Combobox valuemember - how to set?

[Mondeo]

Hi,

 

I have a combobox on a form, I noticed that unlike the dropdownlist in asp.net which has a collection of ListItems the combobox can hold any object. So I created a ListItem class to use.

Public Class ListItem
   Dim _text, _value As String

   Property Text() As String
       Get
           Text = _text
       End Get
       Set(ByVal val As String)
           _text = val
       End Set
   End Property

   Property Value() As String
       Get
           Value = _value
       End Get
       Set(ByVal val As String)
           _value = val
       End Set
   End Property

   Sub New(ByVal inText As String, ByVal inValue As String)
       Me.Text = inText
       Me.Value = inValue
   End Sub

   Public Overrides Function ToString() As String
       Return Me.Text
   End Function
End Class

 

Then I added items to the combobox like this

 

Dim li as new listitem("My Text","My Value")

cboDealers.Items.Add(li)

 

I want to bind the value of the combobox to a datasource using Databindings.Add, but which property contains the value, is it a property of the listitem class I need to use or the combobox itself?

 

Thanks

[alreadyused]

just a quick fyi, when you have a combobox that you have added objects to, you have two options for setting that combobox to the specific object you want.

1. use .SelectedItem = myobject, and myobject must be an object in the list of items you added to the combobox

2. use .Text = mytext, where that matches the ToString of one of your objects.

 

so likewise, when the user changes a combobox, you can get the object via .SelectedItem, or you can get the ToString property of it by saying cbo.Text.

 

 

now for the binding, since you're overriding ToString with Me.Text, and you're wanting the Value instead, you're going to need the cbo.SelectedItem.Value property.

 

Whether or not you're able to bind that, I'm not sure. I don't use binding b/c i received a few lectures that it was bulky and slows down large apps, so I never pursued it any further. (Instead, on the SelectedIndex_Chaned event for the combobox, i capture the .SelectedItem and then update my table. If your combobox name matches your column's name, you can do this with one handler)