I´m new to mvc and I try to to do a simple Ajax call to my controller, so I can use a date- and timepickers in my create view.

You can see this [thread](https://stackoverflow.com/questions/32714653/making-a-simple-ajax-call-to-controller-in-mvc/32715429#32715429) where I previously asked for help. But now I have encountered a new problem.

I get this error when I try to save my data:
*An exception of type 'System.Data.Entity.Infrastructure.DbUpdateException' occurred in EntityFramework.dll but was not handled in user code*

```
 public ActionResult CreateEvent(string createSammantrade, string createStartTime, string createEndTime, string createLokal)
    {
        Sammantrade sammantrade = new Sammantrade();

        sammantrade.sSammantrade = createSammantrade;
        sammantrade.sStartTid = Convert.ToDateTime(createStartTime);
        sammantrade.sSlutTid = Convert.ToDateTime(createEndTime);
        sammantrade.lID = Int32.Parse(createLokal);

        if (ModelState.IsValid)
        {
            db.Sammantrade.Add(sammantrade);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        ViewBag.lID = new SelectList(db.Lokal, "lID", "lLokal", sammantrade.lID);
        return View(sammantrade);
    }

```

EDIT:

```none
System.Data.Entity.Infrastructure.DbUpdateException was unhandled by user code
HResult=-2146233087
Message=An error occurred while updating the entries. See the inner exception for details.
Source=EntityFramework
StackTrace:
vid System.Data.Entity.Internal.InternalContext.SaveChanges()
vid System.Data.Entity.Internal.LazyInternalContext.SaveChanges()
vid System.Data.Entity.DbContext.SaveChanges()
vid VLVision.Controllers.SammantradesAdminController.CreateEvent(String createSammantrade, String createStartTime, String createEndTime, String createLokal) 
vid lambda_method(Closure , ControllerBase , Object[] )
vid System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
vid System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
vid System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
vid System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>
b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState)
vid System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)
vid System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End()
vid System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
vid System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>
b__3d()
vid System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>
b__3f()
InnerException:
HResult=-2146233087
Message=An error occurred while updating the entries. See the inner exception for details.
Source=EntityFramework
StackTrace:
vid System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update()
vid System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.<Update>
b__2(UpdateTranslator ut)
vid System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update[T](T noChangesResult, Func`2 updateFunction)
vid System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update()
vid System.Data.Entity.Core.Objects.ObjectContext.<SaveChangesToStore>
b__35()
vid System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
vid System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction)
vid System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass2a.<SaveChangesInternal>
b__27()
vid System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
vid System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal(SaveOptions options, Boolean executeInExistingTransaction)
vid System.Data.Entity.Core.Objects.ObjectContext.SaveChanges(SaveOptions options)
vid System.Data.Entity.Internal.InternalContext.SaveChanges()
InnerException:
Class=16
ErrorCode=-2146232060
HResult=-2146232060
LineNumber=1
Message=The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Sammantrade_Lokal". The conflict occurred in database "VLVision", table "dbo.Lokal", column 'lID'.
The statement has been terminated.
Number=547
Procedure=""
Server=localhost\SQLExpress
Source=.Net SqlClient Data Provider
State=0
StackTrace:
vid System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
vid System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
vid System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
vid System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
vid System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
vid System.Data.SqlClient.SqlDataReader.get_MetaData()
vid System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
vid System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds, Boolean describeParameterEncryptionRequest)
vid System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
vid System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
vid System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
vid System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
vid System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
vid System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<Reader>b__c(DbCommand t, DbCommandInterceptionContext`1 c)
vid System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
vid System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext)
vid System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior)
vid System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
vid System.Data.Entity.Core.Mapping.Update.Internal.DynamicUpdateCommand.Execute(Dictionary`2 identifierValues, List`1 generatedValues)
vid System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update()
InnerException: 

```