What is event bubbling ? Dot Net Interview Questions

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Server controls like Datagrid , DataList , Repeater can have other child controls inside them.Example DataGrid can have combo box inside datagrid.These child control do not raise there events by themselves , rather they pass the event to the container parent (which can be a datagrid , datalist , repeater) , which passed to the page as “ItemCommand” event.As the child control send there events to parent this is termed as event bubbling.