the event of " Selected index change " in comboBox

Question

5.00/5 (1 vote)

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i have two combobox and a DB, I want that when i select an item from first comboBox, the second comboBox shows its subfields from DB. i write the code in the event of " Selected index change " from first comboBox ,but it doesnt work correctly.
how can i write its code?
please help me

Posted 8-Apr-11 22:03pm

setareh_sky

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Comments

[no name] 9-Apr-11 4:05am

Which combo box event you used??
can you provide code!!

Sandeep Mewara 9-Apr-11 6:49am

Elaborate: but it doesnt work correctly.

5 solutions

Solution 2

Have a look on this[^].

Check whether first dropdown property AutoPostBack="True" or not.

Posted 8-Apr-11 22:37pm

TweakBird

Comments

Shahin Khorshidnia 9-Apr-11 7:36am

vote 5:
but:
If she means asp.net your answer will help.

Solution 4

For first combobox...
---------------------

public void cbo_1_Selected_Index_Changed(object sender, ...)
{
    //make the connection to the database sql querry select + where condition...
    //then the load the data into the second combo box


}

Posted 10-Apr-11 21:00pm

Santoshshrest

Solution 5

Make AutoPostBack="True" .It will done the trick. Nothing else is needed.

Posted 12-Apr-11 20:38pm

Prasanta_Prince

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Wendelius · Accepted Answer · 2011-04-08T22:12:00

Solution 1

The first question is, have you wired the event. Something like:

C#

comboBox1.SelectedIndexChanged +=
            new System.EventHandler(comboBox1_SelectedIndexChanged);

If that's done, the problem most likely is in the code you execute in the event. Since you didn't post the code, the best advice is to use the debugger to see what's going wrong.

Posted 8-Apr-11 22:12pm

Wendelius

Comments

Sergey Alexandrovich Kryukov 9-Apr-11 22:42pm

Mika, yes, this is one possibility, my 5.
I know another one; please see my Answer.
--SA

Wendelius 10-Apr-11 1:14am

Thank you :)

Nish Nishant 10-Apr-11 0:28am

Voted 5, good response!

Wendelius 10-Apr-11 1:14am

Thanks :)

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-04-09T16:41:00

Solution 3

Please pat attention: this event is not fired when you simply change selection in the list part of the combo box. It is fired only when you confirm selection with Enter or Dbl-click, so the selection is shown in the edit box part of the combo. This is confusing, but this is how this event is fired.

—SA

Posted 9-Apr-11 16:41pm

Sergey Alexandrovich Kryukov

Comments

Nish Nishant 10-Apr-11 0:28am

Voted 5, good alternative to Mika's reply.

Sergey Alexandrovich Kryukov 10-Apr-11 0:59am

Thank you, Nishant.
--SA

Wendelius 10-Apr-11 1:13am

This could also be the reason. My 5

Sergey Alexandrovich Kryukov 10-Apr-11 1:14am

Thank you, Mika.
--SA

Espen Harlinn 10-Apr-11 6:37am

My 5 :)

Sergey Alexandrovich Kryukov 10-Apr-11 20:30pm

Thank you, Espen.
--SA