<asp:ScriptManager ID="ScriptManager1" runat="server">
	</asp:ScriptManager>
	<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
		<ContentTemplate>
			<asp:Label ID="label" runat="server" Text="Label"></asp:Label>
		</ContentTemplate>
	</asp:UpdatePanel>
	<asp:UpdatePanel ID="UpdatePanel2" UpdateMode="Conditional" runat="server">
		<ContentTemplate>
			<asp:GridView ID="grid" runat="server" AutoGenerateSelectButton="True" OnSelectedIndexChanging="grid_SelectedIndexChanging">
			</asp:GridView>
		</ContentTemplate>
	</asp:UpdatePanel>

protected void Page_Load(object sender, EventArgs e)
	{
		if (!Page.IsPostBack)
			this.BindGrid();

	}

	private void BindGrid()
	{
		this.grid.DataSource = new String[] { "A", "B", "C", "D" };
		this.grid.DataBind();
	}

	protected void grid_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
	{
		this.label.Text = grid.Rows[e.NewSelectedIndex].Cells[1].Text;
		this.UpdatePanel1.Update();
	}