how can we check any file is password protect or not in c#

Question

Naimish Makwana · Answer

Try below method: public static bool IsPasswordProtected(string filePath, string password) { try { using (FileStream fileStream = new FileStream(filePath, FileMode.Open)) { // Try to open the file with the provided password using (StreamReader streamReader = new StreamReader(fileStream, false)) { streamReader.ReadToEnd(); // Read the file to validate the password } } // If the file was successfully opened and read, it is not password-protected return false; } catch (SecurityException) { // The file is password-protected return true; } catch (Exception) { // An exception occurred, which might indicate that the file is password-protected return true; } } Thanks

Rajkiran Swain · Answer

using System.IO; using System.IO.Packaging; public bool IsFilePasswordProtected(string filePath) { try { using (Package package = Package.Open(filePath, FileMode.Open, FileAccess.Read)) { // Check if the package contains the encryption package relationship if (package.RelationshipExists(PackageRelationshipTypes.Encryption)) { return true; // File is password protected } } } catch (IOException) { // Handle any IO exceptions } catch (System.Security.Cryptography.CryptographicException) { // Handle cryptographic exceptions } return false; // File is not password protected or an error occurred }

Sam Hobbs · Answer

There is a Nuget package for System.IO.Packaging. I do not know if it is necessary to install that package. When I install it I then get an error saying PackageRelationshipTypes does not exist. Intellisense says I need to install an NPOI package and there are multiple NPOI packages. Therefore if the code provided by Rajkiran Swain works then I think we need an explanation of how to get the System.IO.Packaging namespace.

raj raj · Answer

Hi naimish your code is not working

raj raj · Answer

@rajkiran code is not working keyword PackageRelationshipTypes is unknown