Check User Has Write Permission on Folder C#

C# > Files > Directory > GetAccessControl

GetAccessControl: returns the Windows access control list (ACL) for a directory
GetAccessRules: gets a collection of the access rules associated with the specified security identifier

Example: check write permission on folder

public static bool HasWritePermission(string dir)

        {
            bool Allow = false;
            bool Deny = false;
            DirectorySecurity  acl = null;
            try
            {
                acl = Directory.GetAccessControl(dir);
            }
            catch (System.IO.DirectoryNotFoundException)
            {
                throw new Exception("DirectoryNotFoundException");
            }
            if (acl == null)
                return false;
            AuthorizationRuleCollection  arc = acl.GetAccessRules(true, true, typeof(System.Security.Principal.SecurityIdentifier));
            if (arc == null)
                return false;
            foreach (FileSystemAccessRule rule in arc)
            {
                if ((FileSystemRights.Write & rule.FileSystemRights) != FileSystemRights.Write)
                    continue;
                if (rule.AccessControlType == AccessControlType.Allow)
                    Allow = true;
                else if (rule.AccessControlType == AccessControlType.Deny)
                    Deny = true;
            }
            return Allow && !Deny;
        }