Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.
Course Of The Month
8 days, 6 hours left to enrollBecome a Premium Member and unlock a new, free course in leading technologies each month.
Solved
OnClick Variables
Posted on 2011-03-08
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.
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.
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
2
4 Comments
"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);
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:
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
}
@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.
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.
Featured Post
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
Introduction
This article shows how to use the open source plupload control to upload multiple images. The images are resized on the client side before uploading and the upload is done in chunks.
Background
I had to provide a way for user…
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 this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar.
Int…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Suggested Courses
Course of the Month8 days, 6 hours left to enroll
729 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.