ASP.NET

regarding 70-513, can any one help me to find good video tutorial?

thanks in advance

<tr>
    <td class="style7" colspan="0">
        <asp:LinkButton ID="lbtn_reglas_negocio_ao0" runat="server" CausesValidation="False"
            Font-Underline="True" PostBackUrl="~/Pagina1.aspx"
            style="font-size: large">Consulta Ayudas de Oficina</asp:LinkButton>
    </td>
</tr>
<tr>
    <td class="style7" colspan="0">
        <asp:LinkButton ID="lbtnSalir" runat="server" CausesValidation="False"
            Font-Bold="True" Font-Overline="False" Font-Underline="True"
             style="font-size: large" onclientclick="window.close();">Salir</asp:LinkButton>
    </td>
</tr>

private string ToUnicode(string val)
{
    Encoding utf8 = Encoding.UTF8;
    Encoding unicode = Encoding.Unicode;

    byte[] utf8Bytes = utf8.GetBytes(val);

    byte[] unicodeBytes = Encoding.Convert(utf8, unicode, utf8Bytes);

    var result = ByteArrayToString(unicodeBytes);
    result = result.Substring(result.Length - 2, 2) + result.Substring(0, result.Length - 2);
    return result;
}

public static string ByteArrayToString(byte[] ba)
{
    StringBuilder hex = new StringBuilder(ba.Length * 2);
    foreach (byte b in ba)
        hex.AppendFormat("{0:x2}", b);
    return hex.ToString();
}