Assembly: System.Windows.Forms (in system.windows.forms.dll)
Property Valuetrue if MaskedTextBox will overwrite existing characters as the user enters new ones; false if MaskedTextBox will shift existing characters forward. The default is false.
IsOverwriteMode takes into account both the value of the InsertKeyMode property and the state of the user's keyboard. If InsertKeyMode is set to either Insert or Overwrite, IsOverwriteMode will return false or true, respectively. If InsertKeyMode is set to Default, it will return the state of the INSERT key.
When IsOverwriteMode is false, MaskedTextBox will reject as invalid any character entry that would result in a violation anywhere in the mask. In explanation, if inserting a character would cause a character to be shifted over into a mask position where it would not be valid, the character insertion will be rejected.
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.