private void button1_Click(object sender, EventArgs e) { try { if (textBox1.Text != null & textBox3.Text == "AsFCDF1Q3QWSW9fsFS0fd3vF7i29H") { this.Visible = false; login l = new login(); l.Show(); string str1 = ""; str1 = ConfigurationManager.ConnectionStrings["cn1"].ConnectionString; SqlConnection CN = new SqlConnection(str1); string qry = "insert into ser(Name_Company) values(@c1)"; SqlCommand SqlCom = new SqlCommand(qry, CN); SqlCom.Parameters.Add(new SqlParameter("@c1", (object)textBox1.Text)); CN.Open(); SqlCom.ExecuteNonQuery(); CN.Close(); } } catch (Exception er) { MsgBox.ShowMessage(this.Handle.ToInt32(), er.Message.ToString(), " خطا ", "تایید", "", "", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1, MessageBoxOptions.RightAlign); } }