I'm experiencing a problem with an app, and I'm not sure what I'm missing.

My app has two drop down lists. The second is populated depending on what
selection is made with the first.

The selected values of each box are then sent to a string, and this information is placed in an email message.

The problem is that the selected values of the form are not being retained when submitting the form. The only information that is being passed into the variables is the first item of each box. I'm sure this is related to postback, but I can't seem to find the problem. Any ideas?