C#根据身份证号码判断出生日期和性别

/// <summary>/// 在控件验证 textBox_IdentityCard 的 Validated事件中定义身份证号码的合法性并根据身份证号码得到生日和性别 /// </summary>private void textBox_IdentityCard_Validated(object sender, EventArgs e){  try  {    //获取得到输入的身份证号码    string identityCard = textBox_IdentityCard.Text.Trim();    if (string.IsNullOrEmpty(identityCard))    {      //身份证号码不能为空，如果为空返回      MessageBox.Show("身份证号码不能为空！");      if (textBox_IdentityCard.CanFocus)      {        textBox_IdentityCard.Focus();//设置当前输入焦点为textBox_IdentityCard      }      return;    }    else    {      //身份证号码只能为15位或18位其它不合法      if (identityCard.Length != 15 && identityCard.Length != 18)      {        MessageBox.Show("身份证号码为15位或18位，请检查！");        if (textBox_IdentityCard.CanFocus)        {          textBox_IdentityCard.Focus();        }        return;      }    }    string birthday = "";    string sex = "";    //处理18位的身份证号码从号码中得到生日和性别代码    if (identityCard.Length == 18)    {      birthday = identityCard.Substring(6, 4) + "-" + identityCard.Substring(10, 2) + "-" + identityCard.Substring(12, 2);      sex = identityCard.Substring(14, 3);    }<br>    //处理15位的身份证号码从号码中得到生日和性别代码    if (identityCard.Length == 15)    {      birthday = "19" + identityCard.Substring(6, 2) + "-" + identityCard.Substring(8, 2) + "-" + identityCard.Substring(10, 2);      sex = identityCard.Substring(12, 3);    }<br>    textBox_Birthday.Text = birthday;    //性别代码为偶数是女性奇数为男性    if (int.Parse(sex) % 2 == 0)    {      this.comboBox_Sex.Text = "女";    }    else    {      this.comboBox_Sex.Text = "男";    }  }  catch (Exception ex)  {    MessageBox.Show("身份证号码输入有误");    if (textBox_IdentityCard.CanFocus)    {      textBox_IdentityCard.Focus();    }    return;  }}