problem is related to imagebutton in the gridview thats command event is not working..

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ASP.NET

i m using image button in gridview for deletion and updation.
but its command event is not working...tell me plz for this i m using this code

<asp:GridView ID="gv_allcontact" runat="server" AutoGenerateColumns="False" OnSelectedIndexChanged="gv_appt_SelectedIndexChanged"
                                        Width="813px">
                                        <Columns>
                                            <asp:BoundField DataField="contact_calling_data" HeaderText="Calling Date" />
                                            <asp:BoundField DataField="contact_name" HeaderText="Name" />
                                            <asp:BoundField DataField="contact_company" HeaderText="Company Name" />
                                            <asp:BoundField DataField="contact_mobile1" HeaderText="Mobile Number" />
                                            <asp:BoundField DataField="contact_email" HeaderText="Email-Id" />
                                            <asp:BoundField DataField="contact_service_type" HeaderText="Service Type" />
                                            <asp:BoundField DataField="emp_name" HeaderText="Added By" />
                                            <asp:BoundField DataField="contact_clngstatus" HeaderText="Current Status" />
                                            <asp:TemplateField HeaderText="Status">
                                                <ItemTemplate>
                                                    <asp:LinkButton ID="lbtn_allstatus" runat="server" CommandArgument='<%# Bind("contact_id") %>'
                                                        OnCommand="lbtn_allstatus_Command1">Status</asp:LinkButton>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:TemplateField HeaderText="Email">
                                                <ItemTemplate>
                                                    <asp:LinkButton ID="lbtn_allemail" runat="server" OnCommand="lbtn_allemail_Command1"
                                                        CommandArgument='<%# Bind("contact_id") %>'>Email</asp:LinkButton>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:TemplateField HeaderText="View">
                                                <ItemTemplate>
                                                    <asp:LinkButton ID="lbtn_view_all" runat="server" CommandArgument='<%# Bind("contact_id") %>'
                                                        OnCommand="lbtn_view_all_Command">View</asp:LinkButton>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:TemplateField HeaderText="Edit">
                                                <ItemTemplate>
                                                    <asp:ImageButton ID="lbtn_editall" runat="server" CommandArgument='<%# Bind("contact_id") %>'
                                                        OnCommand="lbtn_editall_Command1" ImageUrl="~/images/imagesedit.jpg" />
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:TemplateField HeaderText="Delete">
                                                <ItemTemplate>
                                                    <asp:ImageButton ID="lbtn_delall" runat="server" CausesValidation="False" CommandArgument='<%# Bind("contact_id") %>'
                                                        OnClientClick="return confirm('Do you want to delete this record')"
                                                        OnCommand="lbtn_delall_Command1" ImageUrl="~/images/delete iamge.jpg" />
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                        </Columns>
                                    </asp:GridView>

and the code on code behind is as follows:->

protected void lbtn_editall_Command1(object sender, CommandEventArgs e)
   {
       object id = e.CommandArgument;
       id1 = Convert.ToInt32(id);
       getpermissionCode();
       if (Session["username"].ToString() == code)
       {
           Response.Redirect("EditContact.aspx?id=" + id);
       }
       else if (Session["type"].ToString() == "CA" || Session["type"].ToString() == "BA")
       {
           Response.Redirect("EditContact.aspx?id=" + id);
       }
       else
       {
           ScriptManager.RegisterStartupScript(this, this.GetType(), "Success", "<script>alert('You Do Not Have Permissions To Edit This');</script>", false);
       }
   }