DoCmd Problem In ASP

I am trying to develop a page where users can click on alphabets to look for a company name that starts with the selected letter.
Searching through the forums i came across the method of using DoCmd.

alpha = Request.QueryString("alp")
if alpha <> "" then
DoCmd.ApplyFilter "", "[com_name] Like ""[" & alpha & "]*"""
end if

The 'alpha' variable here holds the alphabet selected by user from another page. However, I'm getting an error message saying

Microsoft VBScript runtime (0x800A01F4)
Variable is undefined: 'DoCmd'

Initially i tried the usual filtering

if alpha <> "" then
rs.Filter = "com_name LIKE " & alpha
end if

The pages are suppose to display records in 10s. But instead of showing only the records of company starting "A" (example) it shows everything.

Please kindly point me to the correct direction to solve this problem.

Thank you so much.

-meiyeen-