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Which should be used when comparing an object with null- Null or DBNull.Values

Last Modified: 2013-12-17
I have stored procedure which returns a table - dt. one of the columns in the table is a date column.
I need to write a condition wherein I need to check if the value is not equal to null

foreach (DataRow dr in dt.Rows)
// should I use dr[SendDate]!=null or dr  [SendDate]!=DBnull.value. which is correct in this scenario? (senddate is a datetime type column)
if ((dr["SENDDATE"] != DBNull.Value)                    

Please let me know hich is correct to user dr[Sendate]!=null or dr[Sendate]!=DBnull.Value
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