TextBox.Text Changing Unexpectedly

I'm updating a LINQ object prior to SubmitChanges. The values of the object's properties are being taken from a series of TextBoxes.

When I read in one specific TextBox, another TextBox changes its value with no apparent cause.

//...
loc.Lattitude = txtLocLat.Text; // txtLocLong.Text changes to previous value
loc.Longitude = txtLocLong.Text; // Which is now the previous value
dc.SubmitChanges();
// ...

As a result, loc.Longitude never gets updated with the user input. Why would it do this?

• The TextBoxes have no databindings
• The TextBoxes have no events defined
• Breakpointing into the first line merely steps through the DataContext's loc.Lattitude setter.

Try putting a breakpoint on the txtLocLong TextChanged event and see if the stack trace is any help.