MS Azure - Bad Request 400 Error

Question

Hi, 
I have this line of code which throws a MobileServiceInvalidOperation exception every time the line of code is executed:
List<Account> accounts = await App.accountTable.Where(account => account.EmailAddress == email).ToListAsync();
This is the exception:
A first chance exception of type 'Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException' occurred in mscorlib.dll
Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException: The request could not be completed.  (Bad Request)
   at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient.<ThrowInvalidResponse>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient.<SendRequestAsync>d__1d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient.<RequestAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.WindowsAzure.MobileServices.MobileServiceTable.<ReadAsync>d__b.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.WindowsAzure.MobileServices.MobileServiceTable.<ReadAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.WindowsAzure.MobileServices.Query.MobileServiceTableQueryProvider.<Execute>d__8`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.WindowsAzure.MobileServices.Query.MobileServiceTableQueryProvider.<Execute>d__3`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.WindowsAzure.MobileServices.MobileServiceTableQuery`1.<ToListAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at eventsphere.Utilities.ValidationUtility.<CheckEmailExistsError>d__2.MoveNext()
I have a very similar line of code shown below which works perfectly fine:
List<Account> accounts = await App.accountTable.Where(account => account.Username == username).ToListAsync();
I am a bit puzzled by how one gives an error and the other doesn't.
This is my Accounts table definition:
CREATE TABLE [eventsphere].[Accounts] (
    [Id]           NVARCHAR (128)     DEFAULT (newid()) NOT NULL,
    [AccountId]    INT                IDENTITY (1, 1) NOT NULL,
    [Username]     NVARCHAR (MAX)     NULL,
    [EmailAddress] NVARCHAR (MAX)     NULL,
    [Password]     NVARCHAR (MAX)     NULL,
    [IsBusiness]   BIT                NOT NULL,
    [User_Id]      NVARCHAR (128)     NULL,
    [Business_Id]  NVARCHAR (128)     NULL,
    [Version]      ROWVERSION         NOT NULL,
    [CreatedAt]    DATETIMEOFFSET (7) DEFAULT (sysutcdatetime()) NOT NULL,
    [UpdatedAt]    DATETIMEOFFSET (7) NULL,
    [Deleted]      BIT                NOT NULL,
    CONSTRAINT [PK_eventsphere.Accounts] PRIMARY KEY NONCLUSTERED ([Id] ASC),
    CONSTRAINT [FK_eventsphere.Accounts_eventsphere.Businesses_Business_Id] FOREIGN KEY ([Business_Id]) REFERENCES [eventsphere].[Businesses] ([Id]),
    CONSTRAINT [FK_eventsphere.Accounts_eventsphere.Users_User_Id] FOREIGN KEY ([User_Id]) REFERENCES [eventsphere].[Users] ([Id])
GO
CREATE CLUSTERED INDEX [IX_CreatedAt]
    ON [eventsphere].[Accounts]([CreatedAt] ASC);
GO
CREATE NONCLUSTERED INDEX [IX_User_Id]
    ON [eventsphere].[Accounts]([User_Id] ASC);
GO
CREATE NONCLUSTERED INDEX [IX_Business_Id]
    ON [eventsphere].[Accounts]([Business_Id] ASC);
GO
CREATE TRIGGER [eventsphere].[TR_eventsphere_Accounts_InsertUpdateDelete] ON [eventsphere].[Accounts] AFTER INSERT, UPDATE, DELETE AS BEGIN UPDATE [eventsphere].[Accounts] SET [eventsphere].[Accounts].[UpdatedAt] = CONVERT(DATETIMEOFFSET, SYSUTCDATETIME())
FROM INSERTED WHERE inserted.[Id] = [eventsphere].[Accounts].[Id] END
This is the DataObject for the Accounts table:
namespace eventsphereService.DataObjects
    public class Account : EntityData
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int AccountId { get; set; }
        public string Username { get; set; }
        [DataType(DataType.EmailAddress)]
        public string EmailAddress { get; set; }
        public string Password { get; set; }
        public bool IsBusiness { get; set; }
        public string User_Id { get; set; }
        [DatabaseGenerated(DatabaseGeneratedOption.None)]
        [ForeignKey("User_Id")]
        [Association("UserIdAssociation", "UserId", "Id")]
        [Column(Order = 1)]
        public virtual User User { get; set; }
        public string Business_Id { get; set; }
        [DatabaseGenerated(DatabaseGeneratedOption.None)]
        [ForeignKey("Business_Id")]
        [Association("BusinessIdAssociation", "BusinessId", "Id")]
        public virtual Business Business { get; set; }
Any input or advice would be appreciated.
Thanks in advance!

Answer 1

You would need to use Fiddler tool to analyze the request sent to the Mobile Services to ensure you are sending the right data.
Let me know if this helps in investigating this issue.
Abdulwahab Suleiman