Getting points from a .txt file and plotting them in a picturebox in C#

Question

I'm trying to build a windows form application in which I read a comma separated list from a .txt file and then plot that using the DrawLine function. My code keeps getting stuck in an infinite loop and I'm not sure how I should proceed further. I have no preference of how I should plot it and the only reason I'm using the drawline function is because I don't know of any other way so I'm open to any other ideas that might be better suited to doing this task.

       private void startToolStripMenuItem_Click(object sender, EventArgs e)
    {
        StreamReader sr = new StreamReader("../../sample.txt");
        string[] values = null;
        zee1 = sr.ReadLine();
        while (zee1 != null)
        {
            values = zee1.Split(',');
            x1 = Int32.Parse(values[0]);
            x2 = Int32.Parse(values[1]);
            y1 = Int32.Parse(values[2]);
        }



        //BackGroundBitmap.Save("result.jpg"); //test if ok
        Point point1 = new Point(int.Parse(values[0]), int.Parse(values[2]));
        Point point2 = new Point(int.Parse(values[1]), int.Parse(values[2]));

        pictureBox1.Enabled = true;
        g = pictureBox1.CreateGraphics();
        g.DrawLine(pen1, point1, point2);
    }

Please note I'm trying to plot two different values of x on the same plot for the same values of y. Also that values[0] is an array that contains all the data in the first column of the .txt file and so forth for values[1] and values[2].

The txt file I'm using is as follows

0,4,0

1,2,1

2,1,2

3,6,3

4,1,4

5,3,5

6,8,6

Answer 1

You're in an infinite while loop because the condition never changes. You need to update zee1 . The most popular way to do this is to simply update it in the condition:

while ((zee1 = sr.ReadLine()) != null)
{
    // what was here already
}

It also seems as if you want to draw a set of line segments (I assume one to the next), so you could do that like so:

private void startToolStripMenuItem_Click(object sender, EventArgs e)
{
    List<Point> points = new List<Point>();
    using (StreamReader sr = new StreamReader("../../sample.txt"))
    {
        string[] values = null;
        while ((zee1 = sr.ReadLine()) != null)
        {
            values = zee1.Split(',');
            points.Add(new Point(int.Parse(values[0]), int.Parse(values[2])));
        }
    }

    pictureBox1.Enabled = true;
    g = pictureBox1.CreateGraphics();
    for (int i = 0; i < points.Count - 1; i++)
        g.DrawLine(pen1, points[i], points[i+1]);
}