
Dim dataMyNewDataTable As MyTypedDataTable = ta.GetData(Pass_Optional_Parameters_Here)
'Now my datatable has been filled
We usually wrap that up in a function that returns the appropriate type based on the data we're trying to load, and viola!