sing System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
 
 
namespace GraphCApplication1
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		int i=0, x, y;
		String s = "";
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
 
		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();
 
 
			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}
 
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}
		protected override void OnPaint(PaintEventArgs e)
		{
			base.OnPaint (e);
		}
 
		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		/// 
		public void mouseDownForm(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			Font f;
			SolidBrush br;
			Pen pn;
			Rectangle rct;
 
			switch(e.Button)
			{
				case MouseButtons.Left:
 
					x = e.X;
					y = e.Y;
					i++;
					s = i.ToString();
					//Graphics g = Graphics.FromHwnd(this.Handle);
					Graphics g = CreateGraphics();
					//Draw(g);
					//g.FillRectangle(new SolidBrush(this.BackColor), this.ClientRectangle);
					f = new Font("Arial", 14);
					br = new SolidBrush(Color.Red);
					pn = new Pen(Color.GreenYellow);
					rct = new Rectangle(e.X, e.Y, 50, 50);
					g.DrawEllipse(pn, rct);
					g.DrawString(s, f, br, rct);
 
					//MessageBox.Show(this, "click stanga");
					break;
				case MouseButtons.Right:
					/*if (RightClick != null)
					{
						RightClick(sender, e);
					}*/
					MessageBox.Show(this, "click dreapta");
					break;
			}
		}
		/*public void Draw(Graphics g)
		{
			Rectangle r = new Rectangle(x, y, 20, 20);
			g.DrawEllipse(new Pen(Color.Coral), r);
			g.DrawString(s, new Font("Arial", 10), new SolidBrush(Color.Coral), r);
		}*/
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			this.Size = new System.Drawing.Size(300,300);
			this.Text = "Form1";
			this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.mouseDownForm);
		}
		#endregion
 
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
	}
}

this.Invalidate()