FindControl not working in Listview Null exception - asp.net

Question

protected void PassSessionVariable_Click(object sender, EventArgs e)
{
String strLocationID = livTour.FindControl("lblLocationID").ToString();
}
For some reason, the FindControl is getting a null exception. Any particular reasons?
Here is the code for my Listview. The find control is not finding the LocationID label.
<%--Create datasource for ListView for Tour Locations.--%>
<asp:SqlDataSource runat="server" ID="sdsListViewTour"
ConnectionString="<%$ConnectionStrings:2020LJCDT %>"
OldValuesParameterFormatString="original_{0}"
SelectCommand="SELECT LocationID, Location, Image
FROM Location
Order BY City;">
</asp:SqlDataSource>
<%--Listview--%>
<asp:ListView runat="server" ID="livTour"
DataKeyNames="Location"
DataSourceID="sdsListViewTour">
<ItemTemplate>
<div class="container p-1 bg-light">
<asp:LinkButton runat="server" ID="PassSessionVariable" OnClick="PassSessionVariable_Click">
<div class="row border-top border-bottom border-secondary" style="padding-top: 5px; padding-bottom: 5px; padding-left: 20px;">
<asp:Label runat="server" ID="lblLocationID" Text='<%# Eval("LocationID") %>' />
<div class="col text-center" style="margin: auto; color: #2699FB;">
<asp:Label runat="server" CssClass="font-weight-bold" Text='<%# Eval("Location") %>' />
</div>
<div class="col text-center">
<asp:Image runat="server" CssClass="rounded" ImageUrl='<%# "~/Image/Location/" + Eval("Image") %>' />
</div>
</div>
</asp:LinkButton>
</div>
</ItemTemplate>
</asp:ListView>

Answer 1

You can find location label via BindingContainer of sender as follow:
protected void PassSessionVariable_Click(object sender, EventArgs e)
{
var locationLabel = (((Control)sender).BindingContainer.FindControl("lblLocationID") as Label);
String strLocationID = locationLabel.Text;
}
In this case BindingContainer indicates the row of ListItem that you click. So that you can find location label in this row.