in change default value in web service

[harsh17]

<DataMember(isRequired:=True)>
    Public Property SDate As Date?
<DataMember(isRequired:=True)>
    Shared Property EDate As Date?

In wcf client they acquire the default values as Now. but I want SDate to have vale Now.Date and EDate as Now.Date.AddMon ths(1). How can it be possible. I tried Constructor and setting default values after and before removing '?'.
Please Help.

[Frinavale]

It would help if you posted the constructor code that you attempted.