The code below adds in the implementation of above Monitor:

Private Static Monitor _instance = Null;
Public Static
Monitor Current


{
Get


{
If (_instance==Null)

_instance = New Monitor();
Return _instance;

}
}

But this system is put in many clients end, create a problem to avoid multi-line Cheng so, still come Double Check, revise the code above to be as follows:

Public Static Monitor Current


{
Get


{
Object O = New Object();
If (_instance==Null)
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