How to call a function on keypress event...?

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ASP.NET

C#3.5

Is it possible to call a c# function inside asp text box's key press event, with out declaring it as a web-method.

if it is possible then please give me some suggestion to do it..

<asp:TextBox ID="txtSearch" runat="server"
           ontextchanged="txtSearch_TextChanged">

protected void txtSearch_TextChanged(object sender, EventArgs e)
        {
            //its working
        }

i tried this but its not working...