c# Sendmessage click button API

See more:

C#

controls

API

calculator

, +

C# Visual Studio windows form...

I'm experimenting on how to access other applications. I want to be able to click other application buttons through my program.

I can't get this code right!
It should click the number 2 in the calculator, but it clicks the "," sign.

WinSpy++ shows that the CONTROL ID of the button 2 is 00000084

Here is the code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {

    [DllImport("user32.dll")]
    public static extern int SendMessage(int hWnd, uint Msg, int wParam, int lParam);

    [DllImport("user32.dll")]
    static extern int FindWindow(string lpClassName, string lpWindowName);



        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            const int WM_COMMAND = 0x0111;


            int thisWindow = FindWindow("CalcFrame", "Calculator");


            SendMessage(thisWindow, WM_COMMAND, 00000084, 0);

        }







    }
}