Primitives Activities in WF

.NET Framework 4.6.1 provides several system-provided activities that provide a convenient mechanism for performing common tasks.

Activity	Description
Assign	Assigns a value to a variable at the current scope.
Delay	Puts one path of execution into an idle state, possibly allowing the workflow to be unloaded.
InvokeDelegate	Executes a delegate that derives from ActivityDelegate and is exposed as a property.
InvokeMethod	Executes a public method of a CLR object.
WriteLine	Writes a specified string to the console or a specified TextWriter object.