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public static string GetMd5Hash(string input)
{
    try
    {
        var md5Hasher = MD5.Create();
        
        var data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));
        
        var sBuilder = new StringBuilder();
        
        foreach (var t in data)
        {
            sBuilder.Append(t.ToString("x2"));
        }

        return sBuilder.ToString();
    }
    catch (Exception ex)
    {
        MessageBox.Show("Error in GetMd5Hash: " + ex.Message);

        return "";
    }
}

public static bool VerifyMd5Hash(string input, string hash)
{
    try
    {
        var hashOfInput = GetMd5Hash(input);
        var comparer = StringComparer.OrdinalIgnoreCase;

        return 0 == comparer.Compare(hashOfInput, hash);
    }
    catch (Exception ex)
    {
        MessageBox.Show("Error in VerifyMd5Hash: " + ex.Message);

        return "";
    }
}