.NET (Core and Framework)

Exception Details: System.FormatException: The format of value 'application/json; charset=utf-8' is invalid.

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

[FormatException: The format of value 'application/json; charset=utf-8' is invalid.]
   System.Net.Http.Headers.MediaTypeHeaderValue.CheckMediaTypeFormat(String mediaType, String parameterName) +119919
   System.Net.Http.Headers.MediaTypeHeaderValue..ctor(String mediaType) +23
   System.Net.Http.ObjectContent.BuildHeaderValue(String mediaType) +63
   System.Net.Http.ObjectContent`1..ctor(T value, MediaTypeFormatter formatter, String mediaType) +66
   System.Net.Http.HttpRequestMessageExtensions.CreateResponse(HttpRequestMessage request, HttpStatusCode statusCode, T value, HttpConfiguration configuration) +892
   System.Net.Http.HttpRequestMessageExtensions.CreateResponse(HttpRequestMessage request, HttpStatusCode statusCode, T value) +104
   System.Web.Http.Dispatcher.HttpControllerDispatcher.HandleException(HttpRequestMessage request, Exception exception, HttpConfiguration configuration) +191
   System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) +284
   System.Net.Http.DelegatingHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) +41
   System.Web.Http.HttpServer.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) +347
   System.Net.Http.HttpMessageInvoker.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) +55
   System.Web.Http.WebHost.HttpControllerHandler.BeginProcessRequest(HttpContextBase httpContextBase, AsyncCallback callback, Object state) +316
   System.Web.Http.WebHost.HttpControllerHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +77
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +103
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

I searched in google but can't find the proper solution.

Please help me

public override void EndInit()  
{  
    base.EndInit();  
    customersRowChanging += customersRowChangeEvent;  
}  

public void customersRowChangeEvent(object sender, customersRowChangeEvent e)  
{  
    if (e.Row.Name.Length == 0)  
    {  
        e.Row.SetColumnError("name", "Customer name cannot be empty");  
    }  
    else  
    {  
        e.Row.SetColumnError("name", "");  
    }  
}  

try
     {
         Validate();
         customersBindingSource.EndEdit();
         customersTableAdapter.Update(samDataSet.customers);
         // other stuff here, close the form, etc.
     }
     catch(Exception ex)
     {
         // ... show a message box with the error.

     }

public void customersRowChangeEvent(object sender, customersRowChangeEvent e)  
{  
    if (e.Row.Name.Length == 0)  
    {  
        e.Row.SetColumnError("name", "Customer name cannot be empty"); 
        throw new System.Exception("Customer Name cannot be empty"); 
    }  
    else  
    {  
        e.Row.SetColumnError("name", "");  
    }  
}  

Public Function ShootPicture() As StorageFile
    Dim captureUI As New CameraCaptureUI
    captureUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg
    captureUI.PhotoSettings.AllowCropping = False
    Dim GetPhotoTask As Task(Of StorageFile) = captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo)
    GetPhotoTask.Wait() ' Blocks current thread until CaptureFileAsync task completes'
    Dim result As StorageFile = GetPhotoTask.Result
    Return result
End Function

Dim GetPhotoTask As Task(Of StorageFile) = captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo)
      Dim Photo As StorageFile = Await GetPhotoTask

public StorageFile ShootPicture()
{
    CameraCaptureUI captureUI = new CameraCaptureUI();
    captureUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg;
    captureUI.PhotoSettings.AllowCropping = false;
    Task<StorageFile> GetPhotoTask = captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo);
    GetPhotoTask.Wait();
    // Blocks current thread until CaptureFileAsync task completes
    StorageFile result = GetPhotoTask.Result;
    return result;
}