Server Error in '/' Application.

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[SqlException (0x80131904): Transaction (Process ID 90) was deadlocked on lock | communication buffer resources with another process and has been chosen as the deadlock victim. Rerun the transaction.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +2573710
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +6014662
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +297
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +4291
   System.Data.SqlClient.SqlDataReader.TryHasMoreRows(Boolean& moreRows) +242
   System.Data.SqlClient.SqlDataReader.TryReadInternal(Boolean setTimeout, Boolean& more) +275
   System.Data.SqlClient.<>c__DisplayClass189_0.<ReadAsync>b__0(Task t) +75
   System.Data.SqlClient.SqlDataReader.InvokeRetryable(Func`2 moreFunc, TaskCompletionSource`1 source, IDisposable objectToDispose) +90
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   System.Data.Entity.Utilities.CultureAwaiter`1.GetResult() +38
   System.Data.Entity.Core.Objects.Internal.<InitializeAsync>d__0.MoveNext() +1784
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) +26
   System.Data.Entity.Core.Objects.Internal.<InitializeAsync>d__0.MoveNext() +876
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   System.Data.Entity.Utilities.CultureAwaiter.GetResult() +35
   System.Data.Entity.Core.Objects.Internal.<ExecuteAsync>d__0`1.MoveNext() +1399
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   System.Data.Entity.Utilities.CultureAwaiter`1.GetResult() +59
   System.Data.Entity.Core.Objects.<ExecuteInTransactionAsync>d__3d`1.MoveNext() +856
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   System.Data.Entity.Utilities.CultureAwaiter`1.GetResult() +59
   System.Data.Entity.Infrastructure.<ProtectedExecuteAsync>d__9`1.MoveNext() +393
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   System.Data.Entity.Utilities.CultureAwaiter`1.GetResult() +59
   System.Data.Entity.Core.Objects.<GetResultsAsync>d__e.MoveNext() +638
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   System.Data.Entity.Utilities.CultureAwaiter`1.GetResult() +59
   System.Data.Entity.Internal.<FirstMoveNextAsync>d__0.MoveNext() +259
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   System.Data.Entity.Infrastructure.<FirstOrDefaultAsync>d__25`1.MoveNext() +345
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   Microsoft.AspNet.Identity.CultureAwaiter`1.GetResult() +59
   Microsoft.AspNet.Identity.EntityFramework.<GetUserAggregateAsync>d__6c.MoveNext() +690
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   Microsoft.AspNet.Identity.CultureAwaiter`1.GetResult() +59
   Microsoft.AspNet.Identity.<ValidateUserName>d__4.MoveNext() +587
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   Microsoft.AspNet.Identity.<ValidateAsync>d__0.MoveNext() +293
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   Microsoft.AspNet.Identity.<UpdateAsync>d__5.MoveNext() +295
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   Microsoft.AspNet.Identity.CultureAwaiter`1.GetResult() +59
   Microsoft.AspNet.Identity.<AddToRoleAsync>d__83.MoveNext() +1139
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
   Microsoft.AspNet.Identity.AsyncHelper.RunSync(Func`1 func) +266
   Microsoft.AspNet.Identity.UserManagerExtensions.AddToRole(UserManager`2 manager, TKey userId, String role) +119
   Befroush.Code.Services.UserService.Add(User user, String password, List`1 roles, City city) in D:\MyProgram\Befroush\Feyzi\Trunk\Trunk\Code\Services\UserService.cs:443
   Befroush.MvcApplication.Session_Start(Object sender, EventArgs e) in D:\MyProgram\Befroush\Feyzi\Trunk\Trunk\Befroush\Global.asax.cs:261
   System.Web.SessionState.SessionStateModule.RaiseOnStart(EventArgs e) +10072608
   System.Web.SessionState.SessionStateModule.CompleteAcquireState() +165
   System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData) +1126
   System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +261
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +50
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +163