How to write Linq query for count salary

Question

Hello Friends,

 

In my database, I have a colum Salary with numeric(18,0)

I want to write code for getting total employee salary 

For example;  select couunt(*) from Employee

 

select Department,count(*) from Employee group by Department 

 

Here I wrote; 

var count = db.Employees.Count(x => Convert.ToBoolean(x.Salary));

But,Im getting error. please help me to solve