在用戶控件重置Textbox.Text

Question

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ChatUserControl.ascx.cs" 
    Inherits="MetamorphismApp.ChatUserControl" %> 

<asp:Timer ID="timer1" runat="server" OnTick="timer1_Tick" Interval="5000"> 
</asp:Timer> 
<div id="divChatWindow" class="clChatWindow"> 
    <div> 
     <asp:Label runat="server" Text='<%# Eval("username") %>' class="divHeader" ID="lblChatFriend"></asp:Label> 
     <asp:Image ID="imgFriend" runat="server" CssClass="classFriendImage" /> 
     <asp:LinkButton ID="lbClose" runat="server" CommandName="Close" CssClass="lbClose" 
      OnClick="lbClose_Click">Close</asp:LinkButton></div> 
    <div class="chatText" id="idChatText" runat="server"> 
     <asp:UpdatePanel ID="UpdatePanel" runat="server"> 
      <Triggers> 
       <asp:AsyncPostBackTrigger ControlID="timer1" EventName="Tick" /> 
       <asp:AsyncPostBackTrigger ControlID="btnSendChat" EventName="Click" /> 
      </Triggers> 
      <ContentTemplate> 
       <asp:Repeater runat="server" ID="rpChatMessages"> 
        <ItemTemplate> 
         <asp:Image ID="imageForFriend" runat="server" CssClass="clFriendsImage" ImageUrl='<%# "HttpImageHandler.jpg?username=" + DataBinder.Eval(Container.DataItem,"fromusername").ToString() %>' /> 
         <asp:Label ID="chatMessage" runat="server" Text='<%# Eval("Message") %>'></asp:Label> 
         <br> 
        </ItemTemplate> 
       </asp:Repeater> 
      </ContentTemplate> 
     </asp:UpdatePanel> 
    </div> 
    <asp:TextBox ID="txtChatMessage" runat="server" Width="142px" CssClass="clChatMessage" EnableViewState="true" 
     TextMode="MultiLine"></asp:TextBox> 
    <asp:LinkButton ID="btnSendChat" runat="server" CommandName="Insert" CommandArgument='<%# Eval("username") %>' 
     OnClick="btnSendChat_Click">Send</asp:LinkButton> 

</div> 


protected void btnSendChat_Click(object sender, EventArgs e) 
     {    
      string username = lblChatFriend.Text; 
      ucc.InsertMessage(Session["username"].ToString(), username, txtChatMessage.Text); 
      txtChatMessage.Text = ""; 
     } 

時btnSendChat_Click事件處理函數txtChatMessage不會成爲空白

Answer 1

試試這個：

txtChatMessage.Text = string.Empty; 

，以確保該文本爲null或空