locking one column of a grid

Hi!
Can i lock first and second column of my grid from updation.
I have five columns in my tdbgrid in which the first two i want to populate with some default value and i want the user not be able to modify the values in first two columns. any idea to achieve this?

make first 2 cols as fixed.

I locked teh fiorst two columns at runtime.
Now the thing is that at form load event i wrote

tdbGrid.column(0).value="01"
tdbgrid.column(0).locked=true
tdbgrid.refresh

But it does not show the vallue 01 initially.
it shows the value only when i entered something in 3rd column or second column.
how to display the value at the very first instance.

tdbGrid.column(0).value="01"
tdbgrid.column(0).locked=true
try this

VB Code:

tdbgrid.column(0).locked=false
tdbGrid.column(0).value="01"

tdbgrid.column(0).locked=true