gtk text entry

[srinivas <srinivas comodo com>]

hi all;

   i am developing gui with glade and c. now i have a "text entry" and
"next button" widget. when i press next button the next frame will be
shown, but before displaying the next frame i would like to check
whether text entry had filled with some text or not. if it is filled
then the frame will be displayed, if not i will give pop up msg saying
enter text b'fore pressing next. how to check the text presence in text
entry.

thanks & regards;

vasu.