The Official DocuSign C# Client Library used to interact with the eSign REST API. Send, sign, and approve documents using this client.
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Latest commit 44be74f Oct 15, 2018

The Official DocuSign C# Client

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Microsoft .NET version 4.5 or later.


  • .NET Standard 2.0. See .NET Standard Selector for details on versioning for the individual components in .NET Standard.
  • .NET Core 2.0
  • .NET Framework 4.5 or later
  • TLS 1.2


NuGet Package Manager

To add to a new or existing Visual Studio project:

1. Open project and go to Tools -> NuGet Package Manager -> Manage NuGet Packages for Solution.
2. Search for "DocuSign", select the DocuSign.eSign package, and click Install.  

Manual Install

Copy DocuSign.eSign.dll file to your local machine and add reference through your project settings.


Alternatively you can just copy the source code directly into your project.


This client has the following external dependencies:

  • Newtonsoft.Json.dll
  • RestSharp.dll
  • BouncyCastle
  • System.IdentityModel.Tokens.Jwt


To send a signature request from a template using OAuth JWT authentication:

using DocuSign.eSign.Api;
using DocuSign.eSign.Model;
using DocuSign.eSign.Client;
using System.Collections.Generic;
using DocuSign.eSign.Client.Auth;

namespace DocuSignSample
    class Program
        static void Main(string[] args)
            string userId = "[USER_ID]"; // use your userId (guid), not email address
            string oauthBasePath = "[OAUTH_BASE_PATH]";
            string integratorKey = "[INTEGRATOR_KEY]";
            byte[] privateKeyBytes = "[PRIVATE_KEY_BYTES] For Eg. File.ReadAllBytes("RSA_Key_File")"; // Create a byte array
            int expiresInHours = 1;
            string host = "";

            string accountId = string.Empty;

            ApiClient apiClient = new ApiClient(host);

            OAuth.OAuthToken tokenInfo = testConfig.ApiClient.RequestJWTUserToken(integratorKey, userId, oauthBasePath, privateKeyBytes, expiresInHours);  

            // STEP 1: Get User Info   
            // now that the API client has an OAuth token, let's use it in all// DocuSign APIs

            OAuth.UserInfo userInfo = apiClient.GetUserInfo(tokenInfo.access_token);
            foreach (var item in userInfo.Accounts)
                if (item.IsDefault == "true")
                    accountId = item.AccountId;
                    apiClient = new ApiClient(item.BaseUri + "/restapi");

            // STEP 2: CREATE ENVELOPE API        

            EnvelopeDefinition envDef = new EnvelopeDefinition();
            envDef.EmailSubject = "[DocuSign C# SDK] - Please sign this doc";

            // assign recipient to template role by setting name, email, and role name.  Note that the
            // template role name must match the placeholder role name saved in your account template.  
            TemplateRole tRole = new TemplateRole();
            tRole.Email = "[SIGNER_EMAIL]";
            tRole.Name = "[SIGNER_NAME]";
            tRole.RoleName = "[ROLE_NAME]";
            List<TemplateRole> rolesList = new List<TemplateRole>() { tRole };

            // add the role to the envelope and assign valid templateId from your account
            envDef.TemplateRoles = rolesList;
            envDef.TemplateId = "[TEMPLATE_ID]";

            // set envelope status to "sent" to immediately send the signature request
            envDef.Status = "sent";

            // |EnvelopesApi| contains methods related to creating and sending Envelopes (aka signature requests)
            EnvelopesApi envelopesApi = new EnvelopesApi(apiClient.Configuration);
            EnvelopeSummary envelopeSummary = envelopesApi.CreateEnvelope(accountId, envDef);

See CoreRecipes.cs for more examples.


Service Integrations that use Legacy Header Authentication

(Legacy Header Authentication uses the X-DocuSign-Authentication header.)

  1. Use the Authentication: login method to retrieve the account number and the baseUrl for the account. The url for the login method is for production and for the developer sandbox. The baseUrl field is part of the loginAccount object. See the docs and the loginAccount object
  2. The baseUrl for the selected account, in production, will start with na1, na2, na3, eu1, or something else. Use the baseUrl that is returned to create the basePath (see the next step.) Use the basePath for all of your subsequent API calls.
  3. As returned by login method, the baseUrl includes the API version and account id. Split the string to obtain the basePath, just the server name and api name. Eg, you will receive You want just
  4. Instantiate the SDK using the basePath. Eg ApiClient apiClient = new ApiClient(basePath);
  5. Set the authentication header as shown in the examples by using Configuration.Default.AddDefaultHeader

User Applications that use OAuth Authentication

  1. After obtaining a Bearer token, call the OAuth: Userinfo method. Obtain the selected account's base_uri (server name) field. The url for the Userinfo method is for the demo/developer environment, and for the production environment.
  2. Combine the base_uri with "/restapi" to create the basePath. The base_uri will start with na1, na2, na3, eu1, or something else. Use the basePath for your subsequent API calls.
  3. Instantiate the SDK using the basePath. Eg ApiClient apiClient = new ApiClient(basePath);
  4. Create the authentication_value by combining the token_type and access_token fields you receive from either an Authorization Code Grant or Implicit Grant OAuth flow.
  5. Set the authentication header by using Configuration.Default.AddDefaultHeader('Authorization', authentication_value)


Unit tests are available in the Test folder.


Feel free to log issues against this client through GitHub. We also have an active developer community on Stack Overflow, search the DocuSignAPI tag.


The DocuSign CSharp Client is licensed under the following License.