Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

OnClick Variables

Posted on 2011-03-08
4
Medium Priority
?
405 Views
Last Modified: 2012-05-11
Hello, I am using C# to create an ASP.NET website.  Here's my issue:

I have a standard button on one page.  This button has an onclick setup to fire a method.  I have a second button on this page.  When the user clicks on this button, its onclick setup fires another method which does some stuff, BUT at the end of this method, I would like it to fire the first button's onclick method.

Currently when I add the name of the first button's onclick method ( button1_Click() ) to the end of the second button's onclick method, this error is displayed: "No overload method for..takes 0 arguments".

I know what this error means: the system wants me to include two variables when calling button1_click, which are the default:  object sender, EventArgs e

What are object sender, EventArgs e and how do I include them in my call to button1_Click from the button2_click method?

Thank you in advance.
0
Comment
Question by:karlhsc
  • 2
4 Comments
 
LVL 52

Accepted Solution

by:
Carl Tawn earned 2000 total points
ID: 35073996
"Sender" refers to the control that raised the event. "EventArgs" will is an object that contains data about the event, in the case of a button click event eventargs doesn't tell you anything useful. If you want to manually call the method associated with the click event you can safely pass null for both arguments:
button1_Click(null, null);

Open in new window

0
 
LVL 33

Expert Comment

by:Todd Gerbert
ID: 35074096
carl_tawn is absolutely correct, I would only expand on his response slightly to say that it is usually safe to pass null for both arguments - it certainly seems to be the case you could safely do so given your current example, just wanted to point out it's not always safe (99% safe, 1% not safe).

Also, I would suggest moving the code that actually does "stuff" into it's own method(s), and then calling those methods from the button event handlers:
private void Button1_Click(object sender, EventArgs e)
{
  // Button 1 just does stuff.
  DoStuff();
}

private void Button2_Click(object sender, EventArgs e)
{
  // Button 2 does stuff, and also does other stuff
  DoStuff();
  DoOtherStuff();
}

private void DoStuff()
{
  // Do some stuff 
}

private void DoOtherStuff()
{
  // Do some other stuff
}

Open in new window

0
 
LVL 52

Expert Comment

by:Carl Tawn
ID: 35074147
@tgerbert - You are of course correct - just figured it wasn't likely to be an issue in this scenario so skimmed over it :)

Just to expand a little. It is possible to use a single event handler as the target for an event on multiple controls. In a scenario like that you may want to cast "sender" in order to find out which control raised the event and act accordingly.
0
 

Author Comment

by:karlhsc
ID: 35074186
tgerbert: thank you for the additional information.  I see the merit in the architecture you provided.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
In real business world data are crucial and sometimes data are shared among different information systems. Hence, an agreeable file transfer protocol need to be established.
As many of you are aware about Scanpst.exe utility which is owned by Microsoft itself to repair inaccessible or damaged PST files, but the question is do you really think Scanpst.exe is capable to repair all sorts of PST related corruption issues?
The Relationships Diagram is a good way to get an overall view of what a database is keeping track of. It is also where relationships are defined. A relationship specifies how two tables connect to each other. As you build tables in Microsoft Ac…

564 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question