Nethereum AddressValidator code

AddressValidator.cs

using System.Text.RegularExpressions;
using Nethereum.Util;

namespace SupplyChain.BlockChain.Validation
{
    /// <inheritdoc cref="IAddressValidator"/>
    public class AddressValidator : IAddressValidator
    {
        private static readonly Regex AddressRegex = new Regex("^0[xX]([A-Fa-f0-9]{40})$");
        private static readonly AddressUtil AddressUtil = new AddressUtil();

        /// <inheritdoc cref="IAddressValidator.IsValid(string)"/>
        public bool IsValid(string address)
        {
            // Doesn't match length, prefix and hex
            if (!AddressRegex.IsMatch(address))
            {
                return false;
            }

            // It's all lowercase, so no checksum needed
            if (address == address.ToLower())
            {
                return true;
            }

            // Do checksum
            return AddressUtil.IsChecksumAddress(address);
        }
    }
}

IAddressValidator.cs

namespace SupplyChain.BlockChain.Validation
{
    /// <summary>
    /// Validate Ethereum Address
    /// </summary>
    public interface IAddressValidator
    {
        /// <summary>
        /// Validate the Ethereum Address (https://github.com/Nethereum/Nethereum/issues/293)
        /// </summary>
        /// <param name="address">The Ethereum Address to validate.</param>
        /// <returns>
        ///   <c>true</c> if the specified address is valid; otherwise, <c>false</c>.
        /// </returns>
        bool IsValid(string address);
    }
}