What is the difference between null and System.DBNull.Value?

Question

Is there any difference between null and System.DBNull.Value? If yes, what is it?

I noticed this behavior now -

while (rdr.Read())
{
    if (rdr[\"I         


        

Answer 1

From the documentation of the DBNull class:

Do not confuse the notion of null in an object-oriented programming language with a DBNull object. In an object-oriented programming language, null means the absence of a reference to an object. DBNull represents an uninitialized variant or nonexistent database column.