我正在嘗試在單擊 asp web 表單中的提交按鈕時運行我的代碼。單擊按鈕后立即發生錯誤有人知道原因嗎？錯誤消息顯示如下：“/”應用程序中的服務器錯誤。此時無法啟動異步操作。異步操作只能在異步處理程序或模塊內或在頁面生命周期中的某些事件期間啟動。如果在執行 Page 時發生此異常，請確保將 Page 標記為 <%@ Page Async="true" %>。aspx文件：<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server"><div class="jumbotron">    <h1>Luis</h1>                <asp:TextBox ID="TextBox1" runat="server" Height="40px" Width="273px"></asp:TextBox>    </div>    <p>       <input id="Submit1"  runat="server" type="submit" value="Check" onserverclick="Submit_Click"/></p>      <p>    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label></p></asp:Content>.cs 文件：public partial class _Default : Page{public async void Submit1_Click(object sender, EventArgs e) {    string utterance = TextBox1.Text;    var client = new HttpClient();    var queryString = HttpUtility.ParseQueryString(string.Empty);    // This app ID is for a public sample app that recognizes requests to turn on and turn off lights    var luisAppId = "75bcaaff-1dc1-4dsa-adf7-63584cea339a";    var subscriptionKey = "43314f19c5ecgdascba6a00f1d3cc3533";    // The request header contains your subscription key    client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);    // The "q" parameter contains the utterance to send to LUIS    //queryString["q"] = "turn on the left light";    // These optional request parameters are set to their default values    queryString["timezoneOffset"] = "0";    queryString["verbose"] = "false";    queryString["spellCheck"] = "false";    queryString["staging"] = "false";    var uri = "https://westus.api.cognitive.microsoft.com/luis/v2.0/apps/" + luisAppId + "?" + queryString + "&q=" + utterance;    var response = await client.GetAsync(uri);    var strResponseContent = await response.Content.ReadAsStringAsync();    // Display the JSON result from LUIS    //Console.WriteLine(strResponseContent.ToString());    Label1.Text = strResponseContent.ToString();}}