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#26 – Null Literal
The keyword null represents a null literal. A null value indicates that a reference points to no object. Examples: object o1 = null; if (o1 == null) Console.WriteLine("Yup, it's null"); string s1 =...
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#206 – Value Types Can’t Represent Null Values
A reference type variable can be set to point to an instance of the type that it represents, or it can be set to the null value. The null value indicates that the object doesn’t point to anything....
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#207 – Nullable Types
Because value types can’t normally represent null values, C# includes nullable types–types that can represent their normal range of values or represent a null value. Any value type can be used as a...
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#477 – Full List of Escape Sequences for Character Literals
You can use one of several escape sequences within a character literal to represent a character that you can’t include directly in the literal. The full list of character literals includes: \’ – Single...
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#588 – A Default Parameter Value Can Be Null
When defining optional parameters and providing a default value for the parameter, you can use a value of null for a reference-typed parameter. null is actually the only valid default value that you...
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#730 – Check for null Before Iterating Using foreach Statement
The foreach statement allows iterating through all items in a collection. List<string> dogs = new List<string>(); dogs.Add("Kirby"); dogs.Add("Jack"); foreach (string s in dogs)...
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#1,009 – A String Can Be Null or Empty
A string variable can refer to a string that either contains characters, or an empty string. Because string is a reference type, a variable of type string can also be assigned a value of null,...
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#1,010 – Checking to See Whether a String is Null or Empty
An empty string and a null string are two different things. In some cases, you’ll want to check to see whether a string is null or to see whether it is non-null yet empty. string bobsNickname =...
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