Gets or sets a value that indicates whether form is minimized, maximized, or normal.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The value specified is outside the range of valid values.
Before a form is displayed, the property is always set to FormWindowState.Normal, regardless of its initial setting. This is reflected in the Height, Left, Top, and Width property settings. If a form is hidden after it has been shown, these properties reflect the previous state until the form is shown again, regardless of any changes made to the property.