CODEWITHSUNDEEP
asp.net
karthik
karthik

Reputation: 341

ASP.NET DATE type validaiton

How i do check whether DateTime data type variable is null/empty in asp.net ?

Upvotes: 1

Views: 507

Answers (5)

D'Arcy Rittich
D'Arcy Rittich

Reputation: 171579

For a nullable DateTime type, you can just compare against null like this:

DateTime? d = null;
if (d == null)
    //do something

For a non-nullable DateTime type you can compare against the default MinValue:

DateTime d2;
if (d2 == DateTime.MinValue)
    //do something else

Upvotes: 2

Gimly
Gimly

Reputation: 6175

DateTime is a value type, therefore it cannot be null/empty. (see this msdn entry for reference).

By default it will get the value of DateTime.MinValue, so you could check if it is equal to that, but it's not the best solution.

The best solution would be to create a Nullable variable of this type. The syntax is the following:

Nullable<DateTime> myNullableDate = ...
if(myNullableDate.HasValue) ...

You can also use the question mark, this way, which is a bit simpler to read:

DateTime? myNullableDate = ...
if(myNullableDate.HasValue) ...

Upvotes: 0

Joachim VR
Joachim VR

Reputation: 2340

if !d.HasValue

Hasvalue is a property present in all made-nullable types. (Basically a generic class Nullable)

Upvotes: 0

Oren A
Oren A

Reputation: 5900

It's defaultly initialized to DateTime.MinValue, so you should only check that (unless it's of type DateTime?): 

if (MyDateTime==DateTime.MinValue)
...

Upvotes: 0

LukeH
LukeH

Reputation: 269658

A DateTime is a value-type, so it can't be null. Is your variable actually typed as DateTime?

Upvotes: 1

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