NET Events - What are object sender EventArgs e

Question

What do sender and eventArgs mean refer to  How can I make use of them  for the scenario below    Scenario   I m trying to build a custom control with a delete function  and I want to be able to delete the control that was clicked on a page that contains many of the same custom control

User · Answer

FYI  sender and e are not specific to ASP NET or to C   See Events  C  Programming Guide  and Events in Visual Basic

User · Answer

The sender is the control that the action is for  say OnClick  it s the button    The EventArgs are arguments that the implementor of this event may find useful  With OnClick it contains nothing good  but in some events  like say in a GridView  SelectedIndexChanged   it will contain the new index  or some other useful data   What Chris is saying is you can do this   protected void someButton Click  object sender  EventArgs ea        Button someButton   sender as Button      if someButton    null                someButton Text    I was clicked

User · Answer

sender refers to the object that invoked the event that fired the event handler  This is useful if you have many objects using the same event handler   EventArgs is something of a dummy base class  In and of itself it s more or less useless  but if you derive from it  you can add whatever data you need to pass to your event handlers   When you implement your own events  use an EventHandler or EventHandler lt T gt  as their type  This guarantees that you ll have exactly these two parameters for all your events  which is a good thing

User · Answer

sender  is called object which has some action  perform on some control  event  its having some information about control which has     some behavoiur and identity perform     by some user when action will     generate by occuring for event add     it keep within array is called event     agrs

User · Answer

Manually cast the sender to the type of your custom control  and then use it to delete or disable etc  Eg  something like this   private void myCustomControl Click object sender  EventArgs e        MyCustomControl sender  DoWhatever        The  sender  is just the object that was actioned  eg clicked    The event args is subclassed for more complex controls  eg a treeview  so that you can know more details about the event  eg exactly where they clicked

[.net] .NET Events - What are object sender & EventArgs e?

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