Specifies the maximum number of characters the user can enter into the edit control.
Use MaxLength to limit the number of characters that can be entered into the edit control. A value of -1 indicates that there is no application-defined limit on the length.
Use MaxLength to limit the length of the text in an edit control if that text will be copied into a fixed-length buffer.
Note: Setting MaxLength to a value less than the number of characters currently in the edit control causes the edit control to truncate its text to MaxLength characters.