Dear Experts

I have a combobox that holds following values

620
621
622
623
624

and tables with above names are in Data Environment like
620.dbf and 621.dbf etc.

On the click event of command1, I have following codes

db1=alltrim(thisform.combo2.value)

select *;
from &db1;
where phone=thisform.text1.value;
into cursor abc

But when I run this command then it shows this error message

File ‘620.dbf’ does not exists

Please modify my query