How Set SelectedIndex for ComboBox

Question

1.00/5 (3 votes)

See more:

I have a table in sqlServer like this:

ID Title Description
-----------------------------------
1 Director
3 Actor
5 Producer

And in my project there is 2 Form:
1. Activity
2. ActivityDialog

When I Click on Edit_Click() the ActivityDialog will be shown.

There is a DataBound comboBox in ActivityDialog Form which its DisplayMember is "Title" and ValueMember is "ID".
At ActivityDialog_Load() I want to set selectedIndex for comboBox to show the current record's ActivityType.

I have tried these but both of them returns -1:

C#

comboBox.SelectedIndex = comboBox.Items.IndexOf(1);

And

C#

comboBox.SelectedIndex = comboBox.Items.IndexOf("Director");

Posted 16-Aug-12 11:45am

WebMaster

Updated 16-Aug-12 12:00pm

v2

Add a Solution

Comments

Sergey Alexandrovich Kryukov 16-Aug-12 19:39pm

To be clear, you need to show the code sample where you add elements to the control.
--SA

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Kenneth Haugland · Accepted Answer · 2012-08-16T11:49:00

Solution 1

Try this:
comboBox.SelectedIndex = 1;

and the combobox is usually boiunded to a collection, so get the index in the collection in code insted.

Posted 16-Aug-12 11:49am

Kenneth Haugland

Updated 16-Aug-12 11:50am

v2

Comments

[no name] 16-Aug-12 17:52pm

You didn't understand.
The form is an Edit Dialog so I should Set the comboBox value dynamically.

Kenneth Haugland 16-Aug-12 17:55pm

Now I really dont understand you rproblem. If you wan tto select a specific index you should get it by the datatable or list you are populationg the items from. If you have recently added the item and want the last you added, simply use comboBox.Items.Count-1.

[no name] 16-Aug-12 18:01pm

See new Version of question.

Kenneth Haugland 16-Aug-12 18:04pm

It was just more confusing, if you whish to get the element you simply call the selectedindex and do something like MyList(comboBox.SelectedIndex) to get the corresponding row...

[no name] 16-Aug-12 18:14pm

When comboBox is not DataBound IndexOf() work perfectly.
for example I'd tried this before:

int year = 2012;
for (int i = 0; i < 20; i++)
{
this.comboBox.Items.Add(year);
year--;
}
then somewhere else:
comboBox.SelectedIndex = comboBox.Items.IndexOf("2010");
And the SelectedIndex value got 2;

Kenneth Haugland 16-Aug-12 18:18pm

Have you put a debug mark in the solution to check that the item actually exists, no spelling mistakes or anythong like that?

[no name] 16-Aug-12 18:25pm

Yes, Many times.
And I figure it out finally.
Next time test the codes first then make any suggestion and if you miss sth then ask.
Thank you anyway for your time.

Sergey Alexandrovich Kryukov 16-Aug-12 19:40pm

Next time please think at your question to make sure you provide sufficient information.
--SA

Sergey Alexandrovich Kryukov 16-Aug-12 19:41pm

My 5. It's hard to keep patience...
--SA

Kenneth Haugland 16-Aug-12 20:11pm

Thank you, Sergey :)

ridoy 17-Aug-12 2:04am

comboBox.selectedIndex =1 is the right solution