HTTP Verbs clarification

Question

 Hi,

I have below 2 questions:  

1. Suppose, I have an [HTTPGET] verb as an attribute of my method. However, inside this method instead of writing a logic to fetch the data, If I include the logic to POST/ Save the data will the  framework prevent me from doing this?

 

2. Can we create our own HTTP Verbs? 

 

 

Thanks!

Rohan