Perhaps it is helpful if I describe generally what I try to do

Imagine you have a List<Car>

the class car is described like this

class car
{
String brand;
int year;
double price;
}

Now Imagine that I have 20 cars in my list. And now I want to create a lambda expression that set the price of all cars with brand=="Volvo" to 4000.

This is the same thing as I try to do above.

I tried btw to replace the m_ShowCleared with a string like "Foo" but I get the same error. I thhink the expression is written with some other error.