How to check authorized access for folders and read access to directory? Here is my code

public static bool IsFileAuthorizedAccess(string path)
{
    //TODO
    bool retValue;
    try
    {
        retValue = !string.IsNullOrWhiteSpace(path) && File.Exists(path);
        DirectorySecurity obj = Directory.GetAccessControl(path);
        FileSecurity oqbj = File.GetAccessControl(path);
    }
    catch (UnauthorizedAccessException ex)
    {
        retValue = true;
    }
    catch (Exception ex)
    {
        throw ex;
    }
    return retValue;
}

public static bool CanReadFile(string path)
{
    //TODO
    var readAllow = false;
    var readDeny = false;
    try
    {
        var accessControlList = Directory.GetAccessControl(path);
        if (accessControlList == null)
            return false;
        var accessRules = accessControlList.GetAccessRules(true, true, typeof(System.Security.Principal.SecurityIdentifier));
        if (accessRules == null)
            return false;

        foreach (FileSystemAccessRule rule in accessRules)
        {
            if ((FileSystemRights.Read & rule.FileSystemRights) != FileSystemRights.Read) continue;

            if (rule.AccessControlType == AccessControlType.Allow)
                readAllow = true;
            else if (rule.AccessControlType == AccessControlType.Deny)
                readDeny = true;
        }
    }
    catch (Exception ex)
    {
        throw;
    }
    return readAllow && !readDeny;
}