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BOOK: Beginning ASP.NET 4 : in C# and VB
This is the forum to discuss the Wrox book Beginning ASP.NET 4: in C# and VB by Imar Spaanjaars; ISBN: 9780470502211
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Old July 9th, 2010, 03:14 PM
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Default Chpt 13 Updating a review

Hi All.
All was going well with the chapter until I tried to update a review. I can insert a review just fine but when I try to update a review I get an exception error. "systemFormatException: input string was not in correct format. I noticed that when I place the mouse courser over the review I see an id0 instead of the action ID number of the review. I am not sure what code you need to see to help, so I am inserting the reviews.aspx page.
Code:
<%@ Page Title="Planet Wrox - Management - Reviews" Language="C#" MasterPageFile="~/MasterPages/Management.master" AutoEventWireup="true" CodeFile="Reviews.aspx.cs" Inherits="Management_Reviews" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="cpMainContent" Runat="Server">
    <asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="True" 
        AutoPostBack="True" DataSourceID="SqlDataSource1" DataTextField="Name" 
        DataValueField="Id">
        <asp:ListItem Value="">Make a selection</asp:ListItem>
    </asp:DropDownList>
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="Id" DataSourceID="SqlDataSource2">
        <Columns>
            <asp:HyperLinkField DataNavigateUrlFields="Id" 
                DataNavigateUrlFormatString="AddEditReview.aspx?Id=(0)" DataTextField="Title" 
                HeaderText="Title" />
            <asp:TemplateField HeaderText="Authorized" SortExpression="Authorized">
                <ItemTemplate>
                    <asp:Label ID="AuthorizedLabel" runat="server" Text='<%# GetBooleanText(Eval("Authorized")) %>' />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="CreateDateTime" DataFormatString="{0:g}" 
                HeaderText="CreateDateTime" HtmlEncodeFormatString="True" SortExpression="CreateDateTime" />
            <asp:CommandField HeaderText="Delete" ShowDeleteButton="True" />
        </Columns>
    </asp:GridView>
    <a href="AddEditReview.aspx">Insert New Review</a><asp:SqlDataSource ID="SqlDataSource2" runat="server" 
        ConnectionString="<%$ ConnectionStrings:PlanetWroxConnectionString1 %>" 
        DeleteCommand="DELETE FROM [Review] WHERE [Id] = @Id" 
        InsertCommand="INSERT INTO [Review] ([Title], [Authorized], [CreateDateTime]) VALUES (@Title, @Authorized, @CreateDateTime)" 
        SelectCommand="SELECT [Id], [Title], [Authorized], [CreateDateTime] FROM [Review] WHERE ([GenreId] = @GenreId)" 
        UpdateCommand="UPDATE [Review] SET [Title] = @Title, [Authorized] = @Authorized, [CreateDateTime] = @CreateDateTime WHERE [Id] = @Id">
        <DeleteParameters>
            <asp:Parameter Name="Id" Type="Int32" />
        </DeleteParameters>
        <InsertParameters>
            <asp:Parameter Name="Title" Type="String" />
            <asp:Parameter Name="Authorized" Type="Boolean" />
            <asp:Parameter Name="CreateDateTime" Type="DateTime" />
        </InsertParameters>
        <SelectParameters>
            <asp:ControlParameter ControlID="DropDownList1" Name="GenreId" 
                PropertyName="SelectedValue" Type="Int32" />
        </SelectParameters>
        <UpdateParameters>
            <asp:Parameter Name="Title" Type="String" />
            <asp:Parameter Name="Authorized" Type="Boolean" />
            <asp:Parameter Name="CreateDateTime" Type="DateTime" />
            <asp:Parameter Name="Id" Type="Int32" />
        </UpdateParameters>
    </asp:SqlDataSource>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:PlanetWroxConnectionString1 %>" 
        SelectCommand="SELECT [Id], [Name] FROM [Genre] ORDER BY [SortOrder]">
    </asp:SqlDataSource>
</asp:Content>
My gut feeling is that I am not passing the correct ID number. Any help would be appreciated.

Thanks
 
Old July 9th, 2010, 03:24 PM
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Default

Hi there,

Your reasoning is correct and you're indeed not passing the corrrect ID. To find and fix issues like this, take a look at the address of the update page in the browser. I think instead of seeing something lke AddEditReview.aspx?Id=123 you see AddEditReview.aspx?Id=(0), right?

That's because of this:

Code:
<asp:HyperLinkField DataNavigateUrlFields="Id" 
      DataNavigateUrlFormatString="AddEditReview.aspx?Id=(0)" DataTextField="Title" 
      HeaderText="Title" />
You're using parentheses (0) instead of curly braces {0} which is required to correctly pass the ID to the next page.

Hope this helps,

Imar
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Imar Spaanjaars
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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Old July 9th, 2010, 11:14 PM
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Default

That was it. Thank you for your help.




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