Draw a line pixel by pixel using C#

You mean to say you want to connect two points pixel by pixel so it seems like a line?

This should get you started in the right direction...
Create a simple C# windows application.
Drop a button on the form in the lower righthand corner.
On the button click event handler for the button put this code:
Pen BlackPen = new Pen(Color.Black, 2);
System.Drawing.Graphics ThisFormsGraphics = this.CreateGraphics();
ThisFormsGraphics.DrawLine(BlackPen, 50, 50, 35, 35);

maybe i am not clear, i know i can use a Drawline Function to plot a line, but i need a progressive line (which plots the line pixel by pixel) this i believe cannot be achieved by the DrawLine function

Ahh, so in abstract terms, you need to be able to draw a line from one point to another point but slowly, pixel by pixel. In other words, the user would see the line slowly getting drawn from one point to the other. I also assume the line will not always be a nice verticle or horizontal line.
Am I on the right track now?

Hi sorry for the delay in response. I tried the code above, works well with a single line. but when i tried to use it in my application there is a problem. i need to draw two or more lines (continous) pixel by pixel, but after drawing the second line line the previous line disappears. Any suggestions how do i solve it?

Well...then you need to use an Array, ArrayList, or other structure to hold multiple pieces of data.

All of these variables need to be in that structure:

        private Point ptA = new Point(50, 50);
        private Point ptB = new Point(250, 125);
        private int deltaX;
        private int deltaY;
        private int curDist = -1;
        private int distance = -1;

Then you simply iterate over the structure and perform the same technique above on each one.  If you want you could even write a class to encapsulate the data...

Thanks Idle Mind