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namespace DrawLineTest
{
public partial class Form1:Form
{
InitializeComponent();
}
public Point beginpoint=new Point();
public Pen p = new Pen(Color.Green);
private void Form1_MouseDown(object sender,MouseEventArgs e)
{
beginpoint.X=e.X;
beginpoint.Y=e.Y;
}
private void Form1_MouseUp(object sender,MouseEventArgs e)
{
Point endpoint = new Point();
endpoint.X=e.X;
endpoint.Y=e.Y;
Graphics g = this.CreateGraphics();
g.DrawLine(p,beginpoint,endpoint);
}
}