How to identify memory leak in .NET application

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C#

ASP.NET

MVC

Hello ,

I have given a project to identify the root cause for the memory leaks in .net based web application.

This is the first time i have given such task. I not sure how to look for the memory leaks any suggestions please.

I updated my question with code block will that code block result in any memory leak.
Can anybody review the code block and provide some information about code line which may cause memory leaks if any.

What I have tried:

checking for static classes and using diagnostic tools provided by visual studio 2019

<pre>[HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult SaveFileData(FileEdit model)
        {
            var file = new File();
            EntityMapper<FileEdit, File>.Map(model, file);
            string fileName = string.Empty;
            string relativePath = string.Empty;
            string extension = string.Empty;

            file.SchoolId = SessionHelper.CurrentSession.SchoolId;
            file.IsActive = true;
            bool result = false;
            if (model.PostedFile != null)
            {
                fileName = model.PostedFile.FileName;
                extension = Path.GetExtension(model.PostedFile.FileName).Replace(".", "");


                //string resourceDir = Server.MapPath(Constants.ResourcesDir);
                //string fileContent = Server.MapPath(Constants.FileDir);
                //string fileModule = Server.MapPath(Constants.BlogDir + "/Module_" + model.ModuleId);
                //string filePath = Server.MapPath(Constants.BlogDir + "/Module_" + model.ModuleId + "/User_" + SessionHelper.CurrentSession.Id);


                string resourceDir = MyConfiguration.Instance.WriteFilePath + Constants.ResourcesDir;
                string fileContent = MyConfiguration.Instance.WriteFilePath + Constants.FileDir;
                string fileModule = MyConfiguration.Instance.WriteFilePath + Constants.FileDir + "/Module_" + model.ModuleId;
                string filePath = MyConfiguration.Instance.WriteFilePath + Constants.FileDir + "/Module_" + model.ModuleId + "/User_" + SessionHelper.CurrentSession.Id;

                Common.Helpers.CommonHelper.CreateDestinationFolder(resourceDir);
                Common.Helpers.CommonHelper.CreateDestinationFolder(fileContent);
                Common.Helpers.CommonHelper.CreateDestinationFolder(fileModule);
                Common.Helpers.CommonHelper.CreateDestinationFolder(filePath);
                fileName = Guid.NewGuid() + "_" + fileName;
                relativePath = Constants.FileDir + "/Module_" + model.ModuleId + "/User_" + SessionHelper.CurrentSession.Id + "/" + fileName;

                var extId = _fileTypeList.FirstOrDefault(r => r.Extension.Contains(extension.ToLower())).TypeId;

                fileName = Path.Combine(filePath, fileName);

                model.PostedFile.SaveAs(fileName);
                file.FileName = model.PostedFile.FileName;
                file.FilePath = relativePath;
                file.FileTypeId = extId;
                file.FolderId = !string.IsNullOrWhiteSpace(model.ParentFolderId) ? Convert.ToInt32(EncryptDecryptHelper.DecryptUrl(model.ParentFolderId)) : 0;
                file.SectionId = !string.IsNullOrWhiteSpace(model.SectId) ? Convert.ToInt32(EncryptDecryptHelper.DecryptUrl(model.SectId)) : 0;

                if (model.FolderId > 0)
                {
                    file.UpdatedBy = SessionHelper.CurrentSession.Id;
                    result = _fileService.Update(file);
                }
                else
                {
                    file.CreatedBy = SessionHelper.CurrentSession.Id;
                    result = _fileService.Insert(file);
                }
                return Json(new OperationDetails(result), JsonRequestBehavior.AllowGet);
            }
            return Json(new OperationDetails(result), JsonRequestBehavior.AllowGet);
        }