How to select points on the image

If all you want to do is select a point you can use a nested for loop to go through the entire image and then use some sort of if() statement to see if the pixel you're looking at is the one you want. Once you find the one you want then you can store it really easily by using the Point data structure, like this:

Point p1 = new Point(); p1.X = x; p1.Y = y;

This is saying that x and y are the variables used in the for loops and therefore the coordinates of the pixel you want to store. Hope that helps.