how to add value to combobox item

Question

How can I add data value of each item to combobox in Visual Basic 2010   Like html drop-down box   Or is there anyway to add values to each item    I am adding item from MySQL database like this   Command   New MySqlCommand  SELECT   FROM  maillist  WHERE l id       amp  id  amp       connection   Command CommandTimeout   30 Reader   Command ExecuteReader   If Reader HasRows   True Then     While Reader Read           ComboBox1 Items Add Reader  name        End While End If   I need to add Reader  ID   as value of each item

User · Answer

Instead of adding Reader  Name   you add a new ListItem  ListItem has a Text and a Value property that you can set

User · Answer

If you want to use SelectedValue then your combobox must be databound   To set up the combobox   ComboBox1 DataSource   GetMailItems   ComboBox1 DisplayMember    Name  ComboBox1 ValueMember    ID    To get the data   Function GetMailItems   As List Of MailItem       Dim mailItems   New List Of MailItem       Command   New MySqlCommand  SELECT   FROM  maillist  WHERE l id       amp  id  amp       connection      Command CommandTimeout   30     Reader   Command ExecuteReader        If Reader HasRows   True Then         While Reader Read               mailItems Add New MailItem Reader  ID    Reader  name             End While     End If      Return mailItems  End Function  Public Class MailItem      Public Sub New ByVal id As Integer  ByVal name As String          mID   id         mName   name     End Sub      Private mID As Integer     Public Property ID   As Integer         Get             Return mID         End Get         Set ByVal value As Integer              mID   value         End Set     End Property      Private mName As String     Public Property Name   As String         Get             Return mName         End Get         Set ByVal value As String              mName   value         End Set     End Property  End Class

User · Answer

I am assuming that you are wanting to add items to a ComboBox on an Windows form  Although Klaus is on the right track I believe that the ListItem class is a member of the System Web UI WebControls namespace  So you shouldn t be using it in a Windows forms solution  You can  however  create your own class that you can use in its place  Create a simple class called MyListItem  or whatever name you choose  like this   Public Class MyListItem     Private mText As String     Private mValue As String      Public Sub New ByVal pText As String  ByVal pValue As String          mText   pText         mValue   pValue     End Sub      Public ReadOnly Property Text   As String         Get             Return mText         End Get     End Property      Public ReadOnly Property Value   As String         Get             Return mValue         End Get     End Property      Public Overrides Function ToString   As String         Return mText     End Function End Class   Now when you want to add the items to your ComboBox you can do it like this   myComboBox Items Add New MyListItem  Text to be displayed    value of the item      Now when you want to retrieve the value of the selected item from your ComboBox you can do it like this   Dim oItem As MyListItem   CType myComboBox SelectedItem  MyListItem  MessageBox Show  The Value of the Item selected is     amp  oItem Value    One of the keys here is overriding the ToString method in the class  This is where the ComboBox gets the text that is displayed     Matt made an excellent point  in his comment below  about using Generics to make this even more flexible  So I wondered what that would look like   Here s the new and improved GenericListItem class   Public Class GenericListItem Of T      Private mText As String     Private mValue As T      Public Sub New ByVal pText As String  ByVal pValue As T          mText   pText         mValue   pValue     End Sub      Public ReadOnly Property Text   As String         Get             Return mText         End Get     End Property      Public ReadOnly Property Value   As T         Get             Return mValue         End Get     End Property      Public Overrides Function ToString   As String         Return mText     End Function End Class   And here is how you would now add Generic items to your ComboBox  In this case an Integer   Me myComboBox Items Add New GenericListItem Of Integer   Text to be displayed   1     And now the retrieval of the item   Dim oItem As GenericListItem Of Integer    CType Me myComboBox SelectedItem  GenericListItem Of Integer   MessageBox Show  The value of the Item selected is     amp  oItem Value ToString      Keep in mind that the type Integer can be any type of object or value type  If you want it to be an object from one of your own custom classes that s fine  Basically anything goes with this approach

User · Answer

Although this question is 5 years old I have come across a nice solution   Use the  DictionaryEntry  object to pair keys and values   Set the  DisplayMember  and  ValueMember  properties to      Me myComboBox DisplayMember    Key     Me myComboBox ValueMember    Value    To add items to the ComboBox      Me myComboBox Items Add New DictionaryEntry  Text to be displayed   1     To retreive items like this   MsgBox Me myComboBox SelectedItem Key  amp       amp  Me myComboBox SelectedItem Value

User · Answer

Yeah  for most cases  you don t need to create a class with getters and setters  Just create a new Dictionary and bind it to the data source   Here s an example in VB using a for loop to set the DisplayMember and ValueMember of a combo box from a list            Dim comboSource As New Dictionary Of String  String            cboMenu Items Clear           For I   0 To SomeList GetUpperBound 0              comboSource Add SomeList I  Prop1  SomeList I  Prop2          Next I         cboMenu DataSource   New BindingSource comboSource  Nothing          cboMenu DisplayMember    Value          cboMenu ValueMember    Key    Then you can set up a data grid view s rows according to the value or whatever you need by calling a method on click   Private Sub cboMenu SelectedIndexChanged sender As Object  e As EventArgs  Handles cboMenu SelectionChangeCommitted     SetListGrid cboManufMenu SelectedValue  End Sub

User · Answer

Now you can use insert method instead add    Visual Basic CheckedListBox1 Items Insert 0   Copenhagen

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