onCommand vs onClick for Buttons

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

have you already read the explanation on msdn? I don't think so.
OnCommand
OnClick

the main difference is that

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

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

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

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

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additionally you can specify the CommandName and CommandArgument.

OnBubbleEvent

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.

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

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Originally Posted by msdn

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.

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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-

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Originally Posted by memeloo

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

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That is exactly the same thing I am thinking about right now.