Parameters and Arguments

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A method can declare any number of parameters (in this example, i, s and o are the parameters):

static void DoSomething(int i, string s, object o) {
    Console.WriteLine(String.Format("i={0}, s={1}, o={2}", i, s, o));

Parameters can be used to pass values into a method, so that the method can work with them. This can be every kind of work like printing the values, or making modifications to the object referenced by a parameter, or storing the values.

When you call the method, you need to pass an actual value for every parameter. At this point, the values that you actually pass to the method call are called Arguments:

DoSomething(x, "hello", new object());

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