Change Border and Background color of Button when clicked in ASP.Net DataList

Please refer this code. Run this code in a new Page.

HTML

<asp:DataList ID="DataList1" runat="server">
    <ItemTemplate>
        <asp:Label Text='<%# Eval("Id") %>' runat="server" />
        &nbsp; &nbsp; &nbsp;
        <asp:Label ID="lblName" Text='<%# Eval("Name") %>' runat="server" />
        &nbsp; &nbsp; &nbsp;
        <asp:Label ID="lblCountry" Text='<%# Eval("Country") %>' runat="server" />
        &nbsp; &nbsp; &nbsp;
        <asp:Button ID="btnClick" Text="Click Me!" OnClick="Click" runat="server" />
    </ItemTemplate>
</asp:DataList>

Namespace

using System.Data;

 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");
        DataList1.DataSource = dt;
        DataList1.DataBind();
    }
}
protected void Click(object sender, EventArgs e)
{
    DataListItem currentItem = (sender as Button).NamingContainer as DataListItem;
    foreach (DataListItem item in DataList1.Items)
    {
        Button btn = item.FindControl("btnClick") as Button;
        btn.Attributes["style"] = "";
        if (currentItem.ItemIndex == item.ItemIndex)
        {
            btn.Attributes["style"] = "border: 1px solid red";
        }
    }
}