Setting the default Button for a TextBox in ASP.NET

JavaScript function

function clickButton(e, buttonid)

{

var evt = e ? e : window.event;

var bt = document.getElementById(buttonid);

if (bt)

{

if (evt.keyCode == 13)

{

bt.click();

return false;

}

}

}

Call on button

<asp:ImageButton ID="ImageButton1" runat="server" Height="50" Width="50" BorderWidth="1"

CssClass="btnimage" ImageUrl="" OnClick="ImageButton1_Click" />

<input name="TextBox1" type="text" id="TextBox1" onkeypress="return clickButton(event,'ImageButton1')"  />