This code contains a sequential workflow running in a console application. There is a sequence and inside the sequence a QueryActions and ForeachLoop. The QueryActions Activity is a custom activity that you can create through Visual Studio add >> new >> .... etc... it gives you a design surface where you can drop standard out of the box activities. In this case the QueryActions activity has inside of it a standard toolbox DBQuery activity which lets you point and click your way to a database...