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I am creating a wall using a UserControl ( which is a nested GridView) i want to load the rows of the GridView on scrolling down just like facebook. I am trying to implement this method.. Click MeClick here The example seems to read the last row's first column to get the last row which is loaded and to fetch next bunch of rows. I added a bound field to my UserControl's GridView but i guess i am not able to read the right value since i am getting error "Input string was not in a correct format." at ..

protected void btnGetMoreRecords_Click(object sender, EventArgs e)
        //Fetch 14 records initially.
        dt = dbo.FetchNextProducts(Convert.ToInt32(hiddenLastProductID.Value), 14, 42);

Its Convert.ToInt32(hiddenLastProductID.Value where i am getting the error.

and this is my aspx code of the usercontrol..

<asp:ScriptManager ID="sm1" runat="server">
            <asp:ScriptReference Path="~/ScriptsScroll/jquery-1.4.1.js" />
    <div id="divProducts" style="height:700px;overflow-x:hidden;overflow-y: scroll;">
<table cellpadding="0" cellspacing="1" border="0">
        <td align="left">
            <asp:GridView ID="GridViewUserScraps" ItemStyle-VerticalAlign="Top" AutoGenerateColumns="False"
                GridLines="None" Width="100%" ShowHeader="False" runat="server" AlternatingRowStyle-BackColor="#A5A5A5"
                CellPadding="4" ForeColor="#333333" DataKeyNames="ScrapId" OnRowCommand="GridViewRowCommand">
                    <asp:BoundField DataField="id" />
                            <asp:LinkButton ID="LinkButton1" runat="server">Load More</asp:LinkButton>
                            <table align="left" cellpadding="1" cellspacing="2">
                                        <a href='<%#getUserHREF(Container.DataItem)%>'>
                                            <img align="middle" src='<%#getSRC(Container.DataItem)%>' border="0" width="50px" />
Posted 16-Apr-13 21:55pm
Updated 16-Apr-13 22:16pm
johannesnestler 17-Apr-13 4:21am
Let the Debugger run and look what hiddenLastProductID.Value is when you get that exception. Should be easy to figure out why this string is not convertible to an Int32.

1 solution

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Solution 1

Check the value of your hiddenfield before converting it to integer. This problem may occur due to an empty string in HiddenField.
Try this:
protected void btnGetMoreRecords_Click(object sender, EventArgs e)
    if(hiddenLastProductID.Value.Trim() != ""){
        //Fetch 14 records initially.
        dt = dbo.FetchNextProducts(Convert.ToInt32(hiddenLastProductID.Value.Trim()), 14, 42);

arbaaz jalil 17-Apr-13 4:44am
Yup it is Null its empty but how can i solve it? why is it empty?
_Amy 17-Apr-13 4:53am
That can be solved by you only. Put a breakpoint and debug the code. You, probably will able to find the causes which is making your HiddenField null or empty. Good Luck!
arbaaz jalil 17-Apr-13 5:04am
I think its because it is unable to detect the value within td which is generated on runtime by the nested gridview.

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