OracleDataReader: Operation is not valid due to the current state of the object

Hi all

I am new to using libraries and oracle development tools. I have a project in vb 2010 began when I use the oracleDataReader to read data from my db (10g). by using the following code:

Oradb As String = "xxxxxxxxxxx".
Dim conn As New OracleConnection (oradb)
Conn. Open()

Dim test (1000) As String
Dim counter As Integer = 0
Dim cmd As New OracleCommand

Connection group conn cmd.
cmd.CommandText = "table FROM SELECT column where otherColumn > 21 June 11 '.
cmd.CommandType = CommandType.Text
Var as OracleDataReader dr = cmd. ExecuteReader()
Dr. Read()
test (Counter) = Dr. GetString (0)
While Dr. Read()
test (Counter) = Dr. GetString (0)
Counter = counter + 1
Loop

cmd ExecuteReader().
cmd.CommandText = "SELECT FROM table where otherColumn > 21 June NewColumn 11'"
Dr. Read()
test (Counter) = Dr. GetString (0)


How could change the cmd.CommandText to run new queries? As it is the second command dr.read throws the following error: "operation is not valid due to the current state of the object.

I found stating an another OracleDataReader object will allow me to run another query, I guess that there is a better way to "reset" State of the object first, as opposed to the creation of any new object each time I need to reset the command text.


Any ideas are greatly appreciated. Do not forget that I am new to coding, so I know the real C could be cleaned.

Thank you 
...
cmd.CommandText = ""
dr = cmd.ExecuteReader()
dr.Read()
... etc ...

It will be useful,
Greg

Tags: Database

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