I want to draw a rectangle on a form in C#. I read and found this article. Are there any samples or tutorials available ? The article was not very helpful.
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The article you linked appears to be C++, which may explain why it didn’t help you much.
If you create events for MouseDown and MouseUp, you should have the two corner points you need for a rectangle. From there, it’s a matter of drawing on the form. System.Drawing.* should probably be your first stop. There are a couple of tutorials linked below:
Drawing with Graphics in WinForms using C#
Draw a rectangle using Winforms (StackOverflow)
Graphics Programming using C#