How to create a record in Zoho CRM by using C# API?

How to create a record in Zoho CRM by using C# API?

So, I found a code for how to create a record with C# in Zoho: https://www.zoho.com/crm/developer/docs/csharp-sdk/record-samples.html

The code, which is written there is not working for me. I already talked with support and they sent me this link: https://www.zoho.com/crm/developer/docs/csharp-sdk/v2/files-samples.html?src=get_file, which can not give me an answer to my problem.

So, that's how it looks like when I'm taking the code from the first link. I installed the NuGet package.
From the first link, create a record
These fields I would like to create in my Zoho CRM for contacts
My main question is: 
Does anyone know how to create a record with C# API in Zoho CRM? 

Thank you in advance!