Thank you so much

it's working properly .....

we are use long messages send as per your given code from last one year and it's properly working
but we are going to make our company to aggregator so we require SMPP Server and SMPP client

when our client connected with our smpp server at that time
We receive multi part message from smpp server
and than we message send to operator multi part in different Concatenated short messages

that's why we need Concatenated short messages to send

We are try to send message with multi part and each message is in different row with total number of message , Part Number and reference Number
And we are use UserDataHeader and Esmclass as below code



clsSMS objSMS = (clsSMS)obj;
byte[] aaa = new byte[6];
aaa[0] = 0x05; // Field 1 (1 octet ...

when we send long message as below method

if ((DataCodings)Enum.Parse(typeof(DataCodings), objSMS.messageType.ToString()) == DataCodings.Default)
_client.MapEncoding(DataCodings.Default, Encoding.Default);

//code for send multiple message asynchronously
byte[] b = Encoding.ASCII.GetBytes(ID ...

can we use Optional Parameter in submit Complete event

as you suggest we create two table
sms_messages and sms_message_parts

but how we can find sms_message.id from submitcomplate event and map with sms_message_parts

how can i manage database in Async method

when i use sequence number then problem Getting in multy part message

how can i manage please suggest me

i send message with below code

//code for send multiple message asynchronously
ISubmitSmBuilder builder = SMS.ForSubmit()
.Text(objSMS.Message)
.From(SourcePrefix + (int)objSMS.messageType, (byte)SourceTon, (byte)SourceNPI)
.To(DestinationPrefix + objSMS.MobileNo, (byte)DestinationTon, (byte ...