ASP.NET

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public partial class _Default : System.Web.UI.Page<br />
<br />
, ICallbackEventHandler   I face difficulty here <br />
{<br />
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    IList<product> list = null;<br />
   <br />
    protected void Page_Load(object sender, EventArgs e)<br />
    {<br />
        // Register the client callbacks <br />
        RegisterClientCallbacks(); <br />
    }<br />
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    private void RegisterClientCallbacks()<br />
    {<br />
        string callbackRef = ClientScript.GetCallbackEventReference(this, "arg", "RecieveServerData", "context");<br />
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        string script = String.Empty;<br />
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        if (!ClientScript.IsClientScriptBlockRegistered("CallServer"))<br />
        {<br />
            script = "function CallServer(arg,context) { " + callbackRef + "}";<br />
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            ClientScript.RegisterClientScriptBlock(this.GetType(), "CallServer", script, true);<br />
        }<br />
    }<br />
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   <br />
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    public string GetCallbackResult()<br />
    {<br />
        return HtmlTableHelper.ConvertProductListToTable(list); <br />
    }<br />
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    public void RaiseCallbackEvent(string eventArgument)<br />
    {<br />
        if (String.IsNullOrEmpty(eventArgument)) return;<br />
        <br />
        list = ProductRepository.GetProducts(eventArgument); <br />
    }<br />
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   <br />
}<br />
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</product>