C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using Microsoft.Win32;

namespace Editing_the_Registry
{
    class Program
    {
        static void Main(string[] args)
        {
            Microsoft.Win32.RegistryKey key;
            key = Microsoft.Win32.Registry.CurrentUser.CreateSubKey("Rajdeep");
            key.SetValue("MyString", "CreatedbyRajdeep");
            key.Close();
        }
    }
}

1.  htmlElement.innerText = htmlElement.innerText.Replace(htmlElement.innerText, "New Text");
           
2.           htmlElement.innerText = "New Text";

object obj = "New text";
           htmlElement.setAttribute("innerText", obj,0);