delay in drawing

Hello all
I have a question and hope u help me
i want to draw simple line using c#
but i want the drawing as animation
for example in c language i used delay()
to present the drawing as animated

Graphics g = this.CreateGraphics() ;
Pen pn = new Pen( Color.Blue );
int k=0,j=0;
for (int i =0 ;i<50;i++)
{
Point pt1 = new Point( k, j);
Point pt2 = new Point( k+10, j+10);
g.DrawLine( pn, pt1, pt2 );
k+=5;
j+=5;
}
i want delay between each loop becuase i need it as animated
help me if u can plz

Add this at the last line inside the loop (not perfect but it works)

System.Threading.Thread.Sleep(50);