__doPostBack Not Working

Hi Experts,
    I have a problem Im hoping someone here can help me out here with. I am trying to use an imageButton to call the click event of a link button by doing a forced postback. This should be a simple task, but I have had no luck with this, and am stuck. The code for both the aspx file including the javascript function and the codebehind for the LinkButton_Click event is also posted. Any help to solve this would be appreciated. Thanks in Advance


ASPX
 
 <script type="text/javascript">
    function FillText()
    {
    //debugger;
      __doPostBack('<%= LinkButton1.UniqueID %>', ''); 
     //__doPostBack("LinkButton1","");
    
    }
    </script>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="False" UpdateMode="Conditional">
            <Triggers>
            <asp:AsyncPostBackTrigger ControlID="LinkButton1" EventName="Click" />
            </Triggers>
            <ContentTemplate>
                <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click" CausesValidation="false">LinkButton</asp:LinkButton>
                <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="true"></asp:TextBox>
                <br />
                <br />
                <div onclick='FillText()'>
                    <asp:ImageButton ID="ImageButton1" runat="server" />
                </div>
            </ContentTemplate>
        </asp:UpdatePanel>
 
C#
 
 protected void LinkButton1_Click(object sender, EventArgs e)
    {
        TextBox1.Text = "Hello There";
        UpdatePanel1.Update();
    }

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groovbox303Asked:
Who is Participating?
 
David H.H.LeeConnect With a Mentor Commented:
Hi groovbox303,
You can trigger the same function in UpdatePanel without javascript.
eg:
  <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="False" UpdateMode="Conditional">
            <Triggers>
            <asp:AsyncPostBackTrigger ControlID="LinkButton1" EventName="Click" />
            <asp:AsyncPostBackTrigger ControlID="ImageButton1" EventName="Click" />
            </Triggers>
            <ContentTemplate>
                <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click" CausesValidation="false">LinkButton</asp:LinkButton>
                <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="true"></asp:TextBox>
                <br />
                <br />
                <asp:ImageButton ID="ImageButton1" runat="server" OnClick="ImageButton1_Click" CausesValidation="false"/>
            </ContentTemplate>
        </asp:UpdatePanel>
 

private void ImageButton1_Click(object sender, System.Web.UI.ImageClickEventArgs e)
    {
        LinkButton1_Click(nothing,nothing);
    }

 protected void LinkButton1_Click(object sender, EventArgs e)
    {
        TextBox1.Text = "Hello There";
        UpdatePanel1.Update();
    }
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