public string CalculateMD5Hash(string input) { // step 1 calculate MD5 hash from input MD5 md5 = System.Security.Cryptography.MD5.Create(); byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input); byte[] hash = md5.ComputeHash(inputBytes); // step 2 convert byte array to hex string StringBuilder sb = new StringBuilder(); for (int i = 0; i } Call The Function. string hash = CalculateMD5Hash(abcdefghijklmnopqrstuvwxyz); You will get output like this.. C3FCD3D76192E4007DFB496CCA67E13B

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How to get MD5 key?