How to handle exception of type errormessages in Jira Rest API using C# ?

[Shrinish]

{ "errorMessages": [], "errors": { "assignee": "User 'sdxwwr' does not exist." }}

Auth: Basic

Content/type: application/json

Could anyone give an example of how to handle exceptions of the kind stated above using C# ?

[Hasna]

Could you please check in you JIRA application whether user with name sdxwwr exist or not