null values from database

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hi all, i am getting data's from my local database, also i am getting date from my database, some time that date value will be null value, how to assign that null value to my date data type in vb.net.

Posted 18-Jun-12 21:40pm

sameertm

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-06-18T21:46:00

Solution 1

The question is not quite clear, but one apparent part of it is: .NET System.DateTime type is not nullable, because this is a structure, a value type. How to express the null time then?

The answer is: you can use nullable type you can produce out of the (non-nullable) value type System.DateTime:

C#

System.DateTime structureValue = //... cannot be made null
System.DateTime? nullableTime = null; //assignment to null value is allowed

Please see:
http://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx[^].

—SA

Posted 18-Jun-12 21:46pm

Sergey Alexandrovich Kryukov

Updated 18-Jun-12 21:47pm

v2

Comments

sameertm 19-Jun-12 3:48am

no i have null value in my db Coloumn, i want assign that null value to my date variable

Sergey Alexandrovich Kryukov 19-Jun-12 3:51am

OK, I just explained how to do it. Didn't you get it yet? You probably have DbNull (on certain condition), don't you? In this case, assign null value to your value of the type "System.DateTime?" (NOT "System.DateTime"). What your "no" is supposed to mean?
--SA

db7uk 19-Jun-12 4:22am

yes. Use "dim myDateTime as DateTime?" or "dim myDateTime as nullable(of DateTime)". Your null value in the database will be DbNull.value. You can check for this and if true set the "myDateTime" to nothing.

Sergey Alexandrovich Kryukov 29-Jun-12 22:28pm

Yes. Nothing in VB.NET, null in C#.
--SA