How to use Parameterized Queries in OracleDataReader with stringbuilder in VB.Net?

Question

I have this code for retrive data from my oracle database:

Dim sb As New System.Text.StringBuilder
        sb.AppendLine("SELECT * FROM NOULGH")
        Using dar As Oracle.DataAccess.Client.OracleDataReader = Ibr.DataReader(sb.ToString)
            While dar.Read()
                page_no = dar("PRINT_NO").ToString()
                page_no1 = dar("PAGE_NO1").ToString()
            End While
        End Using

Now i want to retrieve the data from Oracle database using parameter.

Private Function createCSVBody(ByVal reader As String)
    Try
        Dim sb As New System.Text.StringBuilder
        sb.AppendLine("SELECT * FROM NOULGB WHERE PRINT_NO=@readerno")
        sb.AppendLine(New OracleParameter("@readerno", OracleDbType.Char, reader, ParameterDirection.Input).ToString)
        Using dar As Oracle.DataAccess.Client.OracleDataReader = Ibr.DataReader(sb.ToString)
            While dar.Read()
                page_no = dar("PRINT_NO").ToString()
                page_no1 = dar("PAGE_NO1").ToString()
        End Using
End Function

But it is not working for me. Can anybody help me?