powershell form variables write into batch file

Hi
I am creating a dataentry form (attached)  where I am trying to get values using the powershell form and write it into a batch file or text file in a specific way.

Attached is the ps script to collect values.

When I click ok button the event handler should ideally store value into $x which I should be able to write into file but I am unable to get it into a file.

I want the end result to be such that each variable from the fields should be written in the following format in a batch file

Something like set-content into a batch file

The outfile of file written should be :

set dbname=<database name from form>
set username=<Database login from form>
set dbservername=<selection from list box>
set inpwait=<true if check box is selected>

If you could give me an example for text box, listbox and checkbox i.e retrieving values into file when I click ok button. That would be great!

If you need more info please let me know.

Thanks
powershellform