how to make a transaction across two WCF methods

[Johndow]

I am new to WCF, so please point me to the right direction.

I created 2 WCF serivces, each one uses a difference database connection in
the back end.
Now from the client application, I need to keep two methods call to the
service in one transaction.


using (TransactionScope scope = new TransactionScope())
{
using (Proxy1 proxy = new Proxy1())
{
proxy.Method1();
}
using (Proxy2 proxy = new Proxy2())
{
proxy.Method2();
}
scope.Complete();
}

Above code does not work. If there is exception in Method2, Method1 still
commit.

What will be the right way to make transcation across multiple WCF services?
Thanks