Default Date to null in C#

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Hi All,

I tried the following to null the default date, but no result. What is wrong in it.

if (exg.CertficateDatetime == ("01/01/1753"))
{
(exg.CertficateDatetime) = null;
}

Thanks in advance.

Posted 3-Jul-14 18:51pm

Murugan.NM

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Prasad Avunoori 4-Jul-14 0:55am

What is the datatype of CertficateDatetime?

Murugan.NM 4-Jul-14 1:00am

Date

PrakashCs.net 4-Jul-14 1:06am

yes use DateTime? MyDate=null; correct answer Suvabrata Roy

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*Suvabrata Roy* · Answer 1 · 2014-07-03T18:55:00

Solution 1

Hi,

DateTime is a value type so if you want to set null value in datetime filed it throw error.

there are some work around that's is :

C#

DateTime? MyDate=null;

Or

C#

Nullable<datetime> MyDate=null;</datetime>

They are same as per CLR.

Posted 3-Jul-14 18:55pm

Suvabrata Roy

Sergey Alexandrovich Kryukov · Answer 2 · 2014-07-03T18:56:00

The type System.DateTime is not a reference type but is a value type:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^].

To have a nullable type, use the type System.DateTime?:

C#

System.DateTime? referenceTime = null;

//...

referenceTime = System.DateTime.Now; // not null

SystemDateTime valueTime = time.Value; // assignment between objects of value and reference types

Please see:
http://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx[^],
http://msdn.microsoft.com/en-us/library/vstudio/2cf62fcy%28v=vs.120%29.aspx[^].

—SA