Access control id in gridview

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ASP.NET

C#3.5

I have a gridview.In gridview header row I have one link button and combo box.I am selecting one value in combobox and performing events.My problem is that I want to get linkbutton control id when I perform event in combobox.There are one combobox and link button in each template field inside header row.So I want closest link button id.is it possible to do using C# code

What I have tried:

 <asp:GridView ID="GridViewemp" runat="server" AllowPaging="True" class="gv"
            AllowSorting="True" onpageindexchanging="GridViewemp_PageIndexChanging" 
            BorderColor="#3399FF" BorderStyle="Groove" 
            CellPadding="1" CellSpacing="1"
            onsorting="GridViewemp_Sorting" PageSize="5" AutoGenerateColumns="False" 
            Height="10px" onselectedindexchanged="GridViewemp_SelectedIndexChanged" 
            onrowdatabound="GridViewemp_RowDataBound">
            <Columns>
             <asp:TemplateField HeaderText="E_Id ●" ControlStyle-Font-Names="Arial" SortExpression="eid" >
              <HeaderTemplate>
        <asp:LinkButton ID="linkid" runat="server" Text="E_Id ●" 
        CommandName="Sort" CommandArgument="eid"
        CssClass="RightAlign" ForeColor="Black"></asp:LinkButton>
      <br />
     <table>
      <tr>
       <td>
        <cc1:ComboBox ID="ComboBoid" runat="server" AutoCompleteMode="SuggestAppend" DropDownStyle="Simple" 
          Width="50px" AutoPostBack="true" OnSelectedIndexChanged="filter" >
              </cc1:ComboBox>
      </td>
</tr>
</table></HeaderTemplate>
            <ItemTemplate>
           <asp:Label ID="lblid" runat="server" Text='<%#Eval("eid")%>'/>
           </ItemTemplate>
<ControlStyle Font-Names="Arial"></ControlStyle>
          </asp:TemplateField>
          <asp:TemplateField HeaderText="E_Name ●" SortExpression="ename" ShowHeader="true" >
           <HeaderTemplate>
        <asp:LinkButton ID="linkname" runat="server" Text="E_Name ●" 
        CommandName="Sort" CommandArgument="ename"
        CssClass="RightAlign" ForeColor="Black"></asp:LinkButton>
      <br />
     <table>
      <tr>
       <td>
        <cc1:ComboBox ID="ComboBoxname" runat="server" AutoCompleteMode="SuggestAppend" DropDownStyle="Simple" 
          Width="50px" OnSelectedIndexChanged="filter" AutoPostBack="true" >
              </cc1:ComboBox>
      </td>
</tr>
</table></HeaderTemplate>
            <ItemTemplate>
           <asp:Label ID="lblname" runat="server" Text='<%#Eval("ename")%>' />
           </ItemTemplate>
          </asp:TemplateField>
</Columns>
            <HeaderStyle Font-Names="Times New Roman" Font-Size="Small" 
                ForeColor="Black" CssClass="header" Wrap="False" />
        </asp:GridView>