compare the difference between passing a null reference vs. a reference to a zero length string
using System;
public class Class1 {
public static void Main(string[] strings) {
Example exampleObject = new Example();
Console.WriteLine("Pass a null object:");
string s = null;
exampleObject.TestString(s);
Console.WriteLine();
Console.WriteLine("Pass an empty string:");
exampleObject.TestString("");
Console.WriteLine();
Console.WriteLine("Pass a real string:");
exampleObject.TestString("test string");
Console.WriteLine();
}
}
class Example {
public void TestString(string sTest) {
if (sTest == null) {
Console.WriteLine("sTest is null");
return;
}
if (String.Compare(sTest, "") == 0) {
Console.WriteLine("sTest references an empty string");
return;
}
Console.WriteLine("sTest refers to: '" + sTest + "'");
}
}
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