How to find internet connection using async method

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C#

public static void isConnected()
        {
                WebClient client = new WebClient();
                client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
                client.OpenReadAsync(new Uri("http://www.google.com"));
        }

static void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
         e.Result();  
        }

when bulid the solution i got below error message

`Non-invocable member 'System.Net.OpenReadCompletedEventArgs.Result' cannot be used like a method`

pls help me

Posted 2-Apr-15 2:47am

Rnshanmugavadivel

Updated 2-Apr-15 3:05am

Suvendu Shekhar Giri

v2

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Richard MacCutchan · Answer 1 · 2015-04-02T03:01:00

Solution 1

Result is a property, not a method. See https://msdn.microsoft.com/en-us/library/system.net.openreadcompletedeventargs_properties(v=vs.110).aspx[^].

Posted 2-Apr-15 3:01am

Richard MacCutchan

Comments

Rnshanmugavadivel 2-Apr-15 9:04am

Thanks you very Much..
How to check internet connection using above code.. Please explain and help me...
i am fresher..

Richard MacCutchan 2-Apr-15 9:40am

Explain what? You just need to check the results in your event handler. Read the documentation to see what information is made available on completion of the command.

Sergey Alexandrovich Kryukov 2-Apr-15 11:37am

Sure, a 5.
—SA

Praveen Kumar Upadhyay · Answer 2 · 2015-04-02T03:39:00

Solution 2

Change your code to below.

C#

public static void isConnected()
        {
                WebClient client = new WebClient();
                client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
                client.OpenReadAsync(new Uri("http://www.google.com"));
        }

static void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
            reply = (Stream)e.Result;
            s = new StreamReader (reply);
            string strResult = s.ReadToEnd ();
        }

Posted 2-Apr-15 3:39am

Praveen Kumar Upadhyay

Comments

Rnshanmugavadivel 2-Apr-15 10:23am

I use above code i got below error message in line (reply=(Stream)e.Result;

An exception occurred during the operation, making the result invalid. Check InnerException for exception details.

{System.Reflection.TargetInvocationException: An exception occurred during the operation, making the result invalid.
Check InnerException for exception details. ---> System.Security.SecurityException ---> System.Security.SecurityException: Security error.
at System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
at System.Net.Browser.BrowserHttpWebRequest.<>c__DisplayClassa.<endgetresponse>b__9(Object sendState)
at System.Net.Browser.AsyncHelper.<>c__DisplayClass4.<beginonui>b__1(Object sendState)
--- End of inner exception stack trace ---
at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
at System.Net.Browser.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.WebClient.GetWebResponse(WebRequest request, IAsyncResult result)
at System.Net.WebClient.OpenReadAsyncCallback(IAsyncResult result)
--- End of inner exception stack trace ---
at System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary()
at System.Net.OpenReadCompletedEventArgs.get_Result()
at ProView.ViewModels.DashBoardViewModel.client_OpenReadCompleted(Object sender, OpenReadCompletedEventArgs e)
at System.Net.WebClient.OnOpenReadCompleted(OpenReadCompletedEventArgs e)
at System.Net.WebClient.OpenReadOperationCompleted(Object arg)}

Maheswaran_S 2-Apr-15 11:02am

R u calling the service from any intranet connections ?