How to export loggedin user`s certificate programmatically

Problem 
You need to export of currently logged in user certificate in programmatic way.

Solution 

using System;

 

    using System.Collections.Generic;

    using System.Linq;

    using System.Text;

    using System.Security.Cryptography.X509Certificates;

    using System.Net;

    using System.Diagnostics;

    /// <summary>

    /// TODO: Update summary.

    /// </summary>

    public class CertificateHalper

    {

       public static  X509Certificate userCert = null;

        public static X509Certificate GetClientCertificate(string username)

        {

          // USERNAME= Active Directory User name , Use Environment.UserName to get user name

            if (userCert == null)

            {

                X509Store certStore = new X509Store(StoreLocation.CurrentUser);

                certStore.Open(OpenFlags.ReadOnly);

                X509Certificate2Collection certList = certStore.Certificates;

                foreach (X509Certificate cert in certList)

                {

                    if (cert.Subject == "CN=" + username)

                    {

                        userCert = cert;

                    }

                }

            }

          

            return userCert;

        }

    }