Visual basic what is the difference between sub and function

Then, you can use the following syntax to call the Sub method on the instance object:. The following Sub procedure tells the computer operator which task the application is about to perform, and also displays a time stamp. Instead of duplicating this code at the start of every task, the application just calls tellOperator from various locations. Each call passes a string in the task argument that identifies the task being started.

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Privacy policy. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. You can use the Call keyword when you call a Sub procedure, but that keyword isn't recommended for most uses.

For more information, see Call Statement. Visual Basic sometimes rearranges arithmetic expressions to increase internal efficiency. For that reason, if your argument list includes expressions that call other procedures, you shouldn't assume that those expressions will be called in a particular order. By using the Async feature, you can invoke asynchronous functions without using explicit callbacks or manually splitting your code across multiple functions or lambda expressions.

If you mark a procedure with the Async modifier, you can use the Await operator in the procedure. When control reaches an Await expression in the Async procedure, control returns to the caller, and progress in the procedure is suspended until the awaited task completes. When the task is complete, execution can resume in the procedure. You can also mark a Function Statement with the Async modifier.

Async Sub procedures are primarily used for event handlers, where a value can't be returned. An Async Sub procedure can't be awaited, and the caller of an Async Sub procedure can't catch exceptions that the Sub procedure throws. An Async procedure can't declare any ByRef parameters. The following example uses the Sub statement to define the name, parameters, and code that form the body of a Sub procedure.

DelayAsync has a Return statement that returns an integer. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Source code. You can perform it several times after running the code.

Save Saved Removed 0. Related Articles. Added to wishlist Removed from wishlist 0. Leave a reply Cancel reply. About ExcelDemy. Search in ExcelDemy. Instead of doing that, you can write your own Function or Sub. You only have to write it once. Then when you want to use it, you just refer to it by name, and the code will get executed. We'll soon write a Sub that we can use over and over again.

First, though, in case you are wondering what the difference is between a Function and a Sub, it's this: Functions return a value, and Subs don't.

Substring is a Function, because you want some sort of answer back, and an answer that you can then use elsewhere. You assign the answer to the Substring function to a variable.