private void AddJumperButton_Click(object sender, EventArgs e) { try { int jumperNumber = 0; if (JumperList.Count > 0) { jumperNumber = JumperList[JumperList.Count - 1].Number; } int _number = jumperNumber + 1; string _name = nameInput.Text.ToString(); string _country = countryInput.Text.ToString(); JumperList.Add(new Jumper(_number, _name, _country)); object[] row = { _number.ToString(), _name, _country }; JumperDataGrid.Rows.Add(row); nameInput.Clear(); countryInput.Clear(); } catch (Exception exception) { Console.WriteLine(exception.Message); } }