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When you send an IP packet to an endpoint outside of your local subnet, it must pass a gateway (typically a router). You can set the gateway address explicitly as part of an EnableStaticIP call or let the DHCP (Dynamic Host Configuration Protocol) service automatically configure it, as described in the next section.

Public Function Add(ByVal value As TimeSpan) As Date If IsEmpty Then Return Me.Date Else Return Me.Date.Add(value) End If End Function Public Function Subtract(ByVal value As TimeSpan) As Date If IsEmpty Then Return Me.Date Else Return Me.Date.Subtract(value) End If End Function Public Function Subtract(ByVal value As Date) As TimeSpan If IsEmpty Then Return TimeSpan.Zero Else Return Me.Date.Subtract(value) End If End Function Notice the special handling of empty SmartDate values. Adding or subtracting any value to an empty value results in an empty or zero value as appropriate. In any other case, the addition or subtraction is delegated to the actual underlying DateTime value in mDate.

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If you have a black box and it does not work well, what are you going to do about it About the only thing you can do is look at it and wonder why it is not doing so well You cannot fix it; you cannot tune it You quite simply do not understand how it works and you made the decision to be in this position The alternative is the approach that I advocate: understand your database, know how it works, know what it can do for you, and use it to its fullest potential..

To make SmartDate as similar to DateTime as possible, it needs to overload the operators that are overloaded by DateTime, including equality, comparison, addition, and subtraction.

A common use of REPEATABLE READ in databases that employ the shared read locks could be for lost update prevention.

You need not set the IP address, gateway address, and subnet mask explicitly. If your local network provides a reachable DHCP service, you can let the DHCP service automatically configure these parameters. The EnableDhcp method enables the DHCP service, which is the default setting. Alternatively, calling EnableStaticIP will deactivate the usage of DHCP. Dynamic IP addresses are assigned temporarily. You can release a dynamic IP address with ReleaseDhcpLease or renew it with RenewDhcpLease. The IsDhcpEnabled property indicates if DHCP is currently enabled.

Equality and inequality operators delegate to the override of the Equals() method: Public Overloads Overrides Function Equals(ByVal obj As Object) As Boolean If TypeOf obj Is SmartDate Then Dim tmp As SmartDate = DirectCast(obj, SmartDate) If Me.IsEmpty AndAlso tmp.IsEmpty Then Return True Else Return Me.Date.Equals(tmp.Date) End If ElseIf TypeOf obj Is Date Then Return Me.Date.Equals(DirectCast(obj, Date)) ElseIf TypeOf obj Is String Then Return Me.CompareTo(CStr(obj)) = 0 Else Return False End If End Function

If we have REPEATABLE READ enabled in a database that employs shared read locks (and not multi-versioning), lost update errors cannot happen. The reason lost updates cannot happen in those databases is because the simple act of selecting the data left a lock on it, once read by our transaction, that data cannot be modified by any other transaction. Now, if your application assumes that REPEATABLE READ implies lost updates cannot happen, you are in for a painful surprise when you move your application to a database that does not use shared read locks as an underlying concurrency-control mechanism. While this sounds good, you must remember that leaving the shared read locks behind on all data as it is read will, of course, severely limit concurrent reads and modifications. So, while this isolation level in those databases provides for lost update prevention, it does so by removing the ability to perform concurrent operations! You cannot always have your cake and eat it too.

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