Gets a value indicating whether this is a multiline text box control.
Returns
true if the control is a multiline text box control; otherwise, false. The default is false.
Remarks
A multiline text box allows you to display more than one line of text in the control. If the word_wrap property is set to true, text entered into the multiline text box is wrapped to the next line in the control. If the word_wrap property is set to false, text entered into the multiline text box control will be displayed on the same line until a newline character is entered.