Assembly: System.Windows.Forms (in system.windows.forms.dll)
The GetFirstCharIndexOfCurrentLine method is inherited from the base TextBoxBase class. However, because the MaskedTextBox control does not support multiline configuration, this method is not supported.
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.