Maximale waarde ophalen van sql-vb.net

Methode ExecuteScalar() retourneert System.Object dus verander je code.

 Dim value=cmd2.ExecuteScalar()
 IF Not IsNoThing(value) Then
    result=Decimal.Parse(value.ToString())
 End IF    

Of u kunt ExecuteReader gebruiken,

   Dim dr2 As OracleDataReader = cmd2.ExecuteReader()
    Dim value as Decimal
    If dr2.Read() Then
       IF Not dr2.IsDbNull(0)
           Value=dr2.GetDecimal(0)
       End IF
    End If

En altijd gebruik parameters in plaats van hardcoded sql string.

cmd2.CommandText = "SELECT MAX(LASTNO) FROM d001005 where [email protected] and CODE1='CASH' and [email protected]"
cmd2.Parameters.Add("@lbrcode",SqlDbType.VarChar,20).Value=lbr
.....