private void SignIn_Click(object sender, EventArgs e) { //con.Close(); String aid = Convert.ToString(NameSI.Text); try { con.Open(); com = new SqlCommand("SELECT * FROM SignUp WHERE Id= '" + NameSI.Text.ToString() + "'and Password='******'", con); da = new SqlDataAdapter(com); DataTable dt = new DataTable(); da.Fill(dt); SqlDataReader dr = com.ExecuteReader(); if (dt.Rows.Count > 0) { con.Close(); con.Open(); SqlCommand com = new SqlCommand("SELECT * FROM SignUp WHERE Id= " + int.Parse(NameSI.Text), con); dr = com.ExecuteReader(); if (dr.Read()) { try { String v = (dr["UserType"].ToString()); if (v == "Employee") { Empo empo = new Empo(); empo.Show(); // this.Close(); } else if (v == "Customer") { ViewItem viewItem = new ViewItem(); viewItem.Show(); //this.Close(); } else { Admin admin = new Admin(); admin.Show(); //this.Close(); } } catch (Exception ex) { MessageBox.Show(ex.Message); Close(); } } con.Close(); } else { MessageBox.Show("Your Id is not found"); } } catch (Exception ex) { MessageBox.Show(ex.Message); Close(); } }