pixel

I am making a game, And I want to be able to draw a level in photoshop. And the game to read it. For this, I need a way to determine what are rectangles in a picture. For example, I have this kind of picture: And I want the program to realize what is a rectangle, What it's size and position...

Firstly i want to say that i'm not english and completely new to visual basic, c#,windows forms .. So sorry for my english and questions that might be dumb for some of you! So i have a button(pixelSetColor) and what i want to do is when i click on it is that a message box appears and when i...