WebMonthCalendar1.HideOtherMonthDays = true
WebMonthCalendar™ allows you to hide other month days from displaying to the end-user. You can achieve this by simply setting the control’s HideOtherMonthDays property to True. By default, this property is set to False.
You can set the HideOtherMonthDays property either by using the Microsoft® Visual Studio® Property Window or by using the following code:
In Visual Basic:
WebMonthCalendar1.HideOtherMonthDays = true
In C#:
WebMonthCalendar1.HideOtherMonthDays = true;