public bool IsVersioningSupported()

{
  // Must be called within QueuedTask.Run
  Geodatabase ConnectToVersion(Geodatabase geodatabase, string versionName)
  {
    Geodatabase connectedVersion = null;

    if (geodatabase.IsVersioningSupported())
    {
      using (VersionManager versionManager = geodatabase.GetVersionManager())
      using (Version version = versionManager.GetVersion(versionName))
      {
        connectedVersion = version.Connect();
      }
    }

    return connectedVersion;
  }
}

{
  // Must be called within QueuedTask.Run
  void ReconcileAndPost(Geodatabase geodatabase)
  {
    // Get a reference to our version and our parent
    if (geodatabase.IsVersioningSupported())
    {
      using (VersionManager versionManager = geodatabase.GetVersionManager())
      using (Version currentVersion = versionManager.GetCurrentVersion())
      using (Version parentVersion = currentVersion.GetParent())
      {
        // Create a ReconcileOptions object
        ReconcileOptions reconcileOptions = new ReconcileOptions(parentVersion);
        reconcileOptions.ConflictResolutionMethod = ConflictResolutionMethod.Continue; // continue if conflicts are found
        reconcileOptions.ConflictDetectionType = ConflictDetectionType.ByRow; //Default
        reconcileOptions.ConflictResolutionType = ConflictResolutionType.FavorTargetVersion; //or FavorEditVersion

        // Reconcile
        ReconcileResult reconcileResult = currentVersion.Reconcile(reconcileOptions);
        if (!reconcileResult.HasConflicts)
        {
          //No conflicts, perform the post
          PostOptions postOptions = new PostOptions(parentVersion);
          //var postOptions = new PostOptions(); for default version
          postOptions.ServiceSynchronizationType = ServiceSynchronizationType.Synchronous; //Default

          // Post - Deprecated since Pro SDK 3.6 / Enterprise 12.0 . Use Reconcile(reconcileOptions, postOptions) instead.
          // currentVersion.Post(postOptions);

          currentVersion.Reconcile(reconcileOptions, postOptions);
        }
      }
    }
  }
}

{
  // Must be called within QueuedTask.Run
  void ReconcileAndPost2(Geodatabase geodatabase)
  {
    // Get a reference to our version and our parent
    if (geodatabase.IsVersioningSupported())
    {
      using (VersionManager versionManager = geodatabase.GetVersionManager())
      using (Version currentVersion = versionManager.GetCurrentVersion())
      using (Version parentVersion = currentVersion.GetParent())
      {
        // Create a ReconcileOptions object
        ReconcileOptions reconcileOptions = new ReconcileOptions(parentVersion);
        reconcileOptions.ConflictResolutionMethod = ConflictResolutionMethod.Continue; // continue if conflicts are found
        reconcileOptions.ConflictDetectionType = ConflictDetectionType.ByRow; //Default
        reconcileOptions.ConflictResolutionType = ConflictResolutionType.FavorTargetVersion; //or FavorEditVersion

        PostOptions postOptions = new PostOptions(parentVersion);
        //var postOptions = new PostOptions(); for default version
        postOptions.ServiceSynchronizationType = ServiceSynchronizationType.Synchronous; //Default

        // Reconcile
        ReconcileResult reconcileResult = currentVersion.Reconcile(reconcileOptions, postOptions);
        if (reconcileResult.HasConflicts)
        {
          //TODO resolve conflicts
        }
      }
    }
  }
}