Postback Problem with Firefox

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C#

Dear All,

i have two textbox like to_date and from_date with two ajax calendar. i have third textox to calculate total days between two selected dates. i use this page in scriptmanager with updatepanel.

so, problem is that when i use firefox browser and select from date and then to date it does not get postback and not calculate the total days in third textbox.

so, what can i do ?

it works perfact in google chrome but not in IE or Firefox... i just write the code into to_date event.

 protected void txt_to_date_TextChanged(object sender, EventArgs e)
    {
        IFormatProvider theCultureInfo = new System.Globalization.CultureInfo("en-GB", true);
        DateTime from_date = DateTime.ParseExact(txt_from_date.Text, "dd/MM/yyyy", theCultureInfo);
        DateTime to = DateTime.ParseExact(txt_to_date.Text, "dd/MM/yyyy", theCultureInfo);
        int result = DateTime.Compare(to, from_date);
        if (result < 0)
        {
            txt_to_date.Text = "";
            txt_to_date.Focus();
            lbl_msg.Visible = true;
            lbl_msg.ForeColor = System.Drawing.Color.Red;
            lbl_msg.Text = "To date is not Less than your From Date";
            txt_total_days.Text = "";
        }
        else if (result == 0)
        {
            txt_total_days.Text = "1";
            Panel1.Visible = true;
        }
        else 
        {
            Panel2.Visible = false;
            Panel1.Visible = false;
            txt_total_days.Text = ((to - from_date).TotalDays + 1).ToString();
        }
    }

the ASPX code like :


<asp:ScriptManager ID="s1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="up1" runat="server">
<ContentTemplate>
<table border="1" width="100%">

<tr>
<td align="center" colspan="2">
    <asp:Label ID="Label1" runat="server" Text="Online Leave Application" 
        Font-Size="Large" ForeColor="Black" Font-Bold="True"></asp:Label>
</td>
</tr>

<tr>
<td align="left">
    <asp:Label ID="Label2" runat="server" Text="Date" Font-Size="Medium" 
        ForeColor="Black"></asp:Label>
</td>
<td align="left">
    <asp:TextBox ID="txt_date" runat="server" Columns="20" 
        Font-Size="Medium" Enabled="False"></asp:TextBox>
</td>
</tr>



<tr>
<td align="left">
    <asp:Label ID="Label5" runat="server" Text="From Date" Font-Size="Medium" 
        ForeColor="Black"></asp:Label>
</td>
<td align="left">
    <asp:TextBox ID="txt_from_date" runat="server" Columns="20"  
        ValidationGroup="temp" Font-Size="Medium" Enabled="False"></asp:TextBox>
      <asp:ImageButton ID="ImageButton1" runat="server" Height="25px" 
            ImageUrl="~/Images1/calendar.jpg" Width="30px" ValidationGroup="temp" 
        onclick="ImageButton1_Click1"/>
            
        <ajax:CalendarExtender ID="CalendarExtender1"  runat="server" PopupButtonID="ImageButton1" TargetControlID="txt_from_date"  OnClientDateSelectionChanged="chkdate" Format="dd/MM/yyyy">
        </ajax:CalendarExtender>
       
        
</td>
</tr>


<tr>
<td align="left">
    <asp:Label ID="Label6" runat="server" Text="To Date" Font-Size="Medium" 
        ForeColor="Black"></asp:Label>
</td>
<td align="left">
    <asp:TextBox ID="txt_to_date" runat="server" Columns="20"  
        ValidationGroup="temp1" Font-Size="Medium" Enabled="False" 
        EnableTheming="True" ontextchanged="txt_to_date_TextChanged" 
        AutoPostBack="True"></asp:TextBox>
      <asp:ImageButton ID="ImageButton2" runat="server" Height="25px" 
            ImageUrl="~/Images1/calendar.jpg" Width="30px" ValidationGroup="temp1" 
        onclick="ImageButton2_Click" />
           
        <ajax:CalendarExtender ID="CalendarExtender2"  runat="server" PopupButtonID="ImageButton2" TargetControlID="txt_to_date"  OnClientDateSelectionChanged="chkdate" Format="dd/MM/yyyy">
        </ajax:CalendarExtender>
      <asp:CustomValidator ID="scdt1" runat="server" OnServerValidate="chkdate1" ErrorMessage="To date not less than From date" ControlToValidate="txt_from_date"></asp:CustomValidator>
</td>
</tr>
<tr>
<td align="left">
     <asp:Label ID="Label9" runat="server" Text="Total Leave(s) Day(s)" Font-Size="Medium" 
        ForeColor="Black"></asp:Label>
</td>
<td align="left">
    <asp:TextBox ID="txt_total_days" runat="server" Text="0" Enabled="false" 
        Font-Size="Medium" ForeColor="Black"></asp:TextBox>
</td>
</tr>

<tr>

<td align="center" colspan="2">
<asp:Panel ID="Panel1" runat="server" Visible="false"> 
     <asp:RadioButton ID="rd_full" runat="server" Text="Full Day Leave" 
         GroupName="a" Checked="true" AutoPostBack="True" Font-Size="Medium" 
         ForeColor="Black" oncheckedchanged="rd_full_CheckedChanged" />
     <asp:RadioButton ID="rd_half" runat="server" Text="Half Day Leave" 
         GroupName="a" AutoPostBack="True" Font-Size="Medium" ForeColor="Black" 
         oncheckedchanged="rd_half_CheckedChanged" />
         </asp:Panel>
</td>
</tr>



<tr>

<td align="center" colspan="2">
<asp:Panel ID="Panel2" runat="server" Visible="false">
     <asp:RadioButton ID="rd_first_half" runat="server" Text="First Half" 
         GroupName="b" Checked="true"  Font-Size="Medium" 
         ForeColor="Black" oncheckedchanged="rd_first_half_CheckedChanged" />
     <asp:RadioButton ID="rd_second_half" runat="server" Text="Second Half" 
         GroupName="b"  Font-Size="Medium" ForeColor="Black" />
         </asp:Panel>
</td>

</tr>

<tr>
<td align="left">
    <asp:Label ID="Label8" runat="server" Text="Enter Reason" Font-Size="Medium" 
        ForeColor="Black"></asp:Label>
</td>
<td align="left">
    <asp:TextBox ID="txt_reason" runat="server" TextMode="MultiLine" 
        Font-Size="Large" ForeColor="Black" Height="150px" Width="450px" 
        ></asp:TextBox>
</td>
</tr>

<tr>
<td align="left">
    <asp:Label ID="Label7" runat="server" Text="Report To Whom" Font-Size="Medium" 
        ForeColor="Black"></asp:Label>
</td>
<td align="left">
    <asp:TextBox ID="TextBox1" runat="server" Columns="45" Font-Size="Medium" 
        ForeColor="Black" Enabled="False"></asp:TextBox>
</td>
</tr>

<tr>
<td align="center" colspan="2">
    <asp:Button ID="Button1" runat="server" Text="Submit" Font-Size="Large" 
        ForeColor="Black" Width="30%" OnClientClick="return validate()" onclick="Button1_Click1" 
         />
</td>
</tr>
<tr>
<td align="center" colspan="2">
<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="up1">
<ProgressTemplate>
<div align="center" style="color: #000000">
     <img src="images/progress.gif" align="middle" height="20" /> Please Wait ...
     </div>
</ProgressTemplate>
</asp:UpdateProgress>
</td>
</tr>
<tr>
<td align="center" colspan="2">
    <asp:Label ID="lbl_msg" runat="server" Font-Size="Medium" ForeColor="Green" 
        Visible="False"></asp:Label>
</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>

please help me....

if i remove the Enable=false to the both textbox, it works fine in FIREFOX but i want to not editable that textbox by the user.

Thanks and Regards....
Mitesh