By default, the MultiLine property is False, which indicates that the control can display a single line only. Use the Text property to specify the control's text. The control's text is evaluated using arithmetic operators. Use the TextLine property to access the line based on its index.  Use the InsertText method inserts text/lines to control. Use the InsertLockedText method inserts locked text/lines to control. Use the Result property to get the result, if the expression is valid. Use the IsValid property to specify whether the Text property is syntactically correct, and may be evaluated. The result is displayed as the user types the expression. The control fires the Change event when the user alters the expression. The Count property gets the number of lines in the control.