How to make a method from a string(Text) WPF

Question

I'm new in programing in WPF and I'm working on an application that uses AvalonEdit to make a script and get a string like this:

  "Task1Init
       Do Function1 (Argument 1)
       Do Function2 (Argument 2)
       Do Function3 (Argument 3)
   End"

Then I modify the string and get a Method like this:

"public void Task1(){
     Function1(A1);
     Function2(A2);
     Function3(A3);
}"

In this case all the functions are defined in a file AviliableFunctions.cs.

If I want to Run the Task1(), What will be the best way to convert the String into C# Code?, I have been searching and found the tool roslyn, but I'm not sure if it can be used to do this.