c# function return

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c# function return - 

// To create a function with a return value, note the variable
// type in front of the function name and add a return of the
// same type at the end.
static string lastFirst(string firstName, string lastName)
{
	string separator = ", ";
	string result = lastName + separator + firstName;
	return result;
}

c# how to return a function - 

public void DoSomething()                          // Action
public void DoSomething(int number)                // Action<int>
public void DoSomething(int number, string text)   // Action<int, string>

public int DoSomething()                           // Func<int>
public int DoSomething(float number)               // Func<float, int>
public int DoSomething(float number, string text)  // Func<float, string, int>

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