?using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //string a = "0123456789";
        //for (int i = 0; i < a.Length; i++)
        //{
        //    Response.Write(a[i].ToString() + "</br>");
        //}
        //int b = 0;
        //do
        //{
        //    Response.Write(b+"</br>");

        //}
        //while(b<10);
        string[] aa = new string[] {"aa","ab","ac","ad","ae","f","c" };
        foreach(string i in aa)
        {
          if(i.Contains("a"))
          {
              Response.Write(i.ToString() + "</br>");
          }
        }
;
    }
}