test.cs

namespace MyWrapper
{ 	
	public class Class1
    {
        public Class1()
        {
            TXTextControl.ServerTextControl.EntryAssembly = typeof(Class1).Assembly;
        }

        public string GetHtml()
        {
            using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl())
            {
                tx.Create();
                tx.Text = "Hello World!";

                var html = "";
                tx.Save(out html, TXTextControl.StringStreamType.HTMLFormat);
                return html;
            }
        }
    }
}