how to work with enter key in asp.net in textbox

<div> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br /> <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br /> <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox> <asp:Button ID="Button1" runat="server" Text="Button" /> </div>
 
This my code.how should work the enter key and up&down keys please help me any one.
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