Question: I am so confused that I thought to ask you for your opinion.

I have written few jquery code with asp.net. But there is group of developer in my company who think that javascript/jquery can be turned off and is insecure

* if javascript is insecure, why to use it at the first place
* what are the advantages of using jquery with asp.net apart from cross-browser. why not use javascript?
* should i use jquery in my asp.net applications?

There were a few posts over here that contained similar question, but not even one that contained good explanation. Please share your thoughts.

Answer: 
> 
> if javascript is insecure, why to use it at the first place
> 
> 
> 

To provide advanced browsing experience to those who have it on.

> 
> what are the advantages of using jquery with asp.net apart from cross-browser. why not use javascript?
> 
> 
> 

Rapid development. If you're not comfortable with jQuery, code in JavaScript directly, see no problem here.

> 
> should i use jquery in my asp.net applications?
> 
> 
> 

That's up to you to decide. Give it a try and see if you'll like it.
Javascript is not insecure per se -- but you can certainly create insecure code with it, if you're not careful. All code that is 'critical' security-wise should be run **in the server**, not in the user's browser, because it can be turned off.