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How to validate if a DateTime field is not null / empty?

Anonymous User170710-Feb-2015

I found something like:

if (!String.IsNullOrEmpty(u.nome))

This code simply check if the name 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?

Updated on 10-Feb-2015

I am a content writter !

Can you answer this question?

Answer

10-Feb-2015

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
 }