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Binding to ASP DataSource components

RadComboBox supports binding to all ASP.NET 2.0 DataSource components, including:

  • AccessDataSource

  • SqlDataSource

  • XmlDataSource

  • ObjectDataSource

  • SiteMapDataSource

  • LinqDataSource

To bind to a DataSource component, all you need to do is set the DataSourceID property of RadComboBox to the ID of the DataSource component. You should also set the DataTextField and DataValueField properties of RadComboBox to map the Text and Value properties of the items to the respective columns / fields from the data source.

If you need to map additional columns from the data source to properties of RadComboBox items, you can use the ItemDataBound event. The event arguments passed to the event, e.Item and e.Item.DataItem, hold the instance of RadComboBox item being bound and the DataItem to which it is bound. You can map a property from the DataItem to the corresponding property of RadComboBox item. Be sure to cast the DataItem object to the proper data type first.


protected void RadComboBox1_ItemDataBound(object o, RadComboBoxItemEventArgs e) 
{ 
    DataRowView dataSourceRow = (DataRowView)e.Item.DataItem; 
    e.Item.Enabled = (bool)dataSourceRow["Enabled"]; 
    e.Item.Attributes["customAttribute"] = dataSourceRow["CustomAttribute"].ToString(); 
}


Protected Sub RadComboBox1_ItemDataBound(ByVal o As Object, ByVal e As 
RadComboBoxItemEventArgs) Handles RadComboBox1.ItemDataBound 

    Dim dataSourceRow As DataRowView = DirectCast(e.Item.DataItem, DataRowView)
    e.Item.Enabled = DirectCast(dataSourceRow("Enabled"), Boolean)
    e.Item.Attributes("customAttribute") = dataSourceRow("CustomAttribute").ToString()
End Sub

AccessDataSource

<asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="~/Data/Combo.mdb"
    SelectCommand="SELECT * FROM [Links]">
</asp:AccessDataSource>
<telerik:radcombobox 
    id="RadComboBox2" 
    runat="server" 
    datatextfield="Text" 
    datavaluefield="Value"
    datasourceid="AccessDataSource1" 
    onitemdatabound="RadComboBox2_ItemDataBound" />

SqlDataSource

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ComboConnectionString %>"
    SelectCommand="SELECT * FROM [Links]"></asp:SqlDataSource>
<telerik:radcombobox 
    id="RadComboBox1" 
    runat="server" 
    datatextfield="Text" 
    datavaluefield="Value"
    datasourceid="SqlDataSource1" 
    onitemdatabound="RadComboBox1_ItemDataBound" />

XmlDataSource


<telerik:radcombobox 
        id="RadComboBox1" 
        runat="server" 
        datasourceid="XmlDataSource1" 
        datatextfield="Text"
        datavaluefield="Value">
</telerik:radcombobox>

<asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/ContentFile.xml"></asp:XmlDataSource>

When using an XmlDataSource, the XML file should have the format shown below:


<items>
 <Item Text="New York" Value="1" />
 <Item Text="Paris" Value="2" />
 <Item Text="London" Value="3" />
</items>

note

You can also load the XML file directly, rather than using a DataSource component as an intermediary.

ObjectDataSource

<telerik:radcombobox 
    id="RadComboBox1" 
    runat="server"
    datavaluefield="ID" 
    datatextfield="Text"
    datasourceid="ObjectDataSource1">    
</telerik:radcombobox>
<asp:ObjectDataSource ID="ObjectDataSource1" TypeName="ComboObjectData" SelectMethod="GetItems"
    runat="server"></asp:ObjectDataSource>


public class ComboObjectData
{
    public ComboObjectData() { }
    public static List<ComboDataItem> GetItems()
    {
        List<ComboDataItem> itemsList = new List<ComboDataItem>(); 
        itemsList.Add(new ComboDataItem(1, "item 1")); 
        itemsList.Add(new ComboDataItem(2, "item 2")); 
        itemsList.Add(new ComboDataItem(3, "item 3"));
        return itemsList;
    }
    public class ComboDataItem
    {
        private string _text; 
        private int _id;
        public string Text 
        { 
            get 
            { 
                return _text; 
            } 
            set 
            { 
                _text = value; 
            } 
        }
        public int ID 
        { 
            get 
            { 
                return _id; 
            } 
            set 
            { 
                _id = value; 
            } 
        }
        public ComboDataItem(int id, string text) 
        {
            _id = id; 
            _text = text; 
        }
    }
}



Public Class ComboObjectData
    Public Sub New()
    End Sub
    Public Shared Function GetItems() As List(Of ComboDataItem)
        Dim itemsList As New List(Of ComboDataItem)()
        itemsList.Add(New ComboDataItem(1, "item 1"))
        itemsList.Add(New ComboDataItem(2, "item 2"))
        itemsList.Add(New ComboDataItem(3, "item 3"))
        Return itemsList
    End Function
    Public Class ComboDataItem
        Private _text As String
        Private _id As Integer
        Public Property Text() As String
            Get
                Return _text
            End Get
            Set(ByVal value As String)
                _text = value
            End Set
        End Property
        Public Property ID() As Integer
            Get
                Return _id
            End Get
            Set(ByVal value As Integer)
                _id = value
            End Set
        End Property

        Public Sub New(ByVal id As Integer, ByVal text As String)
            _id = id
            _text = text
        End Sub
    End Class
End Class