In an expression such as this: 

Protected Sub CreateUser_Click(ByVal sender As Object, ByVal e As System.EventArgs), what do these actually mean, or represent, please:

ByVal sender As Object, ByVal e As System.EventArgs

and that little 'e'?

Can (ByVal sender As Object, ByVal e As System.EventArgs), be broken up into:

1) ByVal sender As Object

2) ByVal e As System.EventArgs

I am trying to understand what these mean to a Windows computer in the .NET environment. In human-speak, what are they telling the computer to do?

Thanks!

Blueie

 

There's a pretty good explanation of the difference here: https://msdn.microsoft.com/en-us/library/ddck1z30.aspx. Basically, ByVal prevents those variables from being changed by the procedure you are calling. The structure of this procedure indicates that it is a Webforms project and that this automatically-generated sub is called on the click event of a button called "CreateUser". It contains two arguments.

 

Byval sender as Object is the first argument. "Sender" is the object (in this case, the button) that raised the click event.

 

ByVal e as System.EventArgs is the second argument, where "e" is the event data. This gives an overview of the structure of the EventArgs class: https://msdn.microsoft.com/en-us/library/system.eventargs(v=vs.110).aspx

 

I know this is an old thread, so you probably know this by now

 

 

Many thanks for your reply and explanation.

 

I will take a look at those links you have kindly provided.

 

No, I didn't know it. You are the first one to explain!

 

Thanks again.

 

Blueie