HELP! Listview not working with edit button ASP.NET

[DJOuk]

Posted this on Asp.Net, seems to be a hard problem, I still can't work it out

I have a edit button, this works fine, until I add the code that prevents the edit button from being seen by users who did not post that ticket. I cannot understand why this is happening. I get an error on the button says 'object reference not set in instance of object'



It happens when I add the following code:

protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
    {
        HiddenField commentidfield = e.Item.FindControl("commentidfield") as HiddenField;
        HiddenField userloginfield = e.Item.FindControl("userloginfield") as HiddenField;
 
        ImageButton votebutton = e.Item.FindControl("commentvotebutton") as ImageButton;
        ImageButton editbutton = e.Item.FindControl("editbutton") as ImageButton;
 
 
 
        if (HttpContext.Current.User.Identity.IsAuthenticated == true)
        {
            int commentidtemp = Convert.ToInt32(commentidfield.Value);
            int userloginid = Convert.ToInt32(userloginfield.Value);
 
            int commentcheck = Convert.ToInt32(commentratingclass.CheckCommentVote(Profile.userid, commentidtemp).GetValueOrDefault(0));
            int editcheck = Convert.ToInt32(commentclass.checkcommentbyuserid(Profile.userid, commentidtemp).GetValueOrDefault(0));
 
 
            if (userloginid == Profile.userid)
            {
                votebutton.Visible = false;
            }
            else if (commentcheck > 0)
            {
                votebutton.ImageUrl = "Images/commentvoted.png";
                votebutton.Enabled = false;
            }
            else
            {
                votebutton.ImageUrl = "Images/commentvote.png";
                votebutton.Enabled = true;
            }
 
            if (editcheck == 0)
            {
                editbutton.Visible = false;
            }
            else
            {
                editbutton.Visible = true;
            }
        }
        else
        {
            votebutton.Visible = false;
            editbutton.Visible = false;
        }
 
 
    }
 
 
 

Listview:

 
1    <asp:ListView ID="ListView1" runat="server" DataKeyNames="CommentID" DataSourceID="SqlDataSource1"
2                    OnItemDataBound="ListView1_ItemDataBound" 
3                    onitemupdating="ListView1_ItemUpdating">
4                    <LayoutTemplate>
5                        <table runat="server">
6                            <tr runat="server">
7                                <td runat="server">
8                                    <table id="itemPlaceholderContainer" runat="server" border="0" style="">
9                                        <tr id="itemPlaceholder" runat="server">
10                                       </tr>
11                                   </table>
12                               </td>
13                           </tr>
14                           <tr runat="server">
15                               <td runat="server" style="">
16                                   <center>
17                                       <asp:DataPager ID="DataPager1" runat="server">
18                                           <Fields>
19                                               <asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True" ShowNextPageButton="False"
20                                                   ShowPreviousPageButton="False" />
21                                               <asp:NumericPagerField />
22                                               <asp:NextPreviousPagerField ButtonType="Button" ShowLastPageButton="True" ShowNextPageButton="False"
23                                                   ShowPreviousPageButton="False" />
24                                           </Fields>
25                                       </asp:DataPager>
26                                   </center>
27                               </td>
28                           </tr>
29                       </table>
30                   </LayoutTemplate>
31                   <EmptyDataTemplate>
32                       <table runat="server" style="">
33                           <tr>
34                               <td>
35                                   No Answers! Add one Now!
36                               </td>
37                           </tr>
38                       </table>
39                   </EmptyDataTemplate>
40                   <EditItemTemplate>
41                    <table class="comments">
42                           <tr>
43                               <td class="commentsheader" rowspan="2">
44                                   <asp:Label ID="UserIDLabel" runat="server" Text='<%# Eval("Login") %>' />
45                                   answered:
46                                   <div id="details">
47                                       <br />
48                                       Rating:
49                                       <asp:Label ID="Usersratinglabel" runat="server" Text='<%#  Eval("Rating") %>' />
50                                       <br />
51                                       Posts:
52                                         <asp:Label ID="Usersanswers" runat="server" Text='<%#  Eval("Answers") %>' />
53                                       <asp:HiddenField ID="commentidfield" runat="server" Value='<%# Eval("CommentID") %>' />
54                                       <asp:HiddenField ID="userloginfield" runat="server" Value='<%# Eval("UserID") %>' />
55                               </td>
56                               <td class="commentsmain">
57                                   <asp:TextBox ID="updatetext" runat="server" Text='<%# Bind("Comment") %>' TextMode="MultiLine"
58                                       Width="500px" Height="150px" />
59                               </td>
60                           </tr>
61                           <tr>
62                               <td class="commentfooter">
63                                   <div class="commentfooter">
64                                       <asp:Button ID="updatebutton" runat="server" Text="Update"  CommandName="Update" />
65                                       <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Cancel" />
66                               </td>
67                           </tr>
68                           </td> </tr>
69                       </table>
70                   </EditItemTemplate>
71                   <ItemTemplate>
72                       <table class="comments">
73                           <tr>
74                               <td class="commentsheader" rowspan="2">
75                                   <asp:Label ID="UserIDLabel" runat="server" Text='<%# Eval("Login") %>' />
76                                   answered:
77                                   <div id="details">
78                                       <br />
79                                       Rating:
80                                       <asp:Label ID="Usersratinglabel" runat="server" Text='<%#  Eval("Rating") %>' />
81                                       <br />
82                                       Posts:
83                                       <asp:Label ID="Usersanswers" runat="server" Text='<%#  Eval("Answers") %>' />
84                                       <asp:HiddenField ID="commentidfield" runat="server" Value='<%# Eval("CommentID") %>' />
85                                       <asp:HiddenField ID="userloginfield" runat="server" Value='<%# Eval("UserID") %>' />
86                               </td>
87                               <td class="commentsmain">
88                                   <asp:Label ID="CommentLabel" runat="server" Text='<%# Eval("Comment") %>' />
89                               </td>
90                           </tr>
91                           <tr>
92                               <td class="commentfooter">
93                                   <asp:ImageButton ID="editbutton" CommandName="Edit" runat="server" ImageUrl="Images/commentedit.png" />
94                                   <asp:ImageButton ID="commentvotebutton" runat="server" OnCommand="commentvote_Click" ImageUrl="Images/commentvote.png"
95                                       CommandArgument='<%# Eval("CommentID") %>' CommandName="commentvote" />
96                               </td>
97                           </tr>
98                           </td> </tr>
99                       </table>
100                  </ItemTemplate>
101              </asp:ListView>