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The Form.ShowIcon property contains a bool value that indicates whether the form's Form.Icon is displayed in the caption bar of the form. If the Form.ControlBox property is false, both the icon and control box will be suppressed.
If Form.ShowIcon is false when the primary form is shown, a generic icon will be displayed in the taskbar button for the application.
This property has no effect if Form.FormBorderStyle is set to FormBorderStyle.FixedDialog. In that case, the form does not display an icon.