ASP.NET C# - Enter Key

ASP.NET 2.0 makes this problems easier and introduce a concept of a "default button". New defaultbutton attribute can be used with <form> or <asp:panel> control. What button will be "clicked" depends of where acutally cursor is and what button is choosen as a default button for form or a panel.

Here is sample HTML code that contains one form and one panel control:

<form defaultbutton="button1" runat="server">
    <asp:textbox id="textbox1" runat="server"/>
    <asp:textbox id="textbox2" runat="server"/>
    <asp:button id="button1" text="Button1" runat="server"/>
    <asp:panel defaultbutton="button2" runat="server">
        <asp:textbox id="textbox3" runat="server"/>
        <asp:button id="button2" runat="server"/>
    </asp:panel>
</form>