[C#] Custom Dialog Form and Control the DialogResult's value

You can customize any windows form to be a dialog form, with setting the below properties:

Property Name	Value	Note
FormBorderStyle	Fixed Dialog
MinimizeBox	False
MaximizeBox	False
ControlBox	False
Topmost	True	Option. To set it if you want the dialog be the most top one even there is other windows programs. Maybe you will like to return it off in most time.
ShowIcon	False	When use this option, remember to sets ShowInTaskbar to false,too. As Tod's advice, he leave this true and topmost to false, so the user can switches to another program and get back to this from taskbar.
ShowInTaskbar	False	To 'hidden' the program from Taskbar.
CancelButton	The Button object's name	And the Button object's property DialogResult will be set to Cancel, too.
StartPosition	CenterParent

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For set the dialog's DialogResult, you can set it into a button's action or a custom method with

this.DialogResult = System.Windows.Forms.DialogResult.Cancel;

or just set the button's DialogResult property to the value you want to return.

REMEMBER to call the form with ShowDialog() not Show().