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The RadSlider control raises a server-side event, ValueChanged that fires when the user changes the Value with the mouse or mouse wheel. Set the AutoPostBack property True to raise the event right after the value is changed on the client. Retrieve the Value property within the ValueChanged event handler:

protected void RadSlider1_ValueChanged(object sender, EventArgs e)
    Label1.Text = (sender as Telerik.Web.UI.RadSlider).Value.ToString();
Protected Sub RadSlider1_ValueChanged(ByVal sender As Object, ByVal e As EventArgs)
    Label1.Text = (TryCast(sender, Telerik.Web.UI.RadSlider)).Value.ToString()
End Sub 


The OnDataBound sever-side event of the RadSlider fires when all its items are loaded from a specified data source. You can use this event when you are data binding the RadSlider and you want to execute logic that relies on already loaded items. The example below demonstrates setting the fourth item of a data-bound RadSlider as a selected item:

protected void OnDataBound(object sender, EventArgs e)
    if (!IsPostBack)
        slider.SelectedValue = slider.Items[3].Value;
Protected Sub OnDataBound(sender As Object, e As System.EventArgs) Handles slider.DataBound
    If Not IsPostBack Then
        slider.SelectedValue = slider.Items(3).Value
    End If
End Sub

See Also

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