July 2008
Intermediate to advanced
1026 pages
27h 59m
English
In a number of projects, an application is broken up into multiple tiers. Quite often it is not possible to pass around strongly typed DataSets, because they may be quite large, or perhaps the project requires custom business objects. In either case, it is possible to take the DataBinding techniques you just learned for DataSets and apply them to objects. For the purposes of this discussion, use the following Customer and SalesOrder classes:
Public Class Customer
Private m_Name As String
Public Property Name() As String
Get
Return m_Name
End Get
Set(ByVal value As String)
m_Name = value
End Set
End Property
Private m_Orders As New List(Of SalesOrder)
Public Property Orders() As List(Of SalesOrder)
Get
Return m_Orders
End Get
Set(ByVal value As List(Of SalesOrder))
m_Orders = value
End Set
End Property
End Class
Public Class SalesOrder Implements System.ComponentModel.IDataErrorInfo Private m_Description As String Public Property Description() As String Get Return m_Description End Get Set(ByVal value As String) m_Description = value End Set End Property Private m_Quantity As Integer Public Property Quantity() As Integer Get Return m_Quantity End Get Set(ByVal value As Integer) m_Quantity = value End Set End Property Private m_DateOrdered As Date Public Property DateOrdered() As Date Get Return m_DateOrdered End Get Set(ByVal value As Date) m_DateOrdered = value End Set End Property Public ReadOnly Property ErrorSummary() As String _ Implements System.ComponentModel.IDataErrorInfo.Error ...