A database is often more convenient than physical storage options because retrieval of a database record for user data can concurrently supply the file content (for example, an avatar image).For small file uploads, a database is often faster than physical storage (file system or network share) options.Storage scenariosĬommon storage options for files include: Azure Security: Ensure appropriate controls are in place when accepting files from usersįor more information on implementing security measures, including examples from the sample app, see the Validation section.Overload a system with the result that the system crashes.įor information on reducing the attack surface area when accepting files from users, see the following resources:.
Uploading malicious code to a system is frequently the first step to executing code that can: †The sample app demonstrates an approach that meets the criteria.
For example, logging the file name or displaying in UI (Razor automatically HTML encodes output). Don't use a file name provided by the user or the untrusted file name of the uploaded file.† HTML encode the untrusted file name when displaying it. Use a safe file name determined by the app.Do not persist uploaded files in the same directory tree as the app.†.Disable execute permissions on the file upload location.† A dedicated location makes it easier to impose security restrictions on uploaded files. Upload files to a dedicated file upload area, preferably to a non-system drive.Security steps that reduce the likelihood of a successful attack are: Compromise networks and servers in other ways.Use caution when providing users with the ability to upload files to a server.
View or download sample code ( how to download) Security considerations Your valuable feedback, question, or comments about this article are always Core supports uploading one or more files using buffered model binding for smaller files and unbuffered streaming for larger files. I would like to have feedback from my blog readers. I hope you liked this article on the file upload control in asp.net. Note: In the same way you can upload multiple files in ASP.NET by setting the AllowMultiple= ” true” property as shown below:. Response.TransmitFile(Server.MapPath(filePath)) Response.AddHeader("Content-Disposition", "attachment filename=\"" + filePath + "\"") Response.ContentType = "application/docx" Response.ContentType = "application/pdf" Įlse if ((".docx")) Response.ContentType = "application/txt" Įlse if ((".pdf")) Protected void OnLnkDownload_Click(object sender, EventArgs e) LblMessage.Text = "File uploaded sucessfully to the folder: -" + " Files/" + fileUpload1.FileName LblFilename.Text = "Files/" + fileUpload1.FileName Protected void OnLnkUpload_Click(object sender, EventArgs e)įilename = Path.GetFileName() įileUpload1.SaveAs(Server.MapPath("Files/" + filename)) Protected void Page_Load(object sender, EventArgs e) Upload and Download files from Folder (Directory) in ASP.Net using C#