how sloved this problem range of valid values. Parameter name: index

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ASP.NET

hi i have two page one MasterPage.master and default
i think this error for two table[0]
when run defualt.aspx this error see:

 Specified argument was out of the range of valid values.
Parameter name: index
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index

Source Error:


Line 88:             tbl.BorderWidth = 0;
Line 89:             tbl.Attributes.Add("Style", "text-align:right");
Line 90:             ImageButton ButtonPolls = (ImageButton)tbl.Controls[0];
Line 91:             ButtonPolls.ImageUrl = "../images/poll/CastVote.jpg";
Line 92:                     

this code use MasterPage.master

string strSQL = "select QuestionText from TPollQuestions where Iscurrent=1 and Isarchived=0";
          string cmdtext = "";
          SqlConnection conn = Conn;
          Pollcontrol1.CanVote = true;

          if (conn.State == System.Data.ConnectionState.Closed)
              conn.Open();

          cmdtext = "select QuestionText from TPollQuestions where Iscurrent=1 and Isarchived=0";
          cmd = new SqlCommand(cmdtext, conn);
          Pollcontrol1.PollQuestion = cmd.ExecuteScalar().ToString();
          conn.Close();
          cmdtext =
              "select optionID,PollID,OptionText,Votes from TPollOptions where pollID in(select PollID from TPollquestions where Iscurrent=1 and Isarchived=0)";
          SqlDataAdapter da = new SqlDataAdapter(cmdtext, conn);
          DataTable dt = new DataTable();
          da.Fill(dt);

          for (int i = 0; i < dt.Rows.Count; i++)
          {
              Pollcontrol1.AddPollAnswer(Convert.ToInt32(dt.Rows[i]["pollID"]), Convert.ToInt32(dt.Rows[i]["optionID"]), dt.Rows[i]["optionText"].ToString(), Convert.ToInt32(dt.Rows[i]["votes"]));
          }

          TableCell tbl = (TableCell)Pollcontrol1.Controls[0].Controls[Pollcontrol1.Controls[0].Controls.Count - 1].Controls[0];
          tbl.BorderWidth = 0;
          tbl.Attributes.Add("Style", "text-align:right");
          ImageButton ButtonPolls = (ImageButton)tbl.Controls[0];
          ButtonPolls.ImageUrl = "../images/poll/CastVote.jpg";

and this code in default.aspx

PagedDataSource pgsource = new PagedDataSource();
    int findex, lindex;
    DataRow dr1;
    static string str = "select *  from TNews where 1=1";
    protected void Page_Load(object sender, EventArgs e)
    {
   
        if (!IsPostBack)
        {
            //CurrentPage = 0;
     GetData(str);
        }
    }
   
    DataTable GetData(string str)
    {
        DataTable dtable1= new DataTable();

        SqlConnection Conn;
        SqlCommand Cmd;

        Conn = new SqlConnection(ConfigurationManager.ConnectionStrings["bakerConnectionString"].ToString());
        Cmd = new SqlCommand();
        Conn.Open();
        Cmd.Connection = Conn;

        Cmd.CommandText = str;

        SqlDataAdapter dap1= new SqlDataAdapter(Cmd);
        DataSet ds1 = new DataSet();
        dap1.Fill(ds1, "ds1");
        pgsource.DataSource = ds1.Tables[0].DefaultView;
        DataBind();
        return ds1.Tables[0];
    }