Checking if Null
5377
Is there a standard function to check for null, undefined, or blank variables in JavaScript?
104501
How do I enforce null checking?
86344
Compare nullable types in Linq to Sql
118788
Setting Zero values back to NULL
2146
object==null or null==object?
58054
When is it OK to catch NullPointerException?
94883
Why does comparing a SQL date variable to null behave in this way?
60338
Null vs. False vs. 0 in PHP
45869
Why null cast a parameter?
94839
Check whether a string is not null and not empty
114349
What is a null-terminated string?
124471
Comparing nullable column values using "IS NULL" versus "= NULL"
94938
.NET : How do you get the Type of a null object?
41898
Nullable integer in .NET
75153
How to check value is coming from json is null or not?
152780
what is the difference between null != object and object!=null
153624
What's the difference between is_null($var) and ($var === null)?