expression.Limit
expression Required. An expression that returns one of the objects in the Applies To list.
Remarks
Text box limits can be any number from 1 to 255 characters. Numbers higher than 255 will generate an error.
Example
This example creates a new Web text box control in the active publication, sets the default text and the character limit for the text box, and specifies that it is a required control.
Sub AddWebTextBoxControl()
With ActiveDocument.Pages(1).Shapes.AddWebControl _
(Type:=pbWebControlMultiLineTextBox, Left:=72, _
Top:=72, Width:=300, Height:=100).WebTextBox
.DefaultText = "Please enter text here."
.Limit = 200
.RequiredControl = msoTrue
End With
End Sub