Extension Methods from MasoudH
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        DateTimeCheckValvethis ExtensionMethod check if startdate is null reutrn the min value of datetime and if the end date is null return the max value 
ExtensionMethod.NET Home of 881 C#, Visual Basic, F# and Javascript extension methods
this ExtensionMethod check if startdate is null reutrn the min value of datetime and if the end date is null return the max value