SelectedValue is always empty

[jason]

I am simply trying to read the selected value of an item that is selected in RadComboBox but I am unable to do so.  The SelectedValue value is always empty.  This is a pretty simple usage case so I don't understand why this should be difficult.  Does anyone know what is going on?

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    Dim cmd As New SqlCommand

    Dim con As New SqlConnection

    Dim da As New SqlDataAdapter

    Dim ds As New DataSet

 

    cmd.Connection = con

    con.ConnectionString = ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString

 

    con.Open()

    cmd.CommandText = "select top 100 CustomerID, isnull(Title, '') as Title, FirstName, LastName, FirstName + LastName as FullName from saleslt.customer"

 

    da.SelectCommand = cmd

    da.Fill(ds)

 

    RadComboBox1.DataValueField = "CustomerID"

    RadComboBox1.DataTextField = "FullName"

 

    RadComboBox1.DataSource = ds

    RadComboBox1.DataBind()

End Sub

 

Protected Sub RadComboBox1_SelectedIndexChanged(ByVal o As Object, ByVal e As Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs) Handles RadComboBox1.SelectedIndexChanged

    Dim s As String

 

    s = e.Value

    s = RadComboBox1.SelectedValue

 

End Sub

<telerik:RadComboBox ID="RadComboBox1" runat="server" Width="420"

    AllowCustomText="True" MaxHeight="300px" Filter="Contains" AutoPostBack="True">

    <HeaderTemplate>

        <ul>

            <li class="col1">Title</li>

            <li class="col2">First Name</li>

            <li class="col3">Last Name</li>

        </ul>

    </HeaderTemplate>

    <ItemTemplate>

        <ul>

            <li class="col1"><%#DataBinder.Eval(Container.DataItem, "Title").ToString()%></li>

            <li class="col2"><%#DataBinder.Eval(Container.DataItem, "FirstName").ToString()%></li>

            <li class="col3"><%#DataBinder.Eval(Container.DataItem, "LastName").ToString()%></li>

        </ul>

    </ItemTemplate>

</telerik:RadComboBox>

[Helen]

Hi Jason,

Please bind the RadComboBox only on the first Page_Load() and not on every postback. Your code should look like the following:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If (Not Page.IsPostBack) Then
        ................
        RadComboBox1.DataValueField = "CustomerID"
        RadComboBox1.DataTextField = "FullName"

        RadComboBox1.DataSource = ds
        RadComboBox1.DataBind()

    End If
End Sub

Kind regards,
Helen
the Telerik team