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From: TakeoverAnu
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Message 8 in Discussion
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TakeoverAnu
Difference between Null and DBNull :
A null value is a value that doesn't refer to any object. It's the default
value of reference-type variables (e.g., class, interface, delegate).The null
keyword is a literal that represents a null reference with the C# .NET
environment. You may use the null keyword to check or assign the value of an
object.
The use of the DBNull class indicates the absence of a known value. While the
Microsoft documentation says it's typically in a database application, you may
also use it with any type of data. In database applications, a null object is a
valid value for a field. This class differentiates between a null value (a null
object) and an uninitialised value (the DBNull.Value instance). For example, a
table can have records with uninitialised fields. By default, these
uninitialised fields have the DBNull value. You can utilise the DBNull object
by way of its Value property. This represents a null value, which is never
equal to anything.
Substantial difference between them is that if you put a null value in
SqlParameter, though the parameter did not exist, but if you put in
DBNull.Value, the parameter is included with a null value. same like COM
interop thing with VT_NULL and VT_EMPTY
And have you noticed that contrary to the docs, and contrary to SQL as well,
DBNull.Value.Equals(DBNull.Value) is true?
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