is this code correct or not

Try
            Dim sql As String = "SELECT MAX(ppo_no) FROM Pension_Master where state_code= '" & TextBox9.Text & "' "
            Dim comm As SqlCommand = New SqlCommand(sql, myconn)
            myReader = comm.ExecuteReader
            If myReader.HasRows Then
                While myReader.Read()
                    temp = myReader.Item("TextBox5.Text") + ("TextBox9.Text")
                End While
            End If

        Catch ex As Exception

        End Try

        TextBox8.Text = String.Concat(temp)
        'TextBox8.Text = TextBox5.Text & TextBox9.Text
        myReader.Close()

        cmd.ExecuteNonQuery()