"Invalid URL Passed" exception while creating customer contact in Zoho books using rest API.

"Invalid URL Passed" exception while creating customer contact in Zoho books using rest API.

Hi Experts,

We are using .Net c# code to create a customer contact in Zoho books using Zoho books Rest API.But we are getting " Invalid URL Passed" exception.
Please find the attached sample code screenshot "Customer_Contact.png" for your reference.,

It seems that JSONString is not passed correctly. Could you please let us know how to pass the JSONString.
It would be a great help if someone provide a sample code for creating the customer.

Thanks in Advance.

Regards
Amit