Disabling some field in a ms access form

[saikat19961998]

hello,

I have a form C_details with several fields.



i have 2 fields.....1) emp no 2)emp name

if the value of these two fields are same corresponding to a previous entry, i like to lock some certain fields of the form and these locked field should carry the same value entered previously.

Please help me with the code. Its urgent.
Thanks in advance.