Get the index of the clicked hyperlink in list view - asp.net

Question

The data is displayed from database as follows using list view.I have a hyperlink in list View on click of which i need to set session with the id or datakey of the clicked item row.how can i get it?
<asp:ListView ID="lstvwResultInquiry" runat="server" DataKeyNames="inquiry_id"
onitemdatabound="ListView1_ItemDataBound"
onpagepropertieschanging="PagePropertiesChanging"
onitemcanceling="CancelListViewItem" onitemediting="EditListViewItem"
onselectedindexchanging="lstvwResultInquiry_SelectedIndexChanging" >
<LayoutTemplate >
<div id="rightnowIn">
<table class="gridview"cellpadding="5" cellspacing="5" >
<tr class="header">
<th width="140">Company</th>
<th width="220">Event</th>
<th width="125">Country</th>
<th width="125">Date</th>
<th width="100">Details</th>
</tr>
<tr id="itemPlaceholder" runat="server" />
<tr id="Tr1" runat="server" align="center" >
<td colspan="2" align="left"><asp:Label ID="lblCount" runat="server"></asp:Label></td>
<td id="Td1" runat="server" style="" colspan="4">
<asp:DataPager class="mpart" ID="DataPager1" PageSize="15" runat="server" align="center">
<Fields>
<asp:NumericPagerField ButtonType="Link"ButtonCount="3" PreviousPageText="<<<" NextPageText=">>>" />
</Fields>
</asp:DataPager>
</td>
<td colspan="2" align="left"></td></tr></table>
</LayoutTemplate>
<ItemTemplate >
<tr class="itemTemplateTr" >
<td style="color: #403f3f; font-weight: bold;"><%# Eval("company")%></td>
<td><asp:Label ID="lblEvents" runat="server" ></asp:Label></td>
<td><%# Eval("country_name")%></td>
<td><%# Eval("date", "{0:dd-MM-yyyy}")%></td>
<% if (Session["session_log_id"] != null)
{ %>
<td class="command"><asp:HyperLink ID="btnEdit" runat="server" Text="View" commandName="view" cssclass="linkEditButton" Font-Underline="True"/</td
<%} %>
<td>
<asp:Button ID="buttReminder" runat="server" Visible="false" CssClass="reminderButton" CommandArgument='<%# Eval("inquiry_id")%>' OnClick="buttReminderInquiry_Click" BorderStyle="None" /></td> </tr>
</ItemTemplate>
<AlternatingItemTemplate>
<tr class="alternatingItem">
<td style="color: #403f3f; font-weight: bold;"><%# Eval("company")%></td>
<td><asp:Label ID="lblEvents" runat="server" ></asp:Label></td>
<td><%# Eval("country_name")%></td>
<td><%# Eval("date", "{0:dd-MM-yyyy}")%></td>
<% if (Session["session_log_id"] != null)
{ %>
<td class="command"><asp:HyperLink ID="btnEdit" runat="server" Text="View" cssclass="linkEditButton" Font-Underline="True" /></td>
<%} %>
<td>
<asp:Button ID="buttReminder" runat="server" Visible="false" CssClass="reminderButton" CommandArgument='<%# Eval("inquiry_id")%>' OnClick="buttReminderInquiry_Click" BorderStyle="None" /></td>
</tr></AlternatingItemTemplate>
<EmptyDataTemplate>
<div style="text-align:center;font-weight:bold">0 Results Founds</div>
</EmptyDataTemplate>
</asp:ListView>
Now I want to know the row index clicked on click of hyperlink.I want to set the session with the datakey on the selected row i.e clicked hyperlink.