Null test vba

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Returns a Boolean value that indicates whether an expression contains no valid data Null. The required expression argument is a Variant containing a numeric expression or a string expression. If expression consists of more than one variable , Null in any constituent variable causes True to be returned for the entire expression. The Null value indicates that the Variant contains no valid data. Null is not the same as Empty , which indicates that a variable has not yet been initialized.

It is also not the same as a zero-length string "" , which is sometimes referred to as a null string. Use the IsNull function to determine whether an expression contains a Null value. 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?

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