private byte[] PacketField48()
{
string field48 = "C0v22901510000" + UserID.PadLeft(40, ' ') + "000000" + "2";
byte[] tmp = Encoding.Default.GetBytes(field48);
TLVHandler handler = new TLVHandler();
handler.AddTag("BF12", SelectRecordInfo[0]);
byte[] content = handler.GetTLVWithLength(3);
byte[] result = new byte[tmp.Length + content.Length];
Array.Copy(tmp, result, tmp.Length);
Array.Copy(content, 0, result, tmp.Length, content.Length);
return(result);
}