Object reference not set to an instance of an object with listview databound

Question

I have a list view that loads with the page, but i want to hide a button with a condition.

I get this error message Object reference not set to an instance of an object.

Even thought the commandName has a value.The code is under the listview databound.

This my code:

protected void PostListView_ItemDataBound(object sender, ListViewItemEventArgs e)
    {

        if (e.Item == null)
            return;

        MembershipUser currentUser = Membership.GetUser();
        Guid currentUserId = (Guid)currentUser.ProviderUserKey;
        Button btn1 = (Button)e.Item.FindControl("deleteButton");

        if (currentUserId.ToString() == btn1.CommandName.ToString())
        {
            Button hdn = (Button)e.Item.FindControl("deleteButton");
            btn1.Visible = false;
        }

        else
        {
            Button hdn = (Button)e.Item.FindControl("deleteButton");
            btn1.Visible = false;
        }
    }



<asp:ListView ID="PostListView" runat="server" DataSourceID="POSTDataSource2" OnItemDataBound="PostListView_ItemDataBound" OnLoad="PostListView_Load">
                                <AlternatingItemTemplate>

                                    <p class="text-muted">
                                                    <asp:Button ID="deleteButton" runat="server" Text="Delete" CssClass="btn btn-info btn-xs pull-right" Width="50px" CommandName='<%# Eval("UserId") %>'  />
                                    </p>
                                </AlternatingItemTemplate>

@mason if (currentUserId.ToString() == btn1.CommandName.ToString()) — Musa, Jan 28 '15 at 17:11
@Musa Probably `btn1` is null, it can't be found. Post your markup for the ListView. — mason, Jan 28 '15 at 17:24
possible duplicate of [What is a NullReferenceException and how do I fix it?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) — JKennedy, Jan 28 '15 at 17:27
Your markup has ``, ``, and `` tags without matching start tags. Your button has an extra closing tag. — mason, Jan 28 '15 at 17:31
@Musa That's probably part of the problem. In order to locate the incorrect part, you should create a [Minimal, Complete, and Verifiable example](http://stackoverflow.com/help/mcve). — mason, Jan 28 '15 at 17:45

score 0 · Answer 1 · answered Jan 28 '15 at 17:08

You have to check the ItemType in ItemDataBound:

protected void PostListView_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (e.Item.ItemType == ListViewItemType.DataItem)
    {
        MembershipUser currentUser = Membership.GetUser();
        Guid currentUserId = (Guid)currentUser.ProviderUserKey;
        Button btn1 = (Button)e.Item.FindControl("deleteButton");

        if (currentUserId.ToString() == btn1.CommandName.ToString())
        {
            Button hdn = (Button)e.Item.FindControl("deleteButton");
            btn1.Visible = false;
        }

        else
        {
            Button hdn = (Button)e.Item.FindControl("deleteButton");
            btn1.Visible = false;
        }
    }
}

Object reference not set to an instance of an object with listview databound

1 Answers1