sql = "INSERT INTO STUINFO (STUNAME,STUID) VALUES('"+姓名值 +"'," +ID值 + ")"
修改:
sql = "UPDATE STUINFO SET STUNAME='" + 姓名值 + "' WHERE STUID= " + ID值
處理妳的 string sql = "delete from StuInfo where stuId="+comboBoxStu.SelectedValue; 這壹行就可以