static X509Certificate2 GetCertificate(string thumbPrint)
{
    List<StoreLocation> locations = new List<StoreLocation>
        {
            StoreLocation.CurrentUser,
            StoreLocation.LocalMachine
        };

    foreach (var location in locations)
    {
        X509Store store = new X509Store(StoreName.My, location);
        try
        {
            store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
            X509Certificate2Collection certificates = store.Certificates.Find(
                X509FindType.FindByThumbprint, thumbPrint, true);
            if (certificates.Count >= 1)
            {
                return certificates[0];
            }
        }
        finally
        {
            store.Close();
        }
    }

    throw new ArgumentException($"A Certificate with Thumbprint '{thumbPrint}' could not be located.");
}