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hi all

Problem is I have hidden variable and stored a value to hidden variable through javascript
while retrieving hidden varaible from code behind it is retrieved as empty value

javascript code is
function CalculateTotalAmountWithLoadingCharge() {
var loadingValue = parseFloat(document.getElementById('<%= txtLoadingcharge.ClientID %>').value)
if (loadingValue >= 0) {
document.getElementById('<%= hdnLoadingCharge.ClientID %>').value = loadingValue
document.getElementById('<%= hdnLoadingChargeTemp.ClientID %>').value = "valuechanged";


<asp:UpdatePanel ID="upHiddenField" runat="server" >
<asp:HiddenField ID="hdnQuantity" runat="server" />
<asp:HiddenField ID="hdnLoadingCharge" runat="server" />

<asp:UpdatePanel ID="upFreightType" runat="server"  UpdateMode="Conditional" >
                <asp:TextBox ID="txtQuantity"  runat="server" CssClass="textBox" Text="1" onchange="onchangeQuantity();" Width="40px" />
                <asp:TextBox ID="txtBasicAmount" runat="server" onchange="BasicAmountChange()" Text="0"  CssClass="textBox" Width="160px" />
             <tr align="left">
           <td  style="width:100%;">--%>
                <asp:Label ID="lblLoadingCharge" runat="server" Text="Loading Charge:" CssClass="label" />
                 <asp:TextBox ID="txtLoadingcharge" runat="server" CssClass="textBox" Text="0" onchange="CalculateTotalAmountWithLoadingCharge()" Width="160px" />
                 <asp:Label ID="lblTotalAmount" runat="server" Text="Total Amount:" CssClass="label" />
                <asp:TextBox ID="txtTotalAmount"  runat="server" Text="0" CssClass="textBox"  Width="160px" />
        <asp:AsyncPostBackTrigger ControlID="ddlFreightType" EventName="SelectedIndexChanged" />

<asp:Button ID="btnSave" runat="server" Text="Book" CssClass="button" Width="160px" OnClientClick="CalculateTotalAmountWithLoadingCharge();" />

in code behind

Dim loadingcharge As Integer=hdnLoadingCharge.Value

I have update panel to get value to retrieve the value on dropdown selected index changed that works fine after retrieving the value i process and store it in hidden variable while trying
to access it in my code behind the value of hidden variable is empty string (i.e) "".

How can i retrieve the hidden variable value from code behind

Thanks in advance . what have i done wrong
Updated 23-Jun-13 10:11am
Thanks7872 23-Jun-13 13:50pm    
Rremove unnecessary code. No one would like to go through this lengthy codeblock.
RahulRana723 24-Jun-13 1:08am    
Try to use only one update panel instead of two..
vaibhav10Dec1987 27-Jun-13 3:57am    
Try to use "AsyncPostBackTrigger" for Control Id "txtLoadingcharge".

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