What is callback function explain with an example.

simply a callback function means a function which refers to an another function

i.e
1) pointers : which refers to some other variables
2)Virtual functions which refers to other functions
3)delegates in C# which refers to another function

protected void Page_Load(object sender, EventArgs e)

{

    Page.LoadComplete += new EventHandler(Page_LoadComplete);

}





void Page_LoadComplete(object sender, EventArgs e)

{

    throw new NotImplementedException();

}

 

Thanks and Regards
V.SaratChand
Show difficulties that how difficult you are

Kumar_jay99, if this helps please login to Mark As Answer. | Alert Moderator

Delegate is used to refer to a function/method. When a function/method is passed to a delegate, more or less we can call the function/method as Call Back Function, because we can call the function/method by using that delegate. Delegate is most used in Events (we can see events everywhere), so why delegate is very important.

If we have this code:

protected void Page_Load(object sender, EventArgs e)

{

    Page.LoadComplete += new EventHandler(Page_LoadComplete);

}

void Page_LoadComplete(object sender, EventArgs e)

{

    throw new NotImplementedException();

}

We can say the method Page_LoadComplete() as Call Back Function. And inner the LoadComplete event, it uses delegate to achieve this feature.
Refer this url
http://msdn.microsoft.com/en-us/library/843s5s5x.aspx

Kumar_jay99, if this helps please login to Mark As Answer. | Alert Moderator

@Kumar_jay99
plz Mark as Answer if post helps you.

Kumar_jay99, if this helps please login to Mark As Answer. | Alert Moderator