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The ButtonDataBound event occurs for each new button that is added to the Items collection of the toolbar when it is bound. This event only occurs if the buttons are loaded from a data source (the DataSource or DataSourceID property is set).

For each button that is added from a data source, the following events occur:

  1. A new item is created and added to the Items collection.

  2. The ItemCreated event occurs.

  3. The Text and Value properties of the item are set, based on the data.

  4. The ButtonDataBound event occurs.

The ButtonDataBound event handler receives two arguments:

  1. The RadToolBar that is loading items. This argument is of type object, but can be cast to the RadToolBar type.

  2. An EventArgs object. This object has an Button property, which provides access to the item that was just bound. This item, in turn, has a DataItem property, which lets you access the item in the data source to which the RadToolBarButton is being bound.

Use the ButtonDataBound event handler to make changes to items as they are bound to the data. For example, you can set custom attributes based on other fields in the DataItem:

protected void RadToolBar1_ButtonDataBound(object sender, RadToolBarButtonEventArgs e)
    DataRowView dataSourceRow = (DataRowView) e.Item.DataItem;     
    //set custom attributes from the datasource:     
    e.Button.Attributes["customAttribute1"] = dataSourceRow["CustomAttribute1"].ToString();     
Protected Sub RadToolBar1_ButtonDataBound(ByVal sender As Object, ByVal e As RadToolBarButtonEventArgs)

    Dim dataSourceRow As DataRowView = DirectCast(e.Item.DataItem, DataRowView)
    'set custom attributes from the datasource: 
    e.Button.Attributes("customAttribute1") = dataSourceRow("CustomAttribute1").ToString()

End Sub 

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