Assuming it compiles…
The first one invokes the WriteLine method of the System.Console class. This is the normal mechanism for writing text output to the console.
The second one is using a class called WriteLine and assigning a value to its Text property. The question is – what is this WriteLine class?
Assuming it’s not your own invention, or part of some library you are using, perhaps it is the System.Activities.Statements.WriteLine class. You can check if you have a using statement at the top of your file that imports the System.Activities.Statements namespace. (You would also have had to reference the System.Activities.dll assembly.)
By itself, this will not actually do anything. The resulting class would have to be used in some other way to have any effect.
The System.Activities.Statements.WriteLine class and the assembly it belongs to are part of Windows Workflow Foundation.
See also, the answer to this StackOverflow question, which shows an example usage of the WriteLine class.
solved What is the difference between console.writeline(“hello world”) and new WriteLine(){Text=”Hello World”} [closed]