Default button issue in c# asp.net

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C

ASP.NET

Hi All,
Please see the following code.

<form id="form1" runat="server" defaultbutton="NextButton" defaultfocus="TextBox1">
    <div>
        <asp:Panel ID="Panel1" runat="server">
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            <br />
            <br />
            <br />
            <br />
            <br />
            <br />
            <asp:Button ID="BackButton" runat="server" Text="Back" OnClick="Back_Click" />
            <asp:Button ID="NextButton" runat="server" Text="Next" OnClick="Next_Click" />
        </asp:Panel>
    </div>
    </form>

The problem is, setting focus to back button and pressing enter key will fire the Next button event. How to avoid this?

Please help me.

Thanks in Advance.