I am assuming that you need functionality like the like operator of the sql server here are useful links
let me know if you have any question
Actuallly my requirement is not matching with that like operator,situation is that i have to gievn two specified castno(in string format) by two AutoComplete boxes in client side and within that range all castno should be filter by linq and display all information of those castno into datagrid .
my all records should be presented in Obserable list(i.e ladllist). i m using this code but it is not working
var s =from p in ladlelist
where p.cast_no>=txtStartcastno.text && p.cast_no<=txtEnscastno
pls help me to resolve this problem