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// Reference parameters.

public static void SwapStrings(ref string s1, ref string s2)

{

string tempStr = s1;

s1 = s2;

s2 = tempStr;

}

This method can be called as follows:

static void Main(string[] args)

{

Console.WriteLine("***** Fun with Methods *****");

...

string s1 = "Flip";

string s2 = "Flop";

Console.WriteLine("Before: {0}, {1} ", s1, s2);

SwapStrings(ref s1, ref s2);

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Console.WriteLine("After: {0}, {1} ", s1, s2);

Console.ReadLine();

}

Here, the caller has assigned an initial value to local string data (s and s2). Once the call to

SwapStrings() returns, s1 now contains the value "Flop", while s2 reports the value "Flip" (see

Figure 4-2).

Figure 4-2.

Reference parameters can be changed by the called method.