Passing Variable Between Webforms

I'm a little new to this .NET jazz so my question may be a little trivial but how do you pass variables between webforms?If you are coming from an ASP background, it's pretty much the same.. you can pass variables with the querystring, Server.Transfer(), Session, or a datbase solution. In .NET you can also use the Cache object if the data is of Application scope (everyone is using the same value).