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Unable to evaluate the expression

I'm unable to debug the the SaveFileToDisk method. Please me help me out how to resolve the issue. Thanks in advance.
private void Download_TapGestureRecognizer_Tapped(object sender, EventArgs e)
{
try
{
PortalTeacherDairyAttachmentList attachment = ((TappedEventArgs)e).Parameter as PortalTeacherDairyAttachmentList;
byte[] attachmentbyte = attachment.Attachment;
DependencyService.Get<IDownloadManager>().SaveFileToDisk(attachment.FileName,attachmentbyte);
}
catch (Exception ex)
{
}
}
SaveFileToDiskCode:
{
Toast.MakeText(Android.App.Application.Context, "Downloading started...", ToastLength.Long).Show();
var dir = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads);
var absolutepath = dir.AbsolutePath;
string name = filename;
string filePath = System.IO.Path.Combine(absolutepath, name);
try
{
System.IO.File.WriteAllBytes(filePath, data);
var mediaScanIntent = new Intent(Intent.ActionMediaScannerScanFile);
mediaScanIntent.SetData(Uri.FromFile(new File(filePath)));
Xamarin.Forms.Forms.Context.SendBroadcast(mediaScanIntent);
OpenFile(filePath, filename);
Toast.MakeText(Android.App.Application.Context, "File downloaded at" + filePath, ToastLength.Long).Show();
CreateNotificationChannel(name);
}
catch (System.Exception e)
{
System.Console.WriteLine(e.ToString());
Toast.MakeText(Android.App.Application.Context, "Error occured", ToastLength.Long).Show();
}
}

Flurl exception not being caught

I don't understand why but I'm receiving Flurl Exceptions and those are not being caught by the try/catch block. Any ideas on why that's happening?
Here's the code:
try
{
var x = await Utils.Sales.GetUrl()
.PostJsonAsync(new Sale
{
MerchantId = Constants.Sandbox.MerchantId
})
.ReceiveJson<Sale>();
var b = x;
}
catch (FlurlHttpTimeoutException)
{
//LogError("Timed out!"); //todo:
}
catch (FlurlHttpException ex)
{
var x = ex.Message;
//todo:
//if (ex.Call.Response != null)
// LogError("Failed with response code " + call.Response.StatusCode);
//else
// LogError("Totally failed before getting a response! " + ex.Message);
}
catch (Exception ex)
{
var a = ex.Message;
}
Here's the output (the only reason why I know the exception is being thrown):

Maybe this page will help https://msdn.microsoft.com/zh-cn/library/jj619227.aspx
Sorry don't have a english version, you can try google translate it.
It's someting wrong with you catch exception type or await code.
Try this way catch your exception:
```
try
{
await t1;
}
catch (AggregateException ex)
{
var innerEx = ex.InnerExceptions[0];
if (innerEx is NotSupportedException)
{
...
}
else if (innerEx is NotImplementedException)
{
...
}
else
{
...
}
}
```

Exception thrown by page redirection in asp.net

I have this code
protected void Button_Click(object sender, EventArgs e)
{
try
{
// some code
con.Open();
string result = command.ExecuteScalar().ToString();
if (result != string.Empty)
{
// some code
Response.Redirect("Default.aspx");
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
con.Close();
}
It gives an exception from Response.Redirect("Default.aspx");
ex: Thread was being aborted.
any idea why?
thanx

Redirecting from within a Try...Catch statement will result in this Exception being thrown, so this is not what you want to do.
I would update your code to;
string result = string.Empty;
try
{
// some code
con.Open();
result = command.ExecuteScalar().ToString();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
con.Close();
}
if (result != string.Empty)
{
// some code
Response.Redirect("Default.aspx");
}

This is a typical Exception that is thrown by ASP.NET when performing a redirect. It's quite well documented on the Interweb.
Try the following catch block to swallow the exception and all should be fine. It's supposed to do nothing!
catch(ThreadAbortException)
{
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
con.Close();
}

event handler cannot be executed

I got a problem in my WP-7 app.
I have an event when I read from the cloud - OpenReadCompletedEventHandler,
but somehow when the event occurs the EventHandler cannot be executed.
Here is my functions:
public void SetCategories()
//set the Companies table from Shret.net DataBase
{
try
{
WebClient webClient = new WebClient();
Uri uri = new Uri("http://api.sherut.net/?method=Category");
webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
try
{
webClient.OpenReadAsync(uri);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
DataContractJsonSerializer serializer = null;
try
{
serializer = new DataContractJsonSerializer(typeof(Categories));
var categories = (Categories)serializer.ReadObject(e.Result);
// foreach (Company c in companies.data)
// MessageBox.Show(c.Name + " " + c.CompanyID+" "+c.CompanyGUID);
//לכתוב לבסיס נתונים באפליקציה
BuildCategoriesDB(); //build the local data base
AddCategoriesData(categories);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
It reads from the cloud, but it doesn't go inside the handler: webClient_OpenReadCompleted

Check to make sure the event is being created and "thrown".

Parsing JSON object with Windows Phone 7

I'm trying to read from a Uri which i created and to display it on windows phone 7 app.
(I'm doing this tutorial:http://msdn.microsoft.com/en-us/windowsmobile/Video/hh237494).
My problem is that the program doesnt get into the OpenReadCompletedEventHandler and i dont know why. (i putted message box in order to debug and i found out that the program doesnt get into the OpenReadCompletedEventHandler). Here is the relevant code:
void myButton_Click(object sender, RoutedEventArgs e)
{
try
{
WebClient webClient = new WebClient();
Uri uri = new Uri("http://localhost:44705/Service1.svc/GetAllBrands");
webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
try
{
webClient.OpenWriteAsync(uri);
MessageBox.Show("opening sucsseded");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
MessageBox.Show("OpenRead Handler");
// OpenWriteCompletedEventArgs temp = (OpenWriteCompletedEventArgs)e;
DataContractJsonSerializer serializer = null;
try
{
serializer = new DataContractJsonSerializer(typeof(ObservableCollection<Brand>));
ObservableCollection<Brand> Brands = serializer.ReadObject(e.Result) as ObservableCollection<Brand>;
foreach (Brand b in Brands)
{
int id = b.BrandId;
string name = b.BrandName;
listBrands.Items.Add(id + " " + name);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Thanks in advance!

I have never used this but a quick google takes me to this page on MSDN - http://msdn.microsoft.com/en-us/library/system.net.webclient.openreadcompleted.aspx
This should tell you why it's not working - because you are using a read event for a write operation. You should be using OpenWriteCompletedEventHandler with OpenWriteAsync as per this page on MSDN - http://msdn.microsoft.com/en-us/library/system.net.webclient.openwritecompleted.aspx