Postmand code not working

Iā€™m using postman stand alone app(v6.4.2). Iā€™m successfully able to call client api through postman. But when I try to same with C#(RestSharp) code snippet from ā€˜Codeā€™ section in my .net app. It wonā€™t act the same, rather it returns me 401(Unauthorized) from client.

Details

Screen - 1: You can find highlighted portion, where 200(OK) status received while call api via postman. In the popup same api code snippet available via postman. When Iā€™m trying to run that code in my application it wonā€™t work and returned 401(Unauthorized).
Screen - 2 : This is the fiddler screenshot which having provided request header using postman call.
Screen - 3 : Code provided by postman(from Screen - 1) execute from my application received this result in fiddler.
Screen - 4 : My application which Iā€™m debugging code provided by postman(from Screen - 1).

Having the same issue - request works in Postman app, but generated c# RestSharp code fails with ā€œStatusCode: Unauthorizedā€. Any suggestions? Thanks.