本文實例分析了ASP.NET2.0使用Enter Key作為默認提交的方法。，具體如下：

網頁開發中最煩人的事情之一就是為表單處理"Enter key" ,"Enter key"已經成為用戶提交表單的偏好。雖然我們為用戶提供了提交按鈕，但是最簡單也是最直接的方式仍然是：輸入文字，然后回車完成提交

ASP.NET 2.0中為此提供了很好的解決方法。只需要將"defaultbutton"屬性指定到想要引發事件的按鈕控件的ID上就可以了。

在表單級別和面板級別（<asp:panel> 標記）均可以指定"defaultbutton"。當表單和面板中同時指定了defaultbutton，則如果在面板中觸發了"Enter key",則執行面板中的

下面的實例代碼中有一個表單和4個面板，報單和面板中都有按鈕。情各位注意：在文本框中回車后會觸發哪些按鈕的事件

<form id="form1" runat="server" defaultbutton="btn1"><div><asp:TextBox ID="txt" runat="server"></asp:TextBox><asp:Button ID="Button5" runat="server" Text="Cancel" OnClick="Button5_Click" /><asp:Button ID="btn1" runat="server" Text="Submit" OnClick="btn1_Click" /><asp:Panel ID="pnl1" runat="server" defaultbutton="Button1"><asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><asp:Button ID="Button1" runat="server" Text="Button1" OnClick="Button1_Click" /></asp:Panel><asp:Panel ID="Panel1" runat="server" defaultbutton="Button2"><asp:TextBox ID="TextBox3" runat="server"></asp:TextBox><asp:TextBox ID="TextBox4" runat="server"></asp:TextBox><asp:Button ID="Button2" runat="server" Text="Button2" OnClick="Button2_Click" /></asp:Panel><asp:Panel ID="Panel2" runat="server" defaultbutton="Button3"><asp:TextBox ID="TextBox5" runat="server"></asp:TextBox><asp:TextBox ID="TextBox6" runat="server"></asp:TextBox><asp:Button ID="Button3" runat="server" Text="Button3" OnClick="Button3_Click" /></asp:Panel><asp:Panel ID="Panel3" runat="server" defaultbutton="Button4"><asp:TextBox ID="TextBox7" runat="server"></asp:TextBox><asp:TextBox ID="TextBox8" runat="server"></asp:TextBox><asp:Button ID="Button4" runat="server" Text="Button4" OnClick="Button4_Click" /></asp:Panel></div></form>//The corresponding, sample events for the button clicks areprotected void Button1_Click(object sender, EventArgs e){Response.Write(Button1.Text);}protected void Button2_Click(object sender, EventArgs e){Response.Write(Button2.Text);}protected void Button3_Click(object sender, EventArgs e){Response.Write(Button3.Text);}protected void Button4_Click(object sender, EventArgs e){Response.Write(Button4.Text);}protected void btn1_Click(object sender, EventArgs e){Response.Write(btn1.Text);}protected void Button5_Click(object sender, EventArgs e){Response.Write(Button5.Text);}