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protected void Button1_Click(object sender, EventArgs e)        {            String filenmae = MapPath("~/") + "file.txt";            FileUpload1.SaveAs(filenmae);            StreamReader sr = new StreamReader(filenmae, System.Text.Encoding.Default);            String input = sr.ReadToEnd();            sr.Close();            string act = DropDownList1.Text;            //Response.Write(act);            string[] arr =null;            string[] arrTemp = null;            //List
    
      listString = new List
     
      ();            switch(act){                case "0":                    arr = input.Split('\n');                    for (int i = 0; i < 10; i++)                    {                        Response.Write(arr[i] + "
      
");                    }                    break;                case "1":                   arrTemp = input.Split('\n');                   List
      
        arr1 = new List
       
        ();                   List
        
          arr2 = new List
         
          (); int j = 0; for (int i = 0; i < arrTemp.Length; i++) { j = i / 2; if (i % 2 == 0) { arr1.Add(arrTemp[i]); }else { arr2.Add(arrTemp[i]); } //Response.Write(i/2+"
          
"); } for (int i = 0; i < arr2.Count; i++) { Response.Write(arr1[i] + ":" + arr2[i] + "
          
"); } break; } Response.End(); input = input.Replace("/r/n", "
          
").Replace("/n", "
          
"); Response.Write(input); Response.End(); }