retrieve index of the items of a combobox

Question

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i want to retrieve Index of the items contained in a combobox.

for eg

comboBox_dept is populated with items from database as "one","two","three"

i need to find their indexes pro-grammatically.

i tried this

MIDL

int  index = comboBox_dept.FindString(one);
       comboBox_dept.SelectedIndex = index;

it always return -1.

C#

foreach (Object item in comboBox_dept.Items)
               {
                  int index1 = comboBox_dept.Items.IndexOf(item);
               MessageBox.Show(index1.ToString() + item);
               }

it only return 1st item only

any help or hint would be appreciated.

Posted 4-Jul-11 11:02am

sanomama

Updated 10-Jun-21 22:21pm

Chris Maunder772.4K

v2

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Comments

Simon_Whale 4-Jul-11 17:45pm

how are you adding them to the combobox?

sanomama 4-Jul-11 17:50pm

using sqldatareader.

Christian Graus 4-Jul-11 21:19pm

A sqldatareader cannot add items to a combo box. You must have code that's reading the DB, if you're iterating over the items, then you know the index as you put them in, and until you put them in, they have no index, but you can tell what it will be, by counting the items in your data source, assuming it's sorted, or the combobox is not sorted.

sanomama 4-Jul-11 22:25pm

SqlConnection con1 = new SqlConnection(str);
SqlCommand cmd = new SqlCommand("SELECT * from department ", con1); SqlDataReader DR = cmd.ExecuteReader();
while (DR.Read() && DR.HasRows) { comboBox_dept.Items.Add(DR["name"].ToString()); //name is the table department column from database }
i have added i like this.

4 solutions

Solution 2

It is not clear how items are added to the combobox? Are you doing something like comboBox_dept.Items.Add(sqldatareader);?

Add will add a single object to the list of items whatever the type of the object. If you want to add a range, then uses AddRange.

Your last code snippet seems to indicate that your list contains only one item. Are you seeing multiple items in the combo at run time.

If you are using databinding, I guess that should get the index from the original source.

Posted 4-Jul-11 15:12pm

Philippe Mori

Comments

sanomama 4-Jul-11 22:16pm

SqlConnection con1 = new SqlConnection(str);
SqlCommand cmd = new SqlCommand("SELECT * from department ", con1);
SqlDataReader DR = cmd.ExecuteReader();
while (DR.Read() && DR.HasRows)
{ comboBox_dept.Items.Add(DR["name"].ToString()); //name is the table department column from database
}

sanomama 4-Jul-11 22:19pm

i had addded item in above way. my combo box contains multiple items now. i need the check the items whether it exist in combobox ur not n gets its index too . can you provide some hints?

Christian Graus 4-Jul-11 23:11pm

I don't see any way in which, having done this, looping in the ways we've said, could fail. It has to work, if your combo box contains items. It does not care where they came from.

Philippe Mori 5-Jul-11 7:41am

By the way, if your database column are fixed width text, they are filled with spaces. Thus "abc" might be stored as "abc ". Check that the strings that are added does not contains extra spaces or trim them.

sanomama 6-Jul-11 21:05pm

thanks all for the replies.

Solution 3

Try this code:

VB

 Public Function GetTextDataGridView(ByVal DataGR As DataGridView, ByVal Rowget As Integer) As String

    GetTextDataGridView = vbNullString
    Try
        Dim i As Integer
        i = DataGR.CurrentRow.Index
        GetTextDataGridView = DataGR.Item(Rowget, i).Value
    Catch ex As Exception

    End Try

End Function

in Form_Load()

VB

Dim item As Object = GetTextDataGridView(frmListMembers.dgvListMember, 3)
Dim Index1 As Integer = cboSex.Items.IndexOf(item)
cboSex.SelectedIndex = Index1

Posted 4-Jun-13 0:05am

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Solution 4

int  index = comboBox_dept.FindString(one);

This returns the index of the item but you have to look for the text (DisplayMember, not ValueMember).

If you want to look for the ValueMember you can use

comboBox_dept.SelectedValue = "two";

int position = comboBox_dept.SelectedIndex; // This will return the position you are looking for

Posted 10-Jun-21 22:21pm

Mimí_BD

Comments

Richard MacCutchan 11-Jun-21 4:33am

Given that this was answered 10 years ago, it is unlikely that the questioner is still waiting for any more replies.

Mimí_BD 17-Jun-21 6:29am

Surely he won't... but for example i found the page looking for the same so I think it could be useful for another.

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

Christian Graus · Accepted Answer · 2011-07-04T11:11:00

Solution 1

Why don't you do a loop:

for (int i = 0; i < comboBox_dept.Items.Count;++i)
{
string s = comboBox_dept.Items[i].ToString();
// Now s is the string and i is the index
}

Posted 4-Jul-11 11:11am

Christian Graus

Comments

sanomama 4-Jul-11 17:33pm

items in the combobox are from database. so while looping counts give result zero.

sanomama 4-Jul-11 17:39pm

the loops return indexes if we have hard coded the items in combobox. but i have added the items from database using datareader.

Christian Graus 4-Jul-11 21:18pm

If the items are in the combobox, then you can use a loop and it will work, how can it not ? If your items are not yet in a combo box, then they have no index.

sanomama 4-Jul-11 22:27pm

i hardcoded the items from windows form n used the loop. it works but when i populate the combobox from database n use the loop, counts say null. but the items are in combox box. can suggest what i might be doing wrong.

Christian Graus 4-Jul-11 23:11pm

You need to post your code. If the Item Count is 0, then there's no items in your combobox. You must be checking before the items are there, nothing else makes sense.

sanomama 5-Jul-11 2:51am

i solve it. thanks for the forloop code :)

retrieve index of the items of a combobox

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