验证证书和安装证书

 protected void Page_Load(object sender, EventArgs e)
    {

   if (!isExsitCertificate(StoreLocation.CurrentUser, StoreName.Root, X509FindType.FindByIssuerName, "CN=颁发者名称"))
            {
                //从证书文件载入证书，如果含有私钥的，需要提供保存证书时设置的密码
                string path = Server.MapPath(@"") + "\\scriptx\\Root.cer";
                X509Certificate2 myX509Certificate2 = new X509Certificate2(
                            path,    //证书路径
                            "",     //证书的私钥保护密码
                            X509KeyStorageFlags.Exportable  //表示此证书的私钥以后还可以导出
                            );
                X509Store Rootstore = new X509Store(StoreName.Root, StoreLocation.CurrentUser);

                Rootstore.Open(OpenFlags.ReadWrite);

                Rootstore.Add(myX509Certificate2);
                Rootstore.Close();

            }

   
}

//校验证书是否已存在

public bool isExsitCertificate(
     StoreLocation location, StoreName name,
     X509FindType findType, string findValue)
    {

        bool isExist = false;
        X509Store store = new X509Store(name, location);
        try
        {
            // create and open store for read-only access
            store.Open(OpenFlags.ReadOnly);
            // search store
            foreach (X509Certificate2 singelCertificate in store.Certificates)
            {
                if (singelCertificate.IssuerName.Name == findValue)
                {
                    isExist = true;
                    return isExist;
                }
            }
        }
        catch { }
        finally
        {

            store.Close();
        }
       


        return isExist;
    }