ASP.NET

<script type="text/javascript"><br />
function ButtonPress (evt, btnID) {<br />
if (evt.keyCode == "13") <br />
{evt.returnValue= false ; evt.cancel= true ; document.getElementById(btnID).click(); return false; }<br />
}<br />
</script><br />
<br />
In the codebhind add the following.<br />
Dim ObjButton as Button = UserControl.Findcontrol("ButtonId")<br />
<br />
Me.Textbox1.Attributes.Add("onKeyPress", "ButtonPress(event, '" & ObjButton.ClientID & "')")<br />
          <br />
<br />

<br />
Textbox txt = (Textbox) Usercontrol.FindControl("TextboxID");<br />
this.txt.Attributes.Add("onKeyPress", "ButtonPress(event, '" &<br />
this.Button.ClientID & "')");<br />