How to force refresh the DataGridView's content?

I want to make a sorted datagridview input. The following code snippet doesn't quite cut it; even if i put a grd.Refresh, the datagridview doesn't show its updated values. If i press arrow down key and go up again, the grid is refreshing. Is there any other way i can force refresh to datagridview's content? ``` using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace TestSortedInput { public partial class Form1 : Form { DataTable _dt = new DataTable(); public Form1() { InitializeComponent(); grd.AllowUserToAddRows = false; _dt.Columns.Add("sort", typeof(int)); _dt.Columns.Add("product", typeof(string)); _dt.DefaultView.Sort = "sort"; grd.DataSource = _dt; } private void dataGridView1_KeyUp(object sender, KeyEventArgs e) { if (e.KeyCode == Keys.Insert) { if (e.Modifiers == 0) { var r = _dt.NewRow(); r["sort"] = _dt.DefaultView.Count + 1; r["product"] = ""; _dt.Rows.Add(r); } else if (e.Alt) { var drv = this.BindingContext[_dt].Current as DataRowView; int sort = (int)drv["sort"]; for (int i = _dt.DefaultView.Count - 1; i >= (int)drv["sort"] - 1; --i) { _dt.DefaultView[i]["sort"] = (int) _dt.DefaultView[i]["sort"] + 1; } var r = _dt.NewRow(); r["sort"] = sort; _dt.Rows.Add(r); grd.Refresh(); } } }//void } } ```