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Let s look at the simple things first. The original collection, as an ICollection, has a set of properties, such as Count and SyncRoot, that are simply exposed by SortedBindingList. For instance, here s the Count property: Public ReadOnly Property Count() As Integer _ Implements System.Collections.ICollection.Count, _ System.Collections.Generic.ICollection(Of T).Count Get Return mList.Count End Get End Property This technique is repeated for all the ICollection, IList, and IEnumerable properties. The notable exception to this is the default property, which is quite a bit more complex and is discussed later. If the original collection implements IBindingList, it has a broader set of properties. It might be editable and it might not. It might allow adding of new items or not. All these capabilities are exposed through its IBindingList interface, and SortedBindingList merely assumes the same settings. For instance, here s the AllowEdit property: Public ReadOnly Property AllowEdit() As Boolean _ Implements System.ComponentModel.IBindingList.AllowEdit Get If mSupportsBinding Then Return mBindingList.AllowEdit Else Return False End If End Get End Property Recall from the constructor that if the original collection doesn t implement IBindingList, then mSupportsBinding will be False. In that case, AllowEdit returns False because in-place editing isn t valid unless the original collection implements IBindingList. This technique is repeated for all the IBindingList properties.

If I have three clients, and all of them attempt to run a 45-second process more or less at the same time, two of them will get their response in 45 seconds and the third will get its response in 90 seconds This is rule number one for shared server: make sure your transactions are short in duration They can be frequent, but they should be short (as characterized by OLTP systems) If they are not short, you will get what appears to be a total system slowdown due to shared resources being monopolized by a few processes In extreme cases, if all of the shared servers are busy, the system will appear to hang for all users except the lucky few who are monopolizing the shared servers Another interesting situation that you may observe when using shared server is that of an artificial deadlock.

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The hardware layer consists of the actual hardware platform. This is either the target device (microprocessor and peripheral) or the hardware emulator running on a windows PC.

The IBindingList interface allows a sort to be applied to a collection, either ascending or descending, based on a single property. This is done through the ApplySort() method.

With shared server, a number of server processes are being shared by a potentially large community of users Consider a situation where you have five shared servers and one hundred user sessions established Now, at most, five of those user sessions can be active at any point in time Suppose one of these user sessions updates a row and does not commit While that user sits there and ponders his or her modification, five other user sessions try to lock that same row They will, of course, become blocked and will patiently wait for that row to become available Now, the user session that holds the lock on this row attempts to commit its transaction (hence releasing the lock on the row) That user session will find that all of the shared servers are being monopolized by the five waiting sessions.

We have an artificial deadlock situation here: the holder of the lock will never get a shared server to permit the commit, unless one of the waiting sessions gives up its shared server But, unless the waiting sessions are waiting for the lock with a timeout, they will never give up their shared server (you could, of course, have an administrator kill their session via a dedicated server to release this logjam) So, for these reasons, shared server is only appropriate for an OLTP system characterized by short, frequent transactions In an OLTP system, transactions are executed in milliseconds nothing ever takes more than a fraction of a second Shared server is highly inappropriate for a data warehouse Here, you might execute a query that takes one, two, five, or more minutes Under shared server, this would be deadly.

SortedBindingList implements two overloads of ApplySort(), making it possible to apply a sort based on the string name of the property, as well as by a PropertyDescriptor as required by IBindingList: Public Sub ApplySort( _ ByVal propertyName As String, _ ByVal direction As System.ComponentModel.ListSortDirection)

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