public static void Delete(int equationId)
 {
     using (EquationEntities entities = new EquationEntities())
     {
         var equationFile = entities.EquationFiles.FirstOrDefault(x => x.EquationFileId == equationId);
         entities.EquationFiles.Remove(equationFile);
         entities.SaveChanges();
     }
 }
        public static long SaveEquationFile(EquationFile equationFile)
        {
            long id = 0;

            using (EquationEntities entities = new EquationEntities())
            {
                entities.EquationFiles.Add(equationFile);
                entities.SaveChanges();
                id = equationFile.EquationFileId;
            }
            return(id);
        }
 public static void LogError(string errorMessage)
 {
     using (EquationEntities entities = new EquationEntities())
     {
         ErrorLog errorLog = new ErrorLog();
         errorLog.UserId       = 1;
         errorLog.ErrorMessage = errorMessage;
         errorLog.InsertDate   = DateTime.Now;
         entities.ErrorLogs.Add(errorLog);
         entities.SaveChanges();
     }
 }
 public static void LogActivity(List <int> tagSubjectRelationIds, long equationid)
 {
     using (EquationEntities entities = new EquationEntities())
     {
         foreach (var item in tagSubjectRelationIds)
         {
             TagSubjectRelationEquation _tagSubjectRelationEquation = new TagSubjectRelationEquation();
             _tagSubjectRelationEquation.EquationId           = equationid;
             _tagSubjectRelationEquation.TagSubjectRelationId = item;
             entities.TagSubjectRelationEquations.Add(_tagSubjectRelationEquation);
             entities.SaveChanges();
         }
     }
 }