G'day KishKishore,

"I have an Entry/Text widget"

You've used the term "Entry/Text widget" multiple times. There are many widgets with either "Entry" or "Text" in their names; as far as I know, there are none with both. Here's a couple of guesses.

• If Tk::Entry, use the -state option and set it to "readonly".
• If Tk::Text, use Tk::ROText instead.

If it's not one of those, state precisely what you mean and provide a link so that there's no misunderstanding.