Combobox events in C#

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Consider there is a combobox with four items(All,Chemistry,Physics,Maths) in a windows form.I need to give item "All" when form loading.Then I can see the combobox with item "All" after loading the form.For this I can use form_load event.After loading the form I need to execute some code when I change items in combobox.For this I used SelectedIndexChange event in combobox.But when I load the form there is an error because when I load the form both events are executed.What should I do.

Posted 8-Jan-13 18:06pm

NISHAN SANDEEPA

Updated 23-Dec-17 9:30am

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Sandeep Mewara 9-Jan-13 0:10am

What error?

ridoy 9-Jan-13 0:35am

which error?

MT_ 9-Jan-13 1:32am

Did you tried what I have suggested below ?

NISHAN SANDEEPA 9-Jan-13 4:20am

Yes I tried that.That's why I accepted your solution.

3 solutions

Solution 1

Create the selected index changed event in your load event, instead of having it defined in the designer. Then it won't fire, because it won't be there when you're setting it in code.

Posted 8-Jan-13 18:07pm

Christian Graus

Comments

NISHAN SANDEEPA 9-Jan-13 0:20am

Will you please elaborate Christian.

Christian Graus 9-Jan-13 0:23am

I have no clue how to spell it out more clearly. You can hook up an event in code. Do so in your load event

NISHAN SANDEEPA 9-Jan-13 0:27am

Can I chat with you by gmail or face book.

Christian Graus 9-Jan-13 0:28am

Not a chance in hell. This is really trivial. Honestly, it is.

NISHAN SANDEEPA 9-Jan-13 0:31am

Ok doesn't matter. I am a beginner for programming.I'll try again.Thank you so much.

MT_ 9-Jan-13 0:41am

Nishan, I agree with Christian that you need to clear basics before jumping into coding. I have elaborated what Christian is trying to suggest in my solution.

Christian Graus 9-Jan-13 0:34am

Most people here, seem to be. That's why I don't want 1000 people who are beginners, hounding me for help on facebook. Really, all of you people will struggle to ever be programmers, because you never learn the basics. Buy a book and work through it, instead of jumping in and getting lost in a hurry.

NISHAN SANDEEPA 9-Jan-13 0:42am

Ya I got that that.I am searching some ebooks and trying to download them.Thanks Christian,don't get upset and sorry for the disturb.

Solution 3

http://msdn.microsoft.com/en-in/library/system.web.ui.webcontrols.dropdownlist_events.aspx[^]
http://stackoverflow.com/questions/4905406/dropdownlists-selectedindexchanged-event-not-firing[^]

Posted 8-Jan-13 18:25pm

puskar gupta

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lalithashree 15-Mar-16 2:49am

asd

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MT_ · Accepted Answer · 2013-01-08T18:22:00

Hi,

I was wondering, if you can use SelectionChangeCommitted event rather. This will fire only when item is really selected by the user. Just tested it and it doesn't fire on setting up default value in the form load.

If you "HAVE" to use selectedIndexChanged event, use what Christian Graus has suggested.
Remove event handler you might have added through your form designer, now in your form load do as shown below.

C#

private void Form1_Load(object sender, EventArgs e)
{
   comboBox1.SelectedIndex = 1;
    comboBox1.SelectedIndexChanged += new EventHandler(comboBox1_SelectedIndexChanged);
}

Do remember to remove the event handler binding from form1.designer.cs after you remove it from form designer

Hope that helps

Milind

Combobox events in C#

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Solution 2

Solution 1

Solution 3

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