C# class to JSON

Hi,

is there an easy way to serialize an C# class to an JSON-object?

 public class UserData {
     public string username;
     public string password;
     
     public UserData(string username,string password) {
         this.username=username;
         this.password=password;
     }
 }

should later look like as JSON: { "username":"abc", "password":"xxx" }