Select2 - The Ultimate jQuery Autocomplete with Ajax in .NET web forms

Hi All,
Can you please help me in using "Select2 - The Ultimate jQuery Autocomplete with Ajax in .NET web forms"?

I have tried https://www.codeproject.com/Articles/623566/Select-The-Ultimate-jQuery-Autocomplete but it is working fine in MVC but as soon as I converted the same into WEB forms the ajax call is not hitting the webmethod.

Normal ajax call without select is working fine but with select2 the ajax is not working.

Thanks for the help in advance.

Thanks,
Rajan