Vbs check null value

You are free to use this image on your website, templates etc, Please provide us with an attribution link How to Provide Attribution? The below code is the demonstration code for you. Now check whether the empty value is NULL or not.

Below code is to test whether the empty string is NULL or not. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? An empty string is an instance of a System.

String object that contains zero characters. Empty strings are used quite commonly in various programming scenarios to represent a blank text field. Empty strings are initialized like this:. A null string does not refer to an instance of a System.

String object and any attempt to call a method on a null string results in a NullReferenceException. In the above code we created a string Object and assigned Nothing and next we check the string is null or not. IsNullOrEmpty is a convenience method that enables you to simultaneously test whether a String is Nothing or its value is Empty.

News items are sent to the receiver by the NewsBroadcaster. SendNews delegate. Before null conditional operators, code like the following ensured that the delegate invocation list was not Nothing :. The new way is thread-safe because the compiler generates code to evaluate SendNews one time only, keeping the result in a temporary variable.

You need to explicitly call the Invoke method because there is no null-conditional delegate invocation syntax SendNews? Skip to main content.