using ICallbackeventhandler to call code behind functions form javascript in c#

oh, It's badly for typesetting in this forum.

.aspx file function GetWeather() { var value=document.getElementById("txtName").value; UseCallback(value,""); } function GetWeatherFromServer(value,context) { alert(value);//get your result from DB } GetWeather();

Sorry for not clearly about your issue, and this is my example for ICallbackeventhandler, hope helps for you. public partial class Index : System.Web.UI.Page, ICallbackEventHandler { protected void Page_Load(object sender, EventArgs e) { string reference = Page.ClientScript.GetCallbackEventReference(this, "arg", "GetWeatherFromServer", "context"); string cbScript = "function UseCallback(arg,context)" + "{" + reference + ";" + "}"; Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "UseCallback", cbScript, true); } #region ICallbackEventHandler private string value = string.Empty; public string GetCallbackResult() { return value; } public void RaiseCallbackEvent(string eventArgument) { value = GetStringFromDB(eventArgument); } #endregion