<script runat="server" language="C#" > protected void MySubmitHandler(object o, EventArgs e) { inputText.Value = "GoodBye"; } </script> <html> <form runat="server"> <input id="inputText" type="text" runat="server" value="Hello" /> <input type="submit" runat="server" value="Go" onServerClick="MySubmitHandler"/> </form> </html>