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Frustrated try to Loop through combobox VB.Net

Posted on 2009-04-01
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Last Modified: 2012-06-27
Hi EE,

Getting really frustrated.  I have search everywhere trying to find an example of how to loop through items in a combobox.  It was so EASY in VB 6.
1.  I have a table Company that has a StateID
2.  I fill the table and capture the StateID value
3.  I fill my State combobox using the code below.
Now I need to find which item in the list has the same stateid.
I tried all kinds of things, but nothing works.
Please help
Thank you


Public Sub FillComboBox(ByVal cnt As ComboBox)
        'example fill states
        Dim ds As New DataSet
 
        If DatabaseToUse() = BizObjs.DBType.Access Then
            'Access Database
            Dim cFields As New cFieldTableNames            
            cFields.ComboTable = msTblName
            SelectStr = cFields.ReturnComboString()   'Returns my select statement
            Dim dc As New OleDb.OleDbConnection(ConnectionString)
            Dim da As New OleDb.OleDbDataAdapter(mSelectStr, dc)
 
            Try
                da.Fill(ds)
                dc.Close()
 
                cnt.DataSource = ds.Tables(0)
                cnt.DisplayMember = cFields.SendToCorrectFieldProcedure(3)  'Gets the field name for the display member
                cnt.ValueMember = cFields.SendToCorrectFieldProcedure(1)  ' Get the field name (StateID) for the valuemember
 
 
            Catch ex As Exception
 
                MessageBox.Show(ex.Message)
                Throw ex
 
            Finally
                dc.Close()
                da.Dispose()
            End Try
        End If
 
    End Sub

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Question by:Sheritlw
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8 Comments
 
LVL 53

Expert Comment

by:Dhaest
ID: 24036600
why re-invent the wheel for finding a specific item in a combobox?  The control already has the functionality built in....

// This will find the first item with "TEST" as it's value.
Dim index As Integer = comboBox1.FindStringExact("TEST")
// this will select the first item that has "TEST" as it's value.
comboBox1.SelectedIndex = index
0
 

Author Comment

by:Sheritlw
ID: 24036642
I tried the solution provided again as follows
i = cbo.FindStringExact(iValue.ToString)
it returns -1
0
 
LVL 53

Expert Comment

by:Dhaest
ID: 24036749
Can you give some example of values you see in your combobox and what value you are searching for ?
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Author Comment

by:Sheritlw
ID: 24036767

Yes, I am search for
IDs are autonumber fields in Access

ID 1 goes with Alaska
ID 2 goes with Alabama
ID 3 goes with Arkansa
ID  4  goes with State Arizona
ID 5 goes with California
ID 6 goes with Colorado

etc.
thanks
0
 

Author Comment

by:Sheritlw
ID: 24036772
My company table holds value 4 in its StateID field.
I need the combo to select id 4 and show Arizona.
0
 
LVL 53

Accepted Solution

by:
Dhaest earned 500 total points
ID: 24036778
Perhaps this can help you
Dim dt As DataTable = DirectCast(comboBox1.DataSource, DataTable)
Dim yourState as string
For i As Integer = 0 To dt.Rows.Count - 1
    Dim displayText As String = dt.Rows(i)(comboBox1.DisplayMember).ToString()
    Dim valueItem As String = dt.Rows(i)(comboBox1.ValueMember).ToString()
    ' Process the object depending on the type
    if valueItem = "TheValueYouAreSearchingFor" then
       comboBox1.SelectedIndex = i
       yourState = displayText
   end if
Next
0
 

Author Comment

by:Sheritlw
ID: 24036821
Hi Dhaest,

It worked!!!!  Thank you, thank you, thank you.
I have another question open that asks the same thing.  It is titled ...
"Retrieve Index of Matching value in Combobox"
Put something in there and I will give you those points to.
Thanks again
0
 

Author Closing Comment

by:Sheritlw
ID: 31565203
Excellent.  Gave me the perfect example.
Thanks for your help!
0

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