How use my c# method in to html page by javascript

Hello, people.

I have method MyMethod in class MyClass:

using System;
using System.Collections.Generic;
using System.Web;

///

/// Summary description for MyClass
///

public class MyClass : System.Windows.Forms.UserControl
{
  public  MyClass()
  {
   
  }

  public static string MyMethod()
  { return "some string"; }
}

And i want use this method in Html page by javascript. Tell me please, how call this method?