Storing a Data into WCF Service

Question

Hello,

I am trying to store a data into WCF service. 
I have an idea about InstanceContext Method to store Variabes data into WCF service.
My requirement is something like this,

1> I have one web page that displays a data from WCF service.
2> I have another C# application that will update a service  which is going to display on Web Page.

so i want to store the data between these applications.

So plz help me..