onCommand vs onClick for Buttons

[nabeelisnabeel]

I am wondering why there is onCommand and onClick both events for ASP:Button controls. What special purpose do they serve.

[memeloo]

have you already read the explanation on msdn? I don't think so.
OnCommand (http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.oncommand.aspx)
OnClick (http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.onclick.aspx)

the main difference is that
The Command event is raised through the control hierarchy in the form of the BubbleEvent.

[nabeelisnabeel]

Actually I read it earlier but could not get the concept of 'BubbleEvent' clearly. Can you explain it.

[memeloo]

this means that when a Button is nested for example in a DataGrid, then the DataGrid's OnBubbleEvent method is automaticaly called... and so forth

Use the OnBubbleEvent method to pass an event raised by a control within the container up the page's UI server control hierarchy.

additionally you can specify the CommandName and CommandArgument.

OnBubbleEvent (http://msdn.microsoft.com/en-us/library/system.web.ui.control.onbubbleevent.aspx)

[nabeelisnabeel]

does it have any practical significance.

if we have some buttons inside a GridView and every button has some CommandArguement. how can we use them. should we implement a Command event for every button of a Command Event for GridView.

[memeloo]

here's a nice explanation of event bubbling: http://www.4guysfromrolla.com/articles/051105-1.aspx

The Command event is raised when the Button control is clicked. This event is commonly used when a command name, such as Sort, is associated with the Button control. This allows you to create multiple Button controls on a Web page and programmatically determine which Button control is clicked.

it looks like the Command event is a general click-event handler for a group of buttons and the CommandName property helps to distinguish which button was cliked.

but although I understand the whole concept I don't know why would I want to bubble the command event-

[nabeelisnabeel]

but although I understand the whole concept I don't know why would I want to bubble the command event-
That is exactly the same thing I am thinking about right now.