.net:
<input id="hah" type="text" onkeyup="show()" />
<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" ></asp:TextBox>
<javascript>:
function show()
{
var x=document.getElementbyId("hah");
document.getElementbyId("TextBox1").value="<%=ggg()%>";
}