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In ComboBox, Adding - Select Item on index -1

Posted on 2010-08-25
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Last Modified: 2013-11-27

VS 2005 / Vb.Net

 cmbState.DataSource = objDs.Tables(0)
        cmbState.Items.Insert(-1, "-- Select --")
        cmbState.DisplayMember = "StateShortName"
        cmbState.ValueMember = "StateID"
0
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Question by:chokka
  • 5
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  • +1
12 Comments
 
LVL 10

Expert Comment

by:Jini Jose
ID: 33523177
add the ListItem "select" in the html section in design time.
then set the property AppendDataItems = true
0
 
LVL 10

Expert Comment

by:Jini Jose
ID: 33523187
sorry it is for web
0
 

Author Comment

by:chokka
ID: 33523229
ComboBox .. Its windows App .. ( VB.Net / VS 2005 )
0
 
LVL 1

Expert Comment

by:narendragummadi
ID: 33523384
Do you want to insert "-- Select --" as frist entry in the combobox?
0
 

Author Comment

by:chokka
ID: 33523458
yes
0
 
LVL 17

Expert Comment

by:Zhaolai
ID: 33523479
-1 is not a valid index. Index is 0-based.
If you want to add "--Select--" as the first item in the combobox, you can do either of the following:

1. cmbState.Items.Insert(0, "-- Select --")
or
2. cmbState.Items.Add("-- Select --")
 before populating the records.

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Author Comment

by:chokka
ID: 33523545


1. cmbState.Items.Insert(0, "-- Select --")
or
2. cmbState.Items.Add("-- Select --")
 before populating the records.


I tried both the ways .. But value is not reflecting in ComboBox.
Do i need to change some property settings in the ComboBox
0
 

Author Comment

by:chokka
ID: 33523554


Thats the actual Code

Public Sub PopulateDState()
        Dim objBL As New BusinessLayer.BusinessLayer
        Dim objDs As New DataSet
        objDs = objBL.PopulateState()

        'cmbDState.Items.Insert(0, "-- Select --")
        cmbDState.Items.Add("-- Select --")
        cmbDState.DataSource = objDs.Tables(0)

        cmbDState.DisplayMember = "StateShortName"
        cmbDState.ValueMember = "StateID"
    End Sub
0
 
LVL 17

Expert Comment

by:Zhaolai
ID: 33523598
Add the following line after the combo box is populated:

cmbDState.SelectedIndex = 0
0
 

Author Comment

by:chokka
ID: 33523626

I have added ... But still its not working ..!

I have kept the ComboBox inside a Panel .. was it a reason ?


    Public Sub PopulateState()
        Dim objBL As New BusinessLayer.BusinessLayer
        Dim objDs As New DataSet
        objDs = objBL.PopulateState()
        'cmbState.Items.Insert(0, "-- Select --")
        cmbState.Items.Add("-- Select --")
        cmbState.DataSource = objDs.Tables(0)

        cmbState.DisplayMember = "StateShortName"
        cmbState.ValueMember = "StateID"
        cmbState.SelectedIndex = 0
    End Sub
0
 
LVL 1

Accepted Solution

by:
narendragummadi earned 500 total points
ID: 33523732
First add a new row to the dataset you are binding to the combobox and set values for the row and then insert that row at first postion.

Dim dr As DataRow = objDs.Tables(0).NewRow()
' create a new row into the dataset
dr(0) = "-- Select --"
dr(1) = 1102
.
.
.
objDs.Tables(0).Rows.InsertAt(dr, 0)

and now bind your dataset to the combo box
0
 
LVL 17

Expert Comment

by:Zhaolai
ID: 33524058
@narendragummadi's solution should work. You may want to check out this link:

http://www.codeproject.com/KB/combobox/addselecttoboundcombo.aspx

The code is in C#, but you can easily convert it to VB.NET here:
http://www.developerfusion.com/tools/convert/csharp-to-vb/

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