System.Net.WebUtility.UrlEncodeToBytes C# (CSharp) Method

        public static byte[] UrlEncodeToBytes(byte[] value, int offset, int count)
        {
            if (!ValidateUrlEncodingParameters(value, offset, count))
            {
                return null;
            }

            bool foundSpaces = false;
            int unsafeCount = 0;

            // count them first
            for (int i = 0; i < count; i++)
            {
                char ch = (char)value[offset + i];

                if (ch == ' ')
                    foundSpaces = true;
                else if (!IsUrlSafeChar(ch))
                    unsafeCount++;
            }

            // nothing to expand?
            if (!foundSpaces && unsafeCount == 0)
            {
                var subarray = new byte[count];
                Buffer.BlockCopy(value, offset, subarray, 0, count);
                return subarray;
            }

            // expand not 'safe' characters into %XX, spaces to +s
            byte[] expandedBytes = new byte[count + unsafeCount * 2];
            GetEncodedBytes(value, offset, count, expandedBytes);
            return expandedBytes;
        }