>>I have another question. There is another button on that form of type submit which becomes available when the value is selected.
>>
>>Do you think if I try to programmatically call the click of that button, the form will submit or most likely not?
>>
>>In other words, for now I changed the type of my button back to button but I need to somehow figure a way to submit the form after the original code of that button is executed and the value is selected.
>
>You can programmatically create and\or click a submit button.

Thanks - and it will submit the form, right? This sounds like an easier solution for my case, I think.

I already made some code changes so the postback will not produce the error, but I also test just attempting to call click on my other button.