TypeCasting Error in Wizard

[Christopher Weaver]

The data form wizard created this:

public void LoadDataSet()
{
FollowUpApp.dsA ssignedTo objService;
objService = new FollowUpApp.dsA ssignedTo();
// Create a new dataset to hold the records returned from the call to
FillDataSet.
// A temporary dataset is used because filling the existing dataset would
// require the databindings to be rebound.
FollowUpApp.dsN ames objDataSetTemp;
objDataSetTemp = new FollowUpApp.dsN ames();
try
{
// Attempt to fill the temporary dataset.
objDataSetTemp = ((FollowUpApp.d sNames)(objServ ice.Clone()));

It crashes with an 'invalid cast' exception on the last line shown. I've
examined the .xsd for both dsNames and dsAssignedTo and they are identical.
When I created this form using the wizard it asked if I wanted to use an
existing ds and I chose dsAssignedTo.

Any ideas on why the 'invalid cast' exception and what to do about it?