Hi !!

I went through a dozens of articles to find usefull tips on sender object and eventargs object , their utility with some examples. I still can't figure out how do we use sender object to refer to a property of the control within its event procedure.

for example i want a reference to a button object to modify its enabled property from within its click event routine , without using the name of the control. i just want to perform the task using the sender object only. but dont know how .

please help. Thanks in advance.

dev(1);

__________________
dev(1);

The sender is the object which fired the event, so the following might work:

Button b = (Button)sender;
b.Enabled = false;



/- Sam Judson : Wrox Technical Editor -/

Consider:

private void ButtonClick(object sender, EventArgs e)
{
   Console.WriteLine("Button Click Event Fired");
}

Obviously, you could wire this up to a single button's click event without a problem. However, I think what you want to know is how can you use one method to handle the events from many buttons (or other controls). In that case you could do soemthing like this:

private void ButtonClick(object sender, EventArgs e)
{
   Button b = (Button)sender;
   switch(b.ID)
   {
     case "button1":
     b.Enabled = false;
     break;

     case "button2":
     b.Enabled = true;
     break;

     case "button3":
     b.Enabled = true;
     break;
   }
}

hth.

================================================== =========
Read this if you want to know how to get a correct reply for your question:
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Wrox Books 24 x 7
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Awww, Sam beat me by 6 seconds! ;]

================================================== =========
Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
================================================== =========
.: Wrox Technical Editor :.
Wrox Books 24 x 7
================================================== =========

MY GOD !!

Such a quick response (Within a minute) !!

thank you very very much. That's exactly what i needed. Can u give me some use full tips like this on EVENTARGs E too. How can i use it say for eample in a button click event ?

I am waiting !!






dev(1);

Thank you too Sam !! that was really helpfull . Can you provide some usefull tips on eventargs e. How do i use it & when ?

dev(1);

In a buton click event the EventArgs has no properties, so is completely useless, just a placeholder.

In other events you'll find that the second parameter is a sub class of EventArgs, such as MouseEventArgs which contains properties detailing where the mouse was and what buttons where held down (for example).

/- Sam Judson : Wrox Technical Editor -/

I try to do the same thing in C++ but that didn't work.

((PictureBox)sender)

When i try to cast sender, i have an error who says that i cannot convert from System::Object ^ to System::Windows::Forms::PictureBox.

I really don't know how that dosen't work.

I use .NET 2005 whit a Windows Form project if that might help.

It's ok, i find the solution.

It's juste because cause i forgot something, instead of :

((PictureBox)sender)

i have to do

((PictureBox ^)sender)

don't know why i have to write ^ but that's work now.

If stupidity is a disease, your case appears to be malignant.
But don't worry, i've heard that the cure is easily administered via a delicate process involving a baseball bat...

That's not valid C#. Are you using C++ or C#? If you're using C++ then this is the incorrect forum really...

/- Sam Judson : Wrox Technical Editor -/