Retrieves the index of the first character of the current line. This method is not supported by System.Windows.Forms.MaskedTextBox.
This method will always return 0.
The MaskedTextBox.GetFirstCharIndexOfCurrentLine method is inherited from the base System.Windows.Forms.TextBoxBase class. However, because the System.Windows.Forms.MaskedTextBox control does not support multiline configuration, this method is not supported.