How to set non-editable cell in excel

[murugavelmsc]

Hi,

I have a worksheet with dependent value.
For eg. when i am select a2 value from the list, b2 cell have values depend on the a2 cell. (b2 contains some formula)
But i want to non-editable the b2 cell (user cannot edit the formula)

Plz help me.

Thanks,
Murugavel