ADO.NET :: Creating Linq Sentences From Evaluated Variables?

If I had the Linq sentence:

var MyDC = new MyModel.MyDataContext();
var MyValues = from p in MyDC.Patio
where p.LoginID == loginId
select p;

Let's say that I have a second variable: MyCurrentTable which could be equal to: Patio, Furniture, Warehouse, Company, etc. depending on the table being used at any given time

From there, how can I get to a kind more generic kind of construction, like this one (for sure I know that the syntax I am using is not ok

var MyValues = from p in ({0}.{1}, MyDC, MyCurrentTable)
where p.LoginID == loginId
select p;

Where MyCurrentTable could be: any table at any given time, having this piece of code to work in a recyclable way, valid for any table.