I wanna select some records from DataTable and got to bind in Dropdown list,Sometime i have to select where acc\_id =1 in dataTable , In some cases i have to select where acc\_id =1 and acc\_id=5 .
how do i use && operator ,The below query is working good if only one condition .if i added AND(&&) operator got nothing in Resultsets.

```
   DataTable dt = new DataTable();
        dt = ds.Tables[0];
        var query = from a in dt.AsEnumerable()
                    where a.Field<Int64>("acc_id") == 1 && a.Field<Int64>("acc_id") == 5
                    select a;

        dt = query.CopyToDataTable();
        ddlAccount.DataSource = dt;
        ddlAccount.DataTextField = "account_name";
        ddlAccount.DataValueField = "acc_id";
        ddlAccount.DataBind();

```

Assit me.