Change Background color of Repeater Item Row on Button click in ASP.Net

HTML:

    <form id="form1" runat="server">
    <div>
        <table id="tblQuestion_1">
            <thead>
                <tr>
                    <th>
                        Id
                    </th>
                    <th>
                        Name
                    </th>
                </tr>
            </thead>
            <tbody>
                <asp:Repeater ID="rptDemo" runat="server">
                    <ItemTemplate>
                        <tr runat="server" id="row">
                            <td>
                                <asp:Label ID="lblId" runat="server" Text='<%#Eval("Id") %>'></asp:Label>
                            </td>
                            <td>
                                <asp:Label ID="lblName" runat="server" Text='<%#Eval("Name") %>'></asp:Label>
                            </td>
                            <td>
                                <asp:Button ID="Button1" EnableViewState="false" OnClick="ChangeColor" Text="Click Me!"
                                    runat="server" />
                            </td>
                        </tr>
                    </ItemTemplate>
                </asp:Repeater>
            </tbody>
        </table>
    </div>
    </form>

C#:

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)), 
                            new DataColumn("Name", typeof(string)), 
                            new DataColumn("Country",typeof(string)) });
            dt.Rows.Add(1, "John Hammond", "United States");
            dt.Rows.Add(2, "Mudassar Khan", "India");
            dt.Rows.Add(3, "Suzanne Mathews", "France");
            dt.Rows.Add(4, "Robert Schidner", "Russia");
            rptDemo.DataSource = dt;
            rptDemo.DataBind();
        }
    }

    protected void ChangeColor(object sender, EventArgs e)
    {
        HtmlTableRow row = ((sender as Button).NamingContainer.FindControl("row") as HtmlTableRow);
        row.Attributes["style"] = "background-color:red";
    }