sql×¢Èë - .NET¼¼Êõ / C#

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ÏÂÃæÊÇ´úÂ룺string sql = "";
  Óû§ user = new Óû§();
  user.Name = textBox1.Text;
  user.MiMa = textBox2.Text;
  user.QMiMa = textBox3.Text;
  user.Sex = comboBox1.Text;
  user.Age = Convert.ToInt16(textBox4.Text);
  if (user.Name != null)
  {
  if (user.MiMa != null)
  {
  if (user.MiMa == user.QMiMa)
  {
  sql = "insert into user(Óû§Ãû,ÃÜÂë,ÄêÁä,ÐÔ±ð) values ('" + textBox1.Text + "'," + Convert.ToInt16(textBox2.Text) + "," + Convert.ToInt16(textBox4.Text) + ",'" + comboBox1.Text + "')";


   
   
  OleDbCommand command = new OleDbCommand(sql,con );
  con.Open();
  int num = Convert.ToInt32(command.ExecuteNonQuery());
  if (num == 1)
  {

  this.Close();
  }