Developing an CSOM code using Visual Web Part

Hi,

I'm new to writing code on CSOM. i was trying to write CSOM on Visual Web part.

please, suggest is it possible to write CSOM on Visual web part.

I have tried the sample code for getting the web Title on label using CSOM, deployment has been completed succesfully, but when i try to add that web part on the page, throwing an erroraccess denied and issue is on line mentioned below.