Pop Up Control Extender + Web service call failed:12030/ 500

Hi , i encounter this in using Pop Up Control Extender inside a gridview.My coding is as below
coding in aspx

Code:

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<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4"
            DataKeyNames="empcode" ForeColor="#333333" GridLines="None">
            <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
            <Columns>
                <asp:BoundField DataField="empcode" HeaderText="empcode" ReadOnly="True" SortExpression="Name" />
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:Image ID="Image1" runat="server" ImageUrl="~/Image/magglass.jpg" />&nbsp;
                        <cc1:popupcontrolextender
                        ID="PopupControlExtender1"
                            runat="server"
                            DynamicServiceMethod="GetDynamicContent"
                            DynamicContextKey='<&#37;# Eval("empcode") %>'
                            DynamicControlID="Panel1"
                            TargetControlID="Image1"
                            PopupControlID="Panel1"
                            Position="Right"
                            >
                        </cc1:popupcontrolextender>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="empname" HeaderText="empname" SortExpression="Title" />
                <asp:BoundField DataField="telno" HeaderText="telno" SortExpression="Address" />
            </Columns>
            <RowStyle BackColor="#EFF3FB" />
            <EditRowStyle BackColor="#2461BF" />
            <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
            <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
            <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
            <AlternatingRowStyle BackColor="White" />
        </asp:GridView>
        <asp:Panel ID="Panel1" runat="server">
        </asp:Panel>

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vb coding is as below:

Code:

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Private Sub populateGridView()
        Dim str As String
        Dim ds As New DataSet

        dbconn.Conn.Open()

        str = "select empcode,empname,telno from employee limit 5 "

        ds = dbconn.SelectQuery(str, dbconn.Conn)
        Me.GridView1.DataSource = ds
        GridView1.DataBind()

    End Sub

Protected Sub GridView1_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowCreated
        If e.Row.RowType = DataControlRowType.DataRow Then

            Dim pce As PopupControlExtender
            Dim behaviorID As String
            Dim i As Image
            Dim OnMouseOverScript As String
            Dim OnMouseOutScript As String


            pce = e.Row.FindControl("PopupControlExtender1")

            behaviorID = String.Concat("pce", e.Row.RowIndex)
            pce.BehaviorID = behaviorID

            i = e.Row.Cells(1).FindControl("Image1")

            OnMouseOverScript = String.Format("$find('{0}').showPopup();", behaviorID)
            OnMouseOutScript = String.Format("$find('{0}').hidePopup();", behaviorID)

            i.Attributes.Add("onmouseover", OnMouseOverScript)
            i.Attributes.Add("onmouseout", OnMouseOutScript)
        End If

    End Sub
<System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()> _
    Public Function GetDynamicContent(ByVal contextKey As String) As String

        Dim sTemp = New StringBuilder()


        sTemp.Append("<table>")
        sTemp.Append("<tr><td><b>Territories:</b></td></tr>")

        sTemp.Append("<tr><td>" + "zxczc" + "</td></tr>")

        sTemp.Append("</table>")

        Return sTemp.ToString()
    End Function

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Does anyone has idea on this, i have try few ways like adding a web services call myWebServices.asmx where it's location is same as the web pages and having DynamicServicePath="CourtService.asmx" in pop up control extender. But it still bring me to the same error.

You need not create a web service, simply copy the given code in the .aspx.cs file and try to debug the function using the asp.net debugger Or it could be the problem with the query you have entered.