Press Enter to trigger Button Click event

You need to add some javascript to handle this.

Try this code.
function doSearch(buttonName)
{
var bool;
if(event.keyCode == 13)
bool = true;
if(bool == true)
{
document.getElementById(buttonName).click();
return false;
}
}

Then add the following code to the onkeypress event to your textbox.
"return doSearch('btnGo')"
replace btnGo with the name of your button