My Code is given Below:

 <asp:GridView ID="gvTask" runat="server" Width="100%" GridLines="Both" AutoGenerateColumns="false"
                        AllowPaging="true" PageSize="30" DataKeyNames="TId" OnPageIndexChanging="gvTask_PageIndexChanging">
                        <Columns>
                            <asp:TemplateField HeaderText="Project Title" ItemStyle-CssClass="cssItemStyle" HeaderStyle-CssClass="cssItemStyle">
                                <ItemTemplate>
                                    <asp:Label ID="lblPTitle" runat="server" Text='<%#Eval("PTitle")%>'></asp:Label>
                                </ItemTemplate>
                                <ItemStyle Width="20%" Height="30px" HorizontalAlign="left" />
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="Task Title" ItemStyle-CssClass="cssItemStyle" HeaderStyle-CssClass="cssItemStyle">
                                <ItemTemplate>
                                    <asp:Label ID="lblTTitle" runat="server" Text='<%#Eval("TName")%>'></asp:Label>
                                </ItemTemplate>
                                <ItemStyle Width="25%" Height="30px" HorizontalAlign="left" />
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="Department" ItemStyle-CssClass="cssItemStyle" HeaderStyle-CssClass="cssItemStyle">
                                <ItemTemplate>
                                    <asp:Label ID="lblDepartment" runat="server" Text='<%#Eval("DeptName")%>'></asp:Label>
                                </ItemTemplate>
                                <ItemStyle Width="15%" Height="30px" HorizontalAlign="left" />
                            </asp:TemplateField>
                            <asp:TemplateField HeaderText="View" ItemStyle-CssClass="cssItemStyle" HeaderStyle-CssClass="cssItemStyle">
                                <ItemTemplate>
                                    <a href='AdmCreateTask.aspx?id=<%#Eval("TId")%>' style="text-decoration: none">
                                        <asp:ImageButton ID="imgView" runat="server" ImageUrl="images/view.png" Width="30"
                                            Height="30" AlternateText="" />
                                    </a>
                                </ItemTemplate>
                                <ItemStyle Width="1%" Height="30px" />
                            </asp:TemplateField>
                        </Columns>
                    </asp:GridView>

<asp:ModalPopupExtender ID="ModalPopupExtender1" PopupControlID="Panl1" TargetControlID="imgView" CancelControlID="btnClose" BackgroundCssClass="Background" runat="server"> </asp:ModalPopupExtender>

I want to assign the Id of ImageButton inside a GridView in TargetControlID of ModelPoppupExtender. How I will do it? Please suggest me.