Remove the ability to resize

Goal: Don't want the user to make changes in the program's size.

Problem: Don't know how to remove that icone thing that allows user to resiz开发者_StackOverflow中文版e the screen.

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You should set the FormBorderStyle property of your form to a style that forbids resizing (any of the Fixedxxx styles will do).

Still, remember that, especially for main windows, often locking the size of the window is not a good choice in terms of program usability; resize logic is often boring and not easy to get right, but in general it's worth the effort (and the various Dock and Fill properties of the controls are there to help).

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Set the FormBorderStyle to Fixed Single:

http://msdn.microsoft.com/en-us/library/hw8kes41%28v=vs.71%29.aspx

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And don't forget to set ShowMinimize & Maximize to false as well (in addition to the form border style)