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<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="更新时间:"></asp:Label>
<asp:Label ID="Lable2" runat="server" Text="Label" ForeColor="Red"></asp:Label><br />
<br />
</ContentTemplate>
</asp:UpdatePanel>
</div>
<div>
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="Lable3" runat="server" Text="第二次更新:"></asp:Label>
<asp:Label ID="Lable4" runat="server" Text="Lable1" ForeColor="Yellow"></asp:Label><br />
<br />
</ContentTemplate>
</asp:UpdatePanel>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</div>
protected void Button1_Click(object sender, EventArgs e)
{
this.Lable2.Text = DateTime.Now.ToString();
this.UpdatePanel1.Update();
Thread.Sleep(2000);
this.Lable4.Text = "你好,时间更新结束";
this.UpdatePanel2.Update();
}