[سؤال] الزرار LinkButton لا ينفذ الاومر عند الضغط عليه

السلام عليكم شباب

قومة باضافة LinkButton و ربط بقاعدة البيانات و لكن ظهر مشكلة و هى
عن الضغط على LinkButton المفروض ان يعرض البيانات عن طريق استعلام و لكن لا يفعل شى ما الحل مشكلة غريبة Big Grin

و هذى الكود الخاصة ب LinkButton
كود vb.net

كود :

Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString)

        If ConnectionState.Open Then con.Close()

        Dim str As String = "SELECT * from Sub_List WHERE (Sub_List=N'" + LinkButton1.Text + "')"

        Dim cmd As SqlCommand = New SqlCommand(str, con)

        If Not IsPostBack Then

            cmd.Connection = con

            Label1.Text = ""

            Label2.Text = ""

            Label3.Text = ""

            Image4.ImageUrl = ""

            con.Open()

            Dim drr As SqlDataReader = cmd.ExecuteReader()

            While (drr.Read())

                Label1.Text = drr("Sub_List")

                Label2.Text = drr("subject")

                Label3.Text = drr("Notes")

                Image4.ImageUrl = "~/img/" + drr("img")

            End While

        End If

        If ConnectionState.Open Then con.Close()

كود aspx

كود :

<asp:UpdatePanel ID="UpdatePanel1" runat="server">

            <ContentTemplate>

                <br />

                <asp:LinkButton ID="LinkButton1" runat="server" Font-Bold="True" 

                    Font-Italic="False" Font-Overline="False" Font-Strikeout="False" 

                    Font-Underline="False" style="color: #FFFFFF">LinkButton</asp:LinkButton>

                <br />

                <br />

                <asp:Timer ID="Timer1" runat="server" Interval="8888">

                </asp:Timer>

                <asp:Image ID="Image2" runat="server" Height="130px" Width="143px" />

                <br />

                <br />

                <asp:LinkButton ID="LinkButton2" runat="server" Font-Bold="True" 

                    Font-Strikeout="False" Font-Underline="False" style="color: #FFFFFF">LinkButton</asp:LinkButton>

                <br />

                <br />

                <asp:Image ID="Image3" runat="server" Height="130px" Width="143px" />

            </ContentTemplate>

            <Triggers>

                <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />

                <asp:AsyncPostBackTrigger ControlID="LinkButton1" EventName="Click" />

                <asp:AsyncPostBackTrigger ControlID="LinkButton2" EventName="Click" />

            </Triggers>

        </asp:UpdatePanel>