判断注册时密码不能小于8位

private void RegButton_Click(object sender, System.EventArgs e)
 {
   if(password.Text.Length<8)
   {
    Page.Response.Write("<script language='javascript'>alert('密码长度不能小于8位！');</script>");
    
   }
   else
   {
        .....................................
   }
}