private void button1_Click(object sender, EventArgs e) { if (!int.TryParse(CompanyYear.Text, out int n)) { return; } Company company = new Company(CompanyName.Text, int.Parse(CompanyYear.Text)); CompanyName.Clear(); CompanyYear.Clear(); CompanyList.Add(company); Companydata.DataSource = null; Companydata.DataSource = CompanyList; }