hi help pls

i got this textbox and if i enter a char eg.M
then program will search database in Access
for the 1st matching data and display on the textbox
but if the displayed data is not what i want
then i enter another char eg.A [that makes it become MA]
=> without clearing the textbox
and start entering char all over again
program will search database
for the next closest matching data
and display onto the textbox until data found

can anyone pls help in the coding
by giving mi sample codes
Urgent help needed
reply ASAP
with or without help its ok
: )

THK U