年份：

            <asp:Button ID="bnname" runat="server" Text="查询" OnClick="bnck\_click" />

      protected void bnck\_click(object sender, EventArgs e)  
    {  
        if (Convert.ToString(tbxProDate.Value) == "")  
        {

            lbtitle.Text = "请选择年份。";  
        }  
        FillUI();  
    }