i am troubling with timer. to handle its time.

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C#

ASP.NET

Ajax

i have a problem with timer control when i click on next button continuously it stop . when i stop to click next button it again start...i want that timer should not stop when i click on next button continuously.please help me its urgent
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My aspx code is:

<asp:Content ID="Content1" ContentPlaceHolderID="cphmain" runat="Server">

    <div id="contents">
        <div id="maindiv" style="padding-removed 100px; width:850px;">
            <asp:ScriptManager ID="ScriptManager1" runat="server">
            
            <table>
            <tr>
            <td>
            <input type="button" value="Start count!" onclick="doTimer()"/></td>
            <td>
                <input id="txt1" type="text" />
                <div id="txt"></div>
                <asp:Label ID="Label1" runat="server" Text="Label"> 
                
</td>
<td>
<input type="button" value="Stop count!" onclick="stopCount()"/>
            </td>
            </tr>
            </table>
                <asp:UpdatePanel ID="UpdatePanel2" runat="server">
                <contenttemplate>
                <div>
                <asp:Timer ID="Timer1" runat="server" ontick="Timer1_Tick" Interval="500">
                
                <asp:Label ID="lbltimer" runat="server" Text="Label">
            </div>
            </contenttemplate>
                
                <asp:UpdatePanel ID="UpdatePanel3" runat="server">
                <contenttemplate>
            <asp:Panel ID="panel1" runat="server">
            <table>
            <tr>
            <td style="width:auto;">
                <asp:Label ID="lblquestun" runat="server" Text="label"></td>
                
            </tr>
            
            
            </table>
            <table>
            <tr>
            <td>
                <asp:RadioButton ID="radA" runat="server" GroupName="grp1" Text="rad1"/></td>
            <td>
                <asp:RadioButton ID="radB" runat="server" GroupName="grp1" Text="rd2"/></td>
            </tr>
            <tr>
            <td>
                <asp:RadioButton ID="radC" runat="server" GroupName="grp1" Text="rd3"/></td>
            <td>
                <asp:RadioButton ID="radD" runat="server" GroupName="grp1" Text="rd4"/></td>
            </tr>
            <tr>
            <td colspan="2" align="right">
                </td>
                
            </tr>
            </table>
                <table>
                <tr>
                <td><asp:Button ID="Button1" runat="server" Text="Next" GroupName="grp1" 
                    onclick="Button1_Click1"/></td>
                </tr>
                </table>
                
            
            </contenttemplate>
            
        </div>
    </div>

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My cs code is:

static DataTable dt = new DataTable();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            csQuestun obj = new csQuestun();
            dt = obj.GetQuestun();
            string str;
            str = dt.Rows[0][0].ToString();
            lblquestun.Text = "1: " + str;
            radA.Text = dt.Rows[0][1].ToString();
            radB.Text = dt.Rows[0][2].ToString();
            radC.Text = dt.Rows[0][3].ToString();
            radD.Text = dt.Rows[0][4].ToString();
            lbltimer.Text = DateTime.Now.ToLongTimeString();  
        }
    }
 static int count = 1;
    static int NOcount = 2;
    protected void Button1_Click1(object sender, EventArgs e)
    {
        try
        {
            string str = null;

            if (count < dt.Rows.Count)
            {
                str = dt.Rows[count][0].ToString();
                lblquestun.Text = NOcount.ToString() + ": " + str;
                radA.Text = dt.Rows[count][1].ToString();
                radB.Text = dt.Rows[count][2].ToString();
                radC.Text = dt.Rows[count][3].ToString();
                radD.Text = dt.Rows[count][4].ToString();
                count++;
                NOcount++;
            }
            else
            {
                lblquestun.Text = "End";
                count = 1;
            }
            //WebControl cnt = (WebControl)Page.FindControl("txt");
            //Label1.Text = cnt.ToString();
            
        }
        catch (Exception)
        { }
    }
protected void Timer1_Tick(object sender, EventArgs e)
    {
        lbltimer.Text = DateTime.Now.ToString("mm:ss");
    }

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thaxxx for advance