Probably a super easy question 
I am trying to auto assign the user and date/time stamp as Key 1 in a UD table. The issue I have is joining them together. It tells me Concatenate isn’t available and if I just put a + I get “Operator ‘+’ cannot be applied to operands of type ‘string’ and ‘method group’”. How do I join these 2 into one string?
callContextClient.CurrentUserId + BpmFunc.Now().ToString