How to Count the number of contact using Trigger in Salesforce?

Hello Adarsh,

It’s easier to read the code if you use the <> and paste code in there, then you can also refer to the line in the code the error is pointing to. There is a blog post out there that might help you out:
http://www.infallibletechie.com/2013/09/trigger-to-count-number-of-contacts.html