iframe with the server control

i got proble in the posting content from iframe to .net conroll
for example

in iframe i have
the following html code
<b>this is the test contebt<b>
<br>
<br>
<b>this is the second test <b>

i need to pass this code to normal .net controll

after posting this content is to be inserted in to database

please help me regarding this

thankyou