مشکل بکاپ گیری از دیتابیس در برنامه

سلام خدمت دوستان 

برای بکاپ گیری از دیتابیس توسط کاربر برنامه یه Stored Procedure تعریف شده توو اسکیوال به درستی کار میکنه 

اما هنگام اجرا سمت برناممه اخطار میده هرچی گشتم نفهمیدم علتش چه 

اگه امکانداره راهنمایم کنید 

متن خطا :

"System.Data.Entity.Core.EntityCommandExecutionException:
An error occurred while executing the command definition. See the inner exception for details. --->
System.Data.SqlClient.SqlException: Cannot perform a backup or restore operation within a transaction.
nBACKUP DATABASE is terminating abnormally.
   at System.Data.SqlClient.SqlConnection.OnError
(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption, Boolean shouldCacheForAlwaysEncrypted)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<Reader>b__c(DbCommand t, DbCommandInterceptionContext`1 c)
   at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
   at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext)
   at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
   --- End of inner exception stack trace ---
   at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
   at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.Execute(EntityCommand entityCommand, CommandBehavior behavior)
   at System.Data.Entity.Core.EntityClient.EntityCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Entity.Core.EntityClient.EntityCommand.ExecuteNonQuery()
   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteFunctionCommand(EntityCommand entityCommand)
   at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass4b.<ExecuteFunction>b__4a()
   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
   at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass4b.<ExecuteFunction>b__49()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteFunction(String functionName, ObjectParameter[] parameters)
   at DataModelLayer.SystemDBEntities.Sp_BackupDatabaseSystemDB(String backupString) in D:\\C#\\System\\System\\System\\DataModelLayer\\DataModel.Context.cs:line 2370
   at System.windows.Min.MenuItem_Click(Object sender, RoutedEventArgs e) in D:\\C#\\System\\System\\System\\System\\windows\\Min.xaml.cs:line 149"

کدی که سمت برنامه اجرا میشه:

        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            Microsoft.Win32.SaveFileDialog dlg = new Microsoft.Win32.SaveFileDialog();
            dlg.FileName = "System" + String.Format("{0:yyyyMMdd}", Convert.ToDateTime(calender.Text))+ "-"+ DateTime.Now.ToString("HHmmss"); // Default file name
            dlg.DefaultExt = ".bak"; 
            dlg.Filter = "Database Backup (.bak)|*.bak"; 

            Nullable<bool> result = dlg.ShowDialog();

            if (result == true)
            {
                
                SaveDB = dlg.FileName;
            }

            try
            {

                Db.Sp_BackupDatabaseSystemDB(
                    SaveDB);
                Db.SaveChanges();

                MessageBox.Show($"نسخه پشتیبان دیتابیس " + "\n" +
                "با موفقیت تهیه شد",
                $"نسخه پشتیبان دیتابیس",
                MessageBoxButton.OK, MessageBoxImage.None, MessageBoxResult.OK, MessageBoxOptions.RightAlign | MessageBoxOptions.RtlReading);


            }
            catch (Exception ex)
            {
              
                MessageBox.Show("هنگام تهیه نسخه پشتیبان اطلاعات در دیتابیس مشکلی بوجود آماده لطفاً دوباره سعی کنید" + ex.ToString(), "خطای ارتباطی");
            }
            finally
            {

            }

        }

Stored Procedure :

ALTER procedure [dbo].[Sp_BackupDatabaseSystemDB]
@BackupString nvarchar(max)    
 as
    
    backup database SystemDB to disk=@BackupString with compression

ممنون میشم کمکم کنید