How to Use C# Set Value for Tab Page

[yozoo]

Hi guys, would you please tell me How to Use C# Set Value for these:



Because some website the value for form is "0", but some is "1"

the HTML code is:



Thank you for your help!

 

[Hungry Bulldozer]

Wondering if that's "1", not "0" sometime because of hidden element on the page or soemthing like this?

 

[rostonix]

Use -1 to make search through all forms