Usercontrol with ajax update panel causes null reference exception.

Discussion in 'ASP .Net' started by Wayne Brantley, Mar 14, 2007.

  1. Wayne Brantley, Mar 14, 2007
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  2. Hi Wayne,

    I cannot seem to reproduce the issue you mentioned on forum. I've
    created following simple WebUserControl and it's working fine on a WebForm:

    <%@ Control Language="C#" ClassName="WebUserControl" %>

    <script runat="server">

    protected void Button1_Click(object sender, EventArgs e)
    // Label1.Text = DateTime.Now.ToString();
    LabelText = DateTime.Now.ToString();

    public string LabelText
    get { return Label1.Text; }
    set { Label1.Text = value; }


    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click"
    Text="Button" />

    Please note that I'm not adding a ScriptManager onto the UserControl since
    only one ScriptManager instance can exist on a WebForm; therefore the
    ScriptManager will always be added to the WebForm.

    I've also tried to use a MasterPage and still not able to reproduce it.

    Would you please post a complete code listing that could reproduce the
    issue? Thanks.

    Walter Wang (, remove 'online.')
    Microsoft Online Community Support

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    Walter Wang [MSFT], Mar 14, 2007
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  3. Hi Wayne,

    Since a web page can contain only one ScriptManager control (either
    directly on the page itself or indirectly inside a nested or parent
    component), you can use ScriptManagerProxy
    when you're using UpdatePanel on a content page or a web user control.

    Walter Wang (, remove 'online.')
    Microsoft Online Community Support

    When responding to posts, please "Reply to Group" via your newsreader so
    that others may learn and benefit from your issue.

    This posting is provided "AS IS" with no warranties, and confers no rights.
    Walter Wang [MSFT], Mar 16, 2007
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