C# filter a DataGridView filled from csv file...

[sobrano]

Hello,
I filled up a DataGridView from a csv file using the code as follow:

Everything works and at the start I can see my DataGridView correctly filled up by datas from csv file.
The problem is that I am not able to filter the rows by textbox or sort the column by clicking on header word.
I tried differents ways by reading solution on the web but nothings works...
can anyone suggest me some solution for this pls?

private void LoadDatabaseBtn_Click(object sender, EventArgs e)
        {
            string filecsv = @"D:\Database.csv";
            DGV.DataSource = LoadCSV(filecsv);
            DGV.Refresh();
        }
        public List<Client> LoadCSV(string csvfile)
        {
           var query = from l in File.ReadAllLines(csvfile)
                        let data = l.Split(',')
                        select new Client
                        {
                            name= data[0],
                            id = data[1],
                            tel = data[2],
                            addr = data[3],
                            city = data[4],                         
                        };
            return query.ToList();
        }
    }
    public class Client
    {
        public string name { get; set; }
        public string id { get; set; }
        public string tel { get; set; }
        public string addr { get; set; }
        public string city { get; set; }   
    }

I have an identical database .mdf, in this case I added a DataSets to my c# project and I fill up my DataGridView just by setting the ClientsTableBindingSouce as source of data
In this case I am able to sort and filter very easly the rows of the datagridview at runtime just by typing text in a textbox.

private void filternameTxt_TextChanged(object sender, EventArgs e)
        {
            ClientsTableBindingSource.Filter = string.Format("name LIKE '%{0}%'", filternameTxt_Text);
            DGV.Refresh();
        }