C# SDK for Zoho CRM APIs

The C# SDK for Zoho CRM allows developers to easily create C# applications that can be integrated with Zoho CRM. It serves as a wrapper for the Zoho CRM REST APIs, making it easier to access and utilize the services of Zoho CRM.

Authentication to access the CRM APIs is facilitated through OAuth2.0, and the authentication process is streamlined through the use of the C# SDK. The grant and access/refresh tokens are generated and managed within the SDK code, eliminating the need for manual handling during data synchronization between Zoho CRM and the client application.

The latest version of C# SDK (v4.0.0) supports version 6 of Zoho CRM APIs. For more information on the released C# SDK versions, refer here.


  • Ensure that the client app has .NET Framework 4.6.1 or above.
  • An IDE such as Visual Studio Code or Eclipse
  • Zoho CRM account.

Step 1: Register your application

Before you get started with authorization and make any API calls using the Zoho CRM C# SDKs, you need to register your application with Zoho CRM.

  1. Go to Zoho Developer console and click on Add Client
  2. Choose the client type as Self Client or Server-based Applications depending on your requirements.
  3. Enter the required credentials.
  4. Click CREATE
  5. Make a note of the Client ID and Client Secret generated for your application.

register a client

Step 2 : Create a project and add C# SDK in your project.

In this step, you'll create a new project in your preferred IDE and add the C# SDK in your project. We will be using Visual Studio Code IDE in this guide.

  1. Create a project in your preferred IDE
  2. Install C# SDK using the Nuget Package Manager. For version 6, install the ZOHOCRMSDK-6.0 package.

create C# project and add dependencies

Step 3 : Generation of Grant token

Generate a grant token from the Zoho Developer Console by following the steps described in this page.

generate grant token

Step 4: Configuration and Initialization

In the configuration step, you will set up details such as user authentication, environment, token persistence, logging, and API call timeout settings. The following table gives the details of all the keys you can configure, with detailed explanation.

Represents the domain information to make API calls in Domain.Environment pattern.
Domains: USDataCenter, EUDataCenter, INDataCenter, CNDataCenter, AUDataCenter
Environment environment = USDataCenter.PRODUCTION;
Contains user token details. Depending on the tokens, you can choose grantToken flow, refreshToken flow, or accessToken flow.IToken token = new OAuthToken.Builder() .ClientId("clientId") .ClientSecret("clientSecret") .GrantToken("grantToken") .RedirectURL("redirectURL") .FindUser(false)// by default true .Build();
Contains the configuration for logging exceptions and API call information. By default, the logs will be available in the workspace as sdk_logs.log.Logger logger = new Logger.Builder() .Level(Logger.Levels.ALL) .FilePath("/Users/user_name/Documents/csharp_sdk_log.log") .Build();
Contains details for the Token Persistence object. You can choose between DB Store, File Store, or Custom Store and configure accordingly. To know more about token persistence, refer here.ITokenStore tokenstore = new FileStore("absolute_file_path");
Contains additional configuration details like timeout, autorefresh fields, picklistvalidation, etc.SDKConfig config = new SDKConfig.Builder() .AutoRefreshFields(false) .PickListValidation(true) .Timeout(10) .Build();
Contains the details of the proxy if you are using a proxy server to authenticate and make the API calls.RequestProxy requestProxy = new RequestProxy.Builder() .Host("proxyHost") .Port(proxyPort) .User("proxyUser") .Password("password") .UserDomain("userDomain") .Build();
The path containing the absolute directory path to store user-specific files containing the module fields information.String resourcePath = "/Users";

For detailed instructions on how to configure the above keys and get started, refer here. Find a sample code for initialization here.

SDK initialization

Step 5 : Making requests using C# SDK

After you have configured and initialised, you can start making your requests using C# SDK and utilise the functionalities of Zoho CRM. Here is a sample code to insert a new record in to the Leads module.

Making API calls

Responses and Exceptions

When working with the Zoho CRM C# SDK, it is important to understand the responses and exceptions that can be encountered during API calls.


  • The APIResponse object holds the results of your request. You can access the actual response data using the Object method.
  • The APIResponse<ResponseHandler>and APIResponse<ActionHandler> are the common wrapper objects for handling responses from Zoho CRM APIs. This depends on the API. For more details, refer here.
  • APIException: This exception is thrown for errors that are related to the API itself, such as authentication errors or invalid request parameters.
  • SDKException: This exception is thrown for errors that are related to the Zoho CRM SDK, such as network errors or SDK implementation errors.

For more details on the Responses and Exceptions, refer here.

Older versions

v5 APIs
v2.1 APIs
v2 APIs