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using System;
using System.Drawing;
using System.Windows.Forms;
namespace bttest
{
    static class Program
    {
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
public class Form1 : Form
{
Button button1;
public Form1()
{
    button1 = new Button();
    this.button1.Location = new System.Drawing.Point(25, 25);
    this.button1.Size = new System.Drawing.Size(100, 50);
    this.button1.Text = "button1";
    this.ClientSize = new System.Drawing.Size(284, 261);
    this.Controls.Add(this.button1);
    button1.MouseMove += MM; button1.MouseDown += MM;
    button1.MouseUp += MU;
    button1.MouseLeave += ML;
}
private void MM(object sender, MouseEventArgs e)
{
    Rectangle rect = button1.Bounds;
    Point p = e.Location; p.X += button1.Left; p.Y += button1.Top;
    if (e == null || e.Button != MouseButtons.Left || !rect.Contains(p)) { ML(null, null); return; }
    this.Text = "Mouse On";
}
private void MU(object sender, MouseEventArgs e)
{
    if (e == null || e.Button != MouseButtons.Left) return;
    ML(null, null);
}
private void ML(object sender, EventArgs e)
{ this.Text = "Mouse Off"; }
}
 
}
 

prog.cs(3,22): error CS0234: The type or namespace name `Forms' does not exist in the namespace `System.Windows'. Are you missing `System.Windows.Forms' assembly reference?
prog.cs(16,22): error CS0246: The type or namespace name `Form' could not be found. Are you missing an assembly reference?
prog.cs(18,1): error CS0246: The type or namespace name `Button' could not be found. Are you missing an assembly reference?
prog.cs(31,32): error CS0246: The type or namespace name `MouseEventArgs' could not be found. Are you missing an assembly reference?
prog.cs(38,32): error CS0246: The type or namespace name `MouseEventArgs' could not be found. Are you missing an assembly reference?
Compilation failed: 5 error(s), 0 warnings

Standard output is empty