Vb net if is null

So an Integer assigned to Nothing is zero. Tip Structures are too a value type. When we assign them to Nothing, we get an empty Structure with no bits set to 1. A string in VB. NET can be assigned to Nothing, which is the same concept as Null. We can test a Nothing String with the String. IsNullOrEmpty method. Tip The term "null" is simply a different name for "Nothing. NET program that uses String. Null versus nothing.

Nothing is not just like null in C. Instead, it has a special behavior when used with value types—it acts like the default. Note Thanks to Matthieu Penant for pointing out that Nothing has a separate meaning on value types. IsNullOrEmpty is a convenience method that enables you to simultaneously test whether a String is Nothing or its value is Empty. It is equivalent to the following code:.

NullReferenceException indicates that you are trying to access member fields, or function types, on an object reference that points to null.

That means the reference to an Object which is not initialized. More about Home C VB. How to VB. What is VB.

It is equivalent to the following code:. Empty , or it consists only of white-space characters. Although the composite formatting feature can gracefully handle a null string, as the following example shows, attempting to call one if its members throws a NullReferenceException.

A string is empty if it is explicitly assigned an empty string "" or String. An empty string has a Length of 0. If you use StringSplitOptions. RemoveEmptyEntries you can get an empty array back.

John Saunders k 25 25 gold badges silver badges bronze badges. Jim H. The keyword for null in VB is Nothing. Split " " If items. It's of course easier to check the input first: If str. Guffa Guffa k gold badges silver badges bronze badges. Kermott D. Kermott 1, 14 14 silver badges 21 21 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.

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