When selling our ideas, we tend to overpromise in our enthusiasm for our creation. In our vision of how we hope it will be, we leave no room for failure. The result will probably be disappointing. Not disastrous, but a little less than expected.

To get MD5 hash in C# use this method. It returns same value AS MD5() function in PHP

        public string GetMD5Hash(string input)
        {
            System.Security.Cryptography.MD5CryptoServiceProvider x = new System.Security.Cryptography.MD5CryptoServiceProvider();
            byte[] bs = System.Text.Encoding.UTF8.GetBytes(input);
            bs = x.ComputeHash(bs);
            System.Text.StringBuilder s = new System.Text.StringBuilder();
            foreach (byte b in bs)
            {
                s.Append(b.ToString("x2").ToLower());
            }
            string password = s.ToString();
            return password;
        }

And this one is in PHP

These both will return the same value