The Rows Deleted From DataBase but the Rows in The DataTable remain unchanged :(

Question

this is my code note : the code work without any error , and the required change to database is done successfuly , but the rows in DATATABLE remain unchanged after delete them by datatable.removeat() method: protected void btnBlock_Click(object sender, EventArgs e) { Guid UserId = (Guid)Session["UserId"]; if (UserId != null) { Contact contact1 = new Contact(); DataTable dt = new DataTable(); DataTable dt2 = new DataTable(); dt2 = (DataTable)ViewState["BlockedContact"]; dt = (DataTable)ViewState["contactlist"]; if (dt != null) { int count = 0; int count2 = 0; DataRow row = null; SetData(); gvContacts.AllowPaging = false; gvContacts.DataBind(); ArrayList arr = (ArrayList)ViewState["SelectedRecords"]; count = arr.Count; for (int i = 0; i < gvContacts.Rows.Count; i++) { for (int x = 0; x < dt.Rows.Count-1 ; x++) { if (arr.Contains(gvContacts.DataKeys[i].Value)) { /// this code block user successfuly from database contact1.BlockUser(gvContacts.DataKeys[i].Value.ToString(), UserId); if (dt.Rows[x][0].ToString() == gvContacts.DataKeys[i].Value.ToString()) { dt.Rows.RemoveAt(count2); row = dt.NewRow(); dt2.Rows.Add(); dt2.Rows[dt2.Rows.Count - 1]["ImageID"] = row["ImageID"]; dt2.Rows[dt2.Rows.Count - 1]["UserName"] = row["UserName"]; dt.Rows[dt2.Rows.Count - 1]["FirstName"] = row["FirstName"]; dt2.Rows[dt2.Rows.Count - 1]["LastName"] = row["LastName"]; dt2.Rows[dt2.Rows.Count - 1]["LastActivityDate"] = row["LastActivityDate"]; dt.Rows.RemoveAt(count2); arr.Remove(gvContacts.DataKeys[i].Value); } } } } ViewState["BlockedContact"] = dt2; ViewState["contactlist"] = dt; ViewState["SelectedRecords"] = arr; hfCount.Value = "0"; gvContacts.AllowPaging = true; gvContacts.DataSource = dt2; gvContacts.DataBind(); ShowMessage(count); } } }