How to use a DDL that is inside a template field of a Gridview

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C#

ASP.NET

I keep a DDL 'AmtddL' inside a template field of GV3. I want to select a value from this DDL and I use event handler 'OnSelectedIndexChanged' with this DDL. I already have this event handler with GV3. I get the error: 'No overload for 'ddlselectedindexchanged' matches delegate System.EventHandler'. I submit the codes.

protected void ddlselectedindexchanged(object sender,GridViewRowEventArgs e)  //district ddl
   {
       var ddlsample = (DropDownList)e.Row.FindControl("AmtddL");

       if (ddlsample.SelectedIndex == 0)
       {

       }
       else
       {

<asp:GridView ID="GridView3" runat="server" HorizontalAlign="Center"  AutoGenerateColumns="False"   OnRowDataBound="gvUserInfo_RowDataBound"
         style="border-color: #808000; top: 480px; left: 77px; position: absolute; height: 84px; font-size:small;
         width: 1100px" PageSize="5" AllowPaging="true"
         onselectedindexchanged="GridView3_SelectedIndexChanged">
         <Columns >
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="chkSelect5" runat="server"   />
</ItemTemplate>
</asp:TemplateField>
</Columns>

            <RowStyle HorizontalAlign="Center" />
            <Columns>


 <asp:TemplateField HeaderText="AmtddL">
<ItemTemplate>
<asp:DropDownList ID="AmtddL" runat="server" Width="84px" OnSelectedIndexChanged="ddlselectedindexchanged"/>
</ItemTemplate>
</asp:TemplateField>