Well, the problem is the repeater might have 1 or 15 "sets"

So, you can do it like this:

        <asp:Repeater ID="Repeater1" runat="server">
            <ItemTemplate>
                <asp:Label ID="lblHotel" runat="server" 
                    width="200px"
                    Text='<%# Eval("HotelName") %>' >
                </asp:Label>

                <asp:Button ID="Button1" runat="server" Text="Row click (client side)"
                    OnClientClick='<%# "myrowfun(" + Container.ItemIndex.ToString + ");return false;" %>'
                    
                    />

                <br />
            </ItemTemplate>
        </asp:Repeater>

        <script>
            function myrowfun(ix) {
                alert("row click index = " + ix)
                lblID = "Repeater1_lblHotel_" + ix
                alert(lblID)
                // jQuery
                alert("Hotel name from repeater = " + $('#' + lblID).text())
                // javascript without jQuery
                MyLabel = document.getElementById(lblID)
                alert("Hotel = " +  MyLabel.innerText)
            }
        </script>

So, in above, we might fill the repeater like this:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not IsPostBack Then
        LoadGrid()
    End If
End Sub

Sub LoadGrid()

    Using con As New SqlConnection(My.Settings.TEST3)
        Using cmdSQL =
            New SqlCommand("SELECT TOP 5 ID, FirstName, LastName, HotelName from tblHotels ORDER BY HotelName", con)

            con.Open()
            Repeater1.DataSource = cmdSQL.ExecuteReader
            Repeater1.DataBind()

        End Using
    End Using

End Sub

And then we now have this:

When we click on the row click, it calls the js, and gets the one hotel value.

eg:

so, even if you have only 1 set in the repeater, it will start at 0 for the index, and each label will have a name of

"repeater name" + "_" + "label name" + "_" + row index