The standard
MessageBox class of
.NET shows the MessageBox by the
Show static method. The Show static method
generates the MessageBox internally using the various arguments passed to it and returns
DialogResult enum member.
The actual instance of the
MessageBox is not available to the user to manipulate the content and features of MessageBox like disabling the close button.
Hence, the author of the Article referred in the question has created a custom
extended message box with several features. One of the feature is to disable the close button.
The
extended MessageBox created by the author is derived from the
Windows.Forms.Form as can be seen from the class declaration given in the source code downloaded from the above article show below
internal class MessageBoxExForm : System.Windows.Forms.Form
Since, the
extended MessageBox is derived from the
Form class it can be passed to the
private void DisableCloseButton(Form form) as an argument. This method is not meant to pass the standard
MessageBox to it.
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