context.Load(_listitem, tmp => tmp.DisplayName,
                        tmp => tmp.File, tmp => tmp.File.Versions,
                        tmp => tmp.FieldValuesAsText);

context.ExecuteQuery();

if (_listitem.Versions.Count > 0)
{
 foreach (ListItemVersion version in _listitem.Versions)
  {
    if (version.IsCurrentVersion)
        continue;

    int id = version.VersionId;
    string lbl  =  version.VersionLabel;
// I need to get the data  for every version of the listitem
  }
}

static void Main(string[] args)
        {

            string siteCollectionUrl = "https://tenantname.sharepoint.com/sites/sitename";
            string userName = "username@tenant.onmicrosoft.com";
            string password = "yourpassword";

            // Namespace: Microsoft.SharePoint.Client
            ClientContext ctx = new ClientContext(siteCollectionUrl);

            // Namespace: System.Security
            SecureString secureString = new SecureString();
            password.ToList().ForEach(secureString.AppendChar);

            // Namespace: Microsoft.SharePoint.Client
            ctx.Credentials = new SharePointOnlineCredentials(userName, secureString);

            // Namespace: Microsoft.SharePoint.Client
            Site site = ctx.Site;

            ctx.Load(site);
            ctx.ExecuteQuery();
            Web web = ctx.Web;

            ctx.Load(web,w => w.ServerRelativeUrl,w => w.Lists);

            List list = web.Lists.GetByTitle("List1");

            ctx.Load(list);
            CamlQuery camlQuery = new CamlQuery();
            ListItemCollection itemColl = list.GetItems(camlQuery);

            ctx.Load(itemColl);

            ctx.ExecuteQuery();


            foreach (ListItem item in itemColl)

            {
                Console.WriteLine(item["Title"].ToString());
                ListItemVersionCollection itemversioncollection = item.Versions;

                ctx.Load(itemversioncollection);

                ctx.ExecuteQuery();

                for (int iVersionCount = 0; iVersionCount < itemversioncollection.Count; iVersionCount++)

                {

                    ListItemVersion version = itemversioncollection[iVersionCount];
                    Console.WriteLine(version.FieldValues["Title"].ToString());

                }



            }
        }