string sql = "inesrt into UserSInfo (UserNum,UserName,UserSex,UserAge,College,Class,Gra,Tel,Remark) values ('" + textBox1.Text.Trim() + "','" + textBox2.Text.Trim() + "','男','" + textBox2.Text.Trim() + "','" + textBox3.Text.Trim() + "','" + textBox4.Text.Trim() + "','" + comboBox1.Text+ "','" + textBox5.Text.Trim() + "','" + textBox6.Text.Trim() + "')";