public ResponseData DeleteMaterial([FromBody] Material material)
        {
            String lang   = GetLanguage();
            var    entity = _db.Materials.FirstOrDefault(item => item.Id == material.Id);

            // If image exist, try delete it
            if (entity != null && entity.ImagePath != null)
            {
                String filePath = Path.Combine(
                    Path.Combine(_environment.WebRootPath, _imageFolderPath),
                    Path.GetFileName(entity.ImagePath)
                    );
                GC.Collect();
                GC.WaitForPendingFinalizers();
                System.IO.File.Delete(filePath);
            }
            // Remove material from database
            try
            {
                _db.Remove(_db.Materials.Single(a => a.Id == material.Id));
                _db.SaveChanges();
            }
            catch { };
            return(new ResponseData()
            {
                reqType = "delete",
                material = material,
                messages = new List <String>()
                {
                    (String)_translate.materialDeleteSuccess[lang]
                },                                                                                // Success : Material was deleted
                isError = false
            });
        }