Validation Error on SaveChanges()

I have the following Action method inside my Asp.net mvc web application:-

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(SDJoin sdj, FormCollection formValues)
{
Try
{
//code goes here
repository.InsertOrUpdateSD(sdj.StorageDevice, User.Identity.Name, assetid);
repository.Save();
}
catch (Exception ex)
{
//code goes here
}
PopulateViewBagData();
return View(sdj);
}

which calls the following method:-

public void InsertOrUpdateSD(TMSStorageDevice sd, string username, long assetid)
{
var resource = entities.Resources.AsNoTracking().SingleOrDefault(a => a.RESOURCEID == assetid);
if (sd.TMSStorageDeviceID == default(int))
{
// New entity
int technologyypeID = GetTechnologyTypeID("Storage Device");
Technology technology = new Technology
{
IsDeleted = true,
IsCompleted = false,
TypeID = technologyypeID,
Tag = "SD" + GetTagMaximumeNumber2(technologyypeID).ToString(),
StartDate = DateTime.Now,
IT360ID = assetid
};

InsertOrUpdateTechnology(technology);
Save();

sd.TMSStorageDeviceID = technology.TechnologyID;
tms.TMSStorageDevices.Add(sd);
}
}

My model class is as follow:-

public partial class TMSStorageDevice
{
public int TMSStorageDeviceID { get; set; }
public string Name { get; set; }
public Nullable<decimal> size { get; set; }
public int RackID { get; set; }
public string CustomerName { get; set; }
public string Comment { get; set; }
public byte[] timestamp { get; set; }

public virtual Technology Technology { get; set; }
public virtual TMSRack TMSRack { get; set; }
}
but if i call the Create action method i will get the following exception:-

System.Data.Entity.Validation.DbEntityValidationException was caught
HResult=-2146232032
Message=Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.
Source=EntityFramework
StackTrace:
at System.Data.Entity.Internal.InternalContext.SaveChanges()
at System.Data.Entity.Internal.LazyInternalContext.SaveChanges()
at System.Data.Entity.DbContext.SaveChanges()
at TMS.Models.Repository.Save() in c:\Users\Administrator\Documents\Visual Studio 2012\Projects\TMS\TMS\Models\Repository.cs:line 1926
at TMS.Controllers.StorageDeviceController.Create(SDJoin sdj, FormCollection formValues) in c:\Users\Administrator\Documents\Visual Studio 2012\Projects\TMS\TMS\Controllers\StorageDeviceController.cs:line 160
InnerException:


Can anyone advice what is wrong, as i double check my code and every thing should work fine ?
Thanks

I know the question is old now, but I hope someone finds this useful, too.

1. Most likely (and indeed, judging by your comments) the **error was that your variable doesn't pass Model validation.**
2. The other way to see the errors you couldn't see (**without changing the code**) is to look at the exception using the QuickWatch window. The problem is that 'View Details' window that you can open from exception tooltip doesn't show EntityValidationErrors. And without a catch block you don't have any exception variable you can look at in QuickWatch. Luckily, QuickWatch has PseudoVariables.
**So, using "$exception" pseudovariable you can easily take a look at the current unhandled exception in QuickWatch window.** (Please, see screenshots below)
[Exception Details window][1] and
[QuickWatch window with $exception pseudovariable][2]


[1]:

[2]:

Although this is an old post but this approach can be more fruitful!

[Credits][1]

Try something like this

try
{
pcontext.SaveChanges();
}
catch (System.Data.Entity.Infrastructure.DbUpdateConcurrencyException ex)
{
Console.WriteLine(ex.InnerException);
}
catch (System.Data.Entity.Core.EntityCommandCompilationException ex)
{
Console.WriteLine(ex.InnerException);
}
catch (System.Data.Entity.Core.UpdateException ex)
{
Console.WriteLine(ex.InnerException);
}

catch (System.Data.Entity.Infrastructure.DbUpdateException ex) //DbContext
{
Console.WriteLine(ex.InnerException);
}

catch (Exception ex)
{
Console.WriteLine(ex.InnerException);
throw;
}


[1]:

[To see links please register here]

You haven't shown the `Save()` method but if you can add code like this to it you'll get an exception that contains all the details you're looking for

try
{
this.context.SaveChanges();
}
catch (System.Data.Entity.Validation.DbEntityValidationException dbEx)
{
Exception raise = dbEx;
foreach (var validationErrors in dbEx.EntityValidationErrors)
{
foreach (var validationError in validationErrors.ValidationErrors)
{
string message = string.Format("{0}:{1}",
validationErrors.Entry.Entity.ToString(),
validationError.ErrorMessage);
// raise a new exception nesting
// the current instance as InnerException
raise = new InvalidOperationException(message, raise);
}
}
throw raise;
}