Does not contain a definition for and no extension method accepting a first argument of type could be found

Question

I\'ve looked around at some of the solutions to this problem but they don\'t seem to be the same as what I\'m experiencing.

Method that I\'m trying to call:

Answer 1

There are two cases in which this error is raised.

1. You didn't declare the variable which is used
2. You didn't create the instances of the class