Run time error on page_load

I am fetching the question in DetailView. but in Page_Load its giving the runtime error "the Input String is not in a proper format. the code is as below.:

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 <%@ Page Language="C#" Debug="true"%>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<script runat="server"> 
 
    protected void Page_Load(object sender, EventArgs e)

    {

        DetailsView1.DataBind();        
 
    }
 
    protected void Button1_Click(object sender, EventArgs e)

    {

        //Save off previous answers

        System.Data.DataRowView dr = (System.Data.DataRowView)DetailsView1.DataItem;
 
        // Create Answer object to save values

        Answer a = new Answer();

        a.QuestionID = dr["QuestionID"].ToString();

        a.CorrectAnswer = dr["CorrectAnswer"].ToString();

        a.UserAnswer = DropDownList1.SelectedValue.ToString();
 
        ArrayList al = (ArrayList)Session["AnswerList"];

        al.Add(a);
 
        Session.Add("AnswerList", al);

        if (DetailsView1.PageIndex == DetailsView1.PageCount - 1)

        {

            // Go to evaluate answers

            Response.Redirect("evaluate.aspx");

        }

        else

        {

            DetailsView1.PageIndex++;

            Button1.Text = "Finished";

        }       

    }
 
</script>

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<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title>Untitled Page</title>

</head>

<body>

    <form id="form1" runat="server">

    <div>    

        <br />

        <br />

        <br />

        <br />

        <br />

        <br />

        <br />

        <br />

&nbsp;

        <asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" 

            DataKeyNames="QuestionID" DataSourceID="SqlDataSource1" Height="50px" 

            style="margin-left: 222px" Width="539px" ondatabinding="Page_Load">

            <Fields>

                <asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />

                <asp:BoundField DataField="QuestionID" HeaderText="QuestionID" 

                    InsertVisible="False" ReadOnly="True" SortExpression="QuestionID" />

                <asp:BoundField DataField="Answer1" HeaderText="Answer1" 

                    SortExpression="Answer1" />

                <asp:BoundField DataField="Answer2" HeaderText="Answer2" 

                    SortExpression="Answer2" />

                <asp:BoundField DataField="Answer3" HeaderText="Answer3" 

                    SortExpression="Answer3" />

                <asp:BoundField DataField="Answer4" HeaderText="Answer4" 

                    SortExpression="Answer4" />

            </Fields>

        </asp:DetailsView>

&nbsp;

        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 

            ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 

            SelectCommand="SELECT [QuestionID], [Title], [Answer1], [Answer2], [Answer3], [Answer4], [CorrectAnswer] FROM [Question] WHERE ([QuizID] = @QuizID) ORDER BY [QuestionOrder]">

            <SelectParameters>

                <asp:Parameter DefaultValue="@QuizID" Name="QuizID" Type="Int32" />

            </SelectParameters>

        </asp:SqlDataSource>

        <br />

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

        <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

        <asp:DropDownList ID="DropDownList1" runat="server">

            <asp:ListItem Value="1">A1</asp:ListItem>

            <asp:ListItem Value="2">A2</asp:ListItem>

            <asp:ListItem Value="3">A3</asp:ListItem>

            <asp:ListItem Value="4">A4</asp:ListItem>

        </asp:DropDownList>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

 <asp:RadioButton ID="RadioButton1" runat="server" Style="z-index: 103; left: 69px;

            position: absolute; top: 157px" Text=" " />
 
    </div>

    </form>

</body>

</html>

Oct 11 '11 #1

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Run time error on page_load

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