Question

Basically, Im making a paint application very similar to MSPaint.
The idea is that, that the the user clicks anywhere on the form and should be able to write text in a control. And then following that, that text should be displayed in g.drawstring graphic method.

Answer 1

I don’t want to do the whole thing for you, but here is a basic outline of one way to accomplish the goals you outline. This is not necessarily the best way, but it should get you started and will introduce you to a number of WinForms concepts.

Writing the text
Create a Form and add a TextBox control to it. Make sure it is hidden by default. Override the OnMouseClick method of your Form and add code that checks if the TextBox is visible and if not, shows it and puts focus to it for the user to enter their text. If the TextBox is already visible, the code should hide it and create a new UserControl in its place that shows the text (see below for details of that UserControl).

Also add an event handler to the TextBox so that if the user hits Esc, it cancels the edit and if they hit Enter, the text is accepted and the UserControl is created.

Displaying the text
Create a UserControl and make sure that the UserPaint and Opaque styles are set in its construction (see SetStyle – you may also want to consider OptimizedDoubleBuffer and AllPaintingInWmPaint as this can reduce flickering though it does require extra paint code).

Override the OnPaint method in your UserControl and implement the code for drawing the string (remember, you’ll also need a way to set the text on the control).

Conclusion
If you hook all that up, you should have something that appears to meet your requirements. For further experimentation, consider how you could remove the need for the UserControl. Good luck and have fun!