"Integrated Security" just means to use the credentials of the account running your code. Unless the SQL Server is setup to accept the users Windows accounts as authentication, Integrated Security won't work. Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles. Dave Kreskowiak

What do you mean by it fail? It should have to give you issue/error but you did not mentioned that.

I think I got it, Thanks for the help! var q = from a1 in dt_Jobs.AsEnumerable() orderby a1.Field("City") where (a1.Field("City") != null) select a1.Field("City"); var lstCity = q.Distinct().ToList(); cboCity.DataSource = lstCity;