Question

Using VB.Net

I want to check whether the table row is null or 0

Code

 sCmd = New SqlCommand("SELECT * from table1)", conObjects.myConnection)
        dReader = sCmd.ExecuteReader
        While dReader.Read()
 If dReader.Item(11) <> "0" And dReader.Item(11) IsNot Nothing Then
msgbox ("Not NUll or 0")
End if
End while

Showing Error as “Operator '<>' is not defined for type 'DBNull' and string "0"“

Why i am getting this error, How to solve this problem.

Need VB.Net Code Help

Answer 1

You should always use AndAlso and OrElse instead of And and Or.
With AndAlso the latter expression is only evaluted if the former returned true. On this way you can avoid exceptions and make your code more efficient.

But apart from that, you should use reader.IsDBNull(index):

If Not dReader.IsDBNull(11) AndAlso dReader.GetString(11) <> "0" Then

End If