GSM modem interfacing

hi,i m interfacing gsm modem to my microcontroller.i need to send sms
through it.
i am using AT commands for that.the command to send sms (AT+ CMGS)
terminates with
ctrl-Z.now in my program i hav tried all ways to send ctrl-Z at end of
my sms.but it takes this as
a character or string only.also i tried with ascii value of ctrl-Z but
of no use.

i am able to see the transmitted commands on hyper-terminal through
serial interface & also on serail window while debugging.
the commands are as follows with 2ms delay between each of them.

AT , AT+CMGF = 1, AT+CMGS = mobile no. , "message to be sent " ctrl-Z /
26 / ^Z


plz suggest some way.suggestions are also invited if you suspect some
other problem .

.

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