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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ladarling is correct. You want to compare to DBNull, not null.
The syntax I would use is this, as you loop through the results of the SqlDataReader returned by a call to ExecuteReader():
if (!reader.IsDBNull(reader.G
{
}
Some of that is my personal preference, but DBNull is definitely what you are trying to compare to.
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by: ladarlingPosted on 2009-08-31 at 10:20:57ID: 25224548
dr[Sendate]!=DBnull.Value
From MSDN:
Do not confuse the notion of nullNothingnullptra null reference (Nothing in Visual Basic) in an object-oriented programming language with a DBNull object. In an object-oriented programming language, nullNothingnullptra null reference (Nothing in Visual Basic) means the absence of a reference to an object. DBNull represents an uninitialized variant or nonexistent database column.
http://msdn.microsoft.com/