OracleCommand Update does not commit changes

Question

I am using the following code to update a table in oracle. It executes but the update does not commit. If I run the query with Oracle SQL Developer it works fine. What am I missing? SELECT statements work as expected.

`Dim BillOfLadingNumber As String = txtBillOfLadingNumber.Text.Trim

    Dim TrailerNumber As String = txtTrailerNumber.Text.Trim
    Dim CarrierCode As String = txtCarrierCode.Text.Trim
   Dim TransportationMethod As String = txtTransportationMethod.Text.Trim 
   Dim OracleCommand As New OracleCommand()
    With OracleCommand
        .Connection = OracleConnection
        .CommandType = CommandType.Text
        .CommandText = "UPDATE XXF_ASN_HEADERS SET BILL_OF_LADING_NUMBER ='" + BillOfLadingNumber + "',TRAILER_NUMBER ='" + TrailerNumber + "',CARRIER_CODE ='" + CarrierCode + "',TRANSPORTATION_METHOD ='" + TransportationMethod + "' WHERE HEADERID ='" + Request.QueryString("HeaderId") + "'"
    End With

    OracleConnection.Open()
    Dim result As Integer = OracleCommand.ExecuteNonQuery()
    OracleConnection.Close()

    If result = 1 Then Response.Redirect("default.aspx")`

Answer 1

Thank you all for pointing me out in the right direction. This is the final working code. The trick was using the OracleTransaction, the code below works like a charm. Parameter use are next. More information can be found here

            Using dbConnection As New OracleConnection(OracleConnectionString)

                'Open the connection
                dbConnection.Open()

                Dim dbCommand As OracleCommand = dbConnection.CreateCommand()
                Dim dbTransaction As OracleTransaction

                'Start a local transaction 
                dbTransaction = dbConnection.BeginTransaction(IsolationLevel.ReadCommitted)
                'Assign transaction object for a pending local transaction
                dbCommand.Transaction = dbTransaction

                Try
                    dbCommand.CommandType = CommandType.Text
                    dbCommand.CommandText = "UPDATE XXF_ASN_HEADERS SET BILL_OF_LADING_NUMBER ='" + BillOfLadingNumber + "', TRAILER_NUMBER ='" + TrailerNumber + "', CARRIER_CODE ='" + CarrierCode + "', TRANSPORTATION_METHOD ='" + TransportationMethod + "' WHERE HEADERID ='" + Request.QueryString("HeaderId") + "'"
                    dbCommand.ExecuteScalar()
                    dbTransaction.Commit()
                    Response.Redirect("default.aspx")
                Catch ex As OracleException
                    'Rollback the transaction
                    dbTransaction.Rollback()
                    'display error details
                    lblUpdateQuery.Text = dbCommand.CommandText
                    lblDebug.Text = ex.Message.ToString
                End Try

            End Using