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.aspx page
============
Connection Check
On Body call javascript function onload="startPolling()"
public partial class ConnectionCheck : System.Web.UI.Page, ICallbackEventHandler
{
#region ICallbackEventHandler Members
public string GetCallbackResult()
{
if (CanDownloadData())
return "Connected";
else return "Not Connected";
}
public void RaiseCallbackEvent(string eventArgument)
{
}
#endregion
protected void Page_Load(object sender, EventArgs e)
{
//Ajax.Utility.RegisterTypeForAjax(typeof(ConnectionCheck));
RegisterCallbacks();
}
private void RegisterCallbacks()
{
string sbReference = ClientScript.GetCallbackEventReference(this, "arg", "ReceiveServerData", "context");
string cbScript = String.Empty;
// check if the script is already registered or not
if (!ClientScript.IsClientScriptBlockRegistered("CallServer"))
{
cbScript = @" function CallServer(arg,context) { " + sbReference + "}";
ClientScript.RegisterClientScriptBlock(this.GetType(), "CallServer", cbScript, true);
}
}
private bool CanDownloadData()
{
WebClient client = new WebClient();
byte[] data = null;
try
{
data = client.DownloadData("http://www.google.com");
}
catch (Exception ex)
{
}
if (data != null && data.Length > 0) return true;
else return false;
}
}
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