C#

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"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius

<br />
public void OnPaint(object sender,PaintEventArgs e)<br />
{<br />
Graphics g=this.CreateGraphics();<br />
Pen pen=new Pen(Color.Magenta);<br />
Point p1=new Point(index1,index2);<br />
Point p2=new Point(index3,index4);<br />
g.DrawLine(pen,p1,p2);<br />
this.ResetMouseEventArgs();	<br />
}<br />
//Mouse Up and Down Events<br />
public void mouseUp(object sender,MouseEventArgs e)<br />
{<br />
index3=e.X;index4=e.Y;		<br />
this.Paint+=new PaintEventHandler(this.OnPaint);	<br />
Invalidate();<br />
}<br />
public void mouseDown(object sender,MouseEventArgs e)<br />
{<br />
index1=e.X;index2=e.Y;					<br />
}<br />