private void btOk_Click(object sender, EventArgs e) { string findSql = "select * from DT_career where classnum ='" + tBcnu.Text + "'"; string insertSql = "insert into DT_career" + "(classnum,classname)" + "values('" + tBcnu.Text + "','" + tbCna.Text + "')"; SqlHelp sqlHelper = new TryDBMS.SqlHelp(); int count1 = sqlHelper.SqlServerRecordCount(findSql); if (count1 > 0) { wrong1(); } int count2 = sqlHelper.ExecuteNonQueryCount(insertSql); if (count2 > 0) { right(); } Hide(); }