Select query on datatable for filter data

I go through lots of site for select query on datatable. But most of the time I not get suitable solution. So, at last I use linq to filter data from datatable. So I share my code below:
 
DataTable dt = new DataTable();
string sqlStatement1 = "select * from hsswith_view where cp_amount<='" + bug_amount + "' and no_of_days >='" + no_of_days + "'  or ep_amount<='" +
bug_amount + "' and no_of_days >='" + no_of_days + "'";
SqlCommand sqlCmd1 = new SqlCommand(sqlStatement1, connection);
SqlDataAdapter sqlDa1 = new SqlDataAdapter(sqlCmd1);
sqlDa1.Fill(dt1);
var query = from r in dt1.AsEnumerable()
where r.Field<string>("pax") == no_person 
select new
{
       entry_id = r["entry_id"].ToString(),
       pax = r["pax"].ToString(),
       package = r["package"].ToString(),
       no_of_days = r["no_of_days"].ToString(),
       cp_amount = r["cp_amount"].ToString(),
       ep_amount = r["ep_amount"].ToString()
};
GridView1.DataSource = query;
GridView1.DataBind();
 
First of all I select data using one select query and fill it at datatable(dt1). Now I write linq query to extract data from dt1 datatble and bind the values at gridview. These much.