public void Login() { Int64 pp; string pass; pp = Convert.ToInt64(F.fursanpp.Text); pass = F.fursanpass.Text; MessageBox.Show(Convert.ToString(pp)); if (F.fursanpp.Text != "" && F.fursanpass.Text != "" && F.fursanpp.Text.Length == 7) { string query1 = "select ppnumber,pass from fursan where ppnumber = '" + pp + "' and pass = '******'"; SqlDataAdapter adapter = new SqlDataAdapter(query1, connec); connec.Open(); DataTable dt = new DataTable(); adapter.Fill(dt); if (dt.Rows.Count > 0) { MessageBox.Show("Log In successful", "Log IN", MessageBoxButtons.OK, MessageBoxIcon.Information); Fursan f = new Fursan(); f.check = 1; F.Hide(); } else { MessageBox.Show("Incorrect Passport Number or password", "Log In", MessageBoxButtons.OK, MessageBoxIcon.Error); } } else { MessageBox.Show("Incorrect Passport Number or password", "Log In", MessageBoxButtons.OK, MessageBoxIcon.Error); if (F.fursanpp.Text.Length != 7) { MessageBox.Show("Please enter passport number of 7 digits", "Log In", MessageBoxButtons.OK, MessageBoxIcon.Error); } } connec.Close(); }