Serial port AT+CMGW command working fine while using breakpoint but not while debugging?

I am using wireless modem to send receive sms in my C# windows application.

I am trying to save sms to memory first and then send it like follwing:

When i executes this command:

AT+CMGW=66

(where '66' is PDU code length)

It gives me this, so far so good:

Then I enters PDU code + enter:

0011010B813032329896F500081D3400730061006100640020006B00680061006E002000240020006900730020002000250020006300680075002000610064006D0069

It gives me this, in which '26' shows me the memory index this message has been saved to:

+CMGW: 26

But the probelm is, above code does work fine when I uses breakpoint and sees step by step execution. And when I simple runs the code executing same AT commands, modem doesnt responses after entering PDU code + <enter key>.

Please help me.......Or if I want to send sms without saving it to memory in PDU format so how can I?

Serial port AT+CMGW command working fine while using breakpoint but not while debugging?

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