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Client Callbacks in ASP.NET 2.0

, 24 May 2006 CPOL
Explains the concept of client callbacks in ASP.NET 2.0.
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page, ICallbackEventHandler   
{
    string callbackResult;
protected void Page_Load(object sender, EventArgs e)
{
    string cbref = Page.ClientScript.GetCallbackEventReference(this, "arg", "JSCallback", "context");
    //Response.Write(cbref);
    string cbScr = string.Format("function UseCallBack(arg, context) {{ {0}; }} ", cbref);
  //  Response.Write("<BR>" + cbScr);

    Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "UseCallBack", cbScr, true);
}

    #region ICallbackEventHandler Members

    public string GetCallbackResult()
    {
        return callbackResult;
    }

    public void RaiseCallbackEvent(string eventArgument)
    {
        // perform some real operation
        callbackResult = "DotNET Rocks!";
    }

    #endregion

}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

NasirAliKhan
Web Developer
United Arab Emirates United Arab Emirates
Iam Nasir Ali Khan, working a software architect in Dubai, works primarily on Microsoft Platform, MCTS certified for windows/web/distributed/mobile/enterprise applications.
Also teaches CS courses in a university in dubai.

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