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Hello World API (.NET Framework)

This tutorial will show how to create a myAvatar ScriptLink-compatible API with .NET Framework.

Before You Begin

You will need the following to complete this tutorial:

When using Visual Studio you will want the following workloads and components installed.

  • ASP.NET and web development workload.
  • .NET Framework 4.8.1 SDK (if not already included with the install of the above workload)
  • .NET Framework project and item templates (if not already included with the install of the above workload)

Create Project

  1. Launch Visual Studio 2022.
  2. Create a new project.
  3. Select C# and then search for ASP.NET.
  4. Select ASP.NET Web Application (.NET Framework) and then select Next.
  5. Configure your new project.
    1. Set your project name.
    2. Select the location to store your project.
    3. Set your solution name.
    4. Don't check Place solution and project in the same folder. we will be adding additional projects to this solution in other tutorials.
  6. Select Next.
  7. Set the Framework to .NET Framework 4.8.1.
  8. Select Create.
  9. Select the Empty project template and the following recommend settings:
    1. Configure for HTTPS.
    2. Also create a project for unit tests
  10. Select Create.

Add Dependencies

We will add the RarelySimple.AvatarScriptLink package to our project.

  1. Right-click on the soution in Solution Explorer and select Manage NuGet Packages for Solution....
  2. Select Browse and search for AvatarScriptLink. Select RarelySimple.AvatarScriptLink by Scott Olson Jr and install this in your project.
  3. Select the Install tab, clear the search text and confirm you now have the package installed in your project.
  1. Right-click on your web application project and select Add->New Folder.
  2. Name the folder api.
  3. Add a new Web Service (ASMX) to this folder named ScriptLinkService.asmx. (Select Show All Templates if needed.)
  4. Implement the GetVersion and RunScript methods as shown below.
using RarelySimple.AvatarScriptLink.Objects;
using System.Web.Services;

namespace ScriptLinkHelloWorldDemo.api
/// <summary>
/// Summary description for ScriptLinkService
/// </summary>
[WebService(Namespace = "")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class ScriptLinkService : System.Web.Services.WebService
public string GetVersion()
return "0.1.0";

public OptionObject2015 RunScript(OptionObject2015 optionObject, string parameter)
return optionObject.ToReturnOptionObject(ErrorCode.Alert, "Hello World!");

Run Application

  1. Press F5 to run the service in your default browser.

Congratulations! You should now see your API showing in the browser and are ready to make the API calls.

You can get the WSDL for import to myAvatar by appending the address with ?WSDL. For example, https://localhost:44376/api/ScriptLinkService.asmx?WSDL.