How to check if a DateTime field is not null or empty

Question

I am very new in C  and I have a doubt   In an application on which I am working I found something like it in the code   if   String IsNullOrEmpty u nome     This code simply check if the nome field of the u object is not an empty null string   Ok this is very clear for me  but what can I do to check it if a field is not a string but is DateTime object

User · Answer

DateTime is not standard nullable type  If you want assign null to DateTime type of variable  you have to use DateTime  type which supports null value   If you only want test your variable to be set  e g  variable holds other than default value   you can use keyword  default  like in following code   if  dateTimeVariable    default DateTime           do work for dateTimeVariable    null situation

User · Answer

If you declare a DateTime  then the default value is DateTime MinValue  and hence you have to check it like this   DateTime dat   new DateTime      if  dat  DateTime MinValue            unassigned        If the DateTime is nullable  well that s a different story    DateTime  dat   null    if   dat HasValue            unassigned

[c#] How to check if a DateTime field is not null or empty?

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