public ReconcileResult Reconcile( 
   ReconcileOptions reconcileOptions,
   PostOptions postOptions
)

{
  // Must be called within QueuedTask.Run
  void GetVersionConflictsInfoInUpdateDeleteType(
    ServiceConnectionProperties featureServiceConnectionProperties,
    string featureClassName)
  {
    // To illustrate the conflict between versions,
    // the feature is updated in the child version and deleted in the parent version.

    long featureObjectIDForEdit = Int64.MinValue;

    // Get branch versioned service
    using (Geodatabase fsGeodatabase = new Geodatabase(featureServiceConnectionProperties))
    using (VersionManager versionManager = fsGeodatabase.GetVersionManager())
    using (Version defaultVersion = versionManager.GetDefaultVersion())
    using (Geodatabase defaultGeodatabase = defaultVersion.Connect())
    using (FeatureClass defaultFeatureClass = defaultGeodatabase.OpenDataset<FeatureClass>(featureClassName))
    using (FeatureClassDefinition defaultFeatureClassDefinition = defaultFeatureClass.GetDefinition())
    {
      // Create a feature in the default version to edit in a branch
      defaultGeodatabase.ApplyEdits(() =>
      {
        using (RowBuffer rowBuffer = defaultFeatureClass.CreateRowBuffer())
        {
          rowBuffer["NAME"] = "Loblolly Pine";
          rowBuffer["TREEAGE"] = 1;
          rowBuffer[defaultFeatureClassDefinition.GetShapeField()] = new MapPointBuilderEx(new Coordinate2D(1, 1),
            SpatialReferenceBuilder.CreateSpatialReference(4152, 0)).ToGeometry();

          using (Feature feature = defaultFeatureClass.CreateRow(rowBuffer))
          {
            featureObjectIDForEdit = feature.GetObjectID();
          }
        }
      });
      // Add newly created feature in the filter
      QueryFilter queryFilter = new QueryFilter { ObjectIDs = new List<long> { featureObjectIDForEdit } };

      // Create a branch version
      VersionDescription versionDescription = new VersionDescription("UpdateDeleteConflictType",
        "Update-Delete version conflict type", VersionAccessType.Public);

      // Edit the feature in the branch 
      using (Version editVersion = versionManager.CreateVersion(versionDescription))
      using (Geodatabase branchGeodatabase = editVersion.Connect())
      using (FeatureClass featureClass = branchGeodatabase.OpenDataset<FeatureClass>(featureClassName))
      using (RowCursor rowCursor = featureClass.Search(queryFilter, false))
      {
        branchGeodatabase.ApplyEdits(() =>
        {
          while (rowCursor.MoveNext())
          {
            using (Row row = rowCursor.Current)
            {
              row["TREEAGE"] = 100;
              row["NAME"] = $"{row["Name"]}_EditInBranch";
              row.Store();
            }
          }
        });

        // Delete the feature from the default version
        defaultGeodatabase.ApplyEdits(() =>
        {
          defaultFeatureClass.DeleteRows(queryFilter);
        });

        // Reconcile options
        ReconcileOptions reconcileOptions = new ReconcileOptions(defaultVersion)
        {
          ConflictResolutionType = ConflictResolutionType.FavorEditVersion,
          ConflictDetectionType = ConflictDetectionType.ByRow,
          ConflictResolutionMethod = ConflictResolutionMethod.Continue
        };

        // Reconcile with default
        ReconcileResult reconcileResult = editVersion.Reconcile(reconcileOptions);

        // Check for conflicts
        bool hasConflictsReconcileResults = reconcileResult.HasConflicts;
        bool hasConflictsAfterReconcile = editVersion.HasConflicts();

        // Fetch conflicts
        IReadOnlyList<Conflict> conflictsAfterReconcile = editVersion.GetConflicts();

        // Iterate conflicts
        foreach (Conflict conflict in conflictsAfterReconcile)
        {
          // Object ID of row where conflict occurs
          long objectId = conflict.ObjectID;

          ConflictType conflictType = conflict.ConflictType;

          IReadOnlyList<FieldValue> ancestorVersionValues = conflict.AncestorVersionValues;
          object nameAncestor = ancestorVersionValues.FirstOrDefault(f => f.FieldName.Contains("NAME")).Value;
          object treeAgeAncestor =
            ancestorVersionValues.FirstOrDefault(f => f.FieldName.Contains("TREEAGE")).Value;

          IReadOnlyList<FieldValue> childVersionValues = conflict.ChildVersionValues;
          object nameChild = childVersionValues.FirstOrDefault(f => f.FieldName.Contains("NAME")).Value;
          object treeAgeChild = childVersionValues.FirstOrDefault(f => f.FieldName.Contains("TREEAGE")).Value;

          IReadOnlyList<FieldValue> parentVersionValues = conflict.ParentVersionValues;

          IReadOnlyList<Field> originalFields = defaultFeatureClassDefinition.GetFields();

          string datasetName = conflict.DatasetName;
        }
      }
    }
  }
}

{
  // 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
        }
      }
    }
  }
}

{
  // Must be called within QueuedTask.Run
  void PartialPostingSnippet(Version designVersion, FeatureClass supportStructureFeatureClass, List<long> deletedSupportStructureObjectIDs)
  {
    // Partial posting allows developers to post a subset of changes made in a version.
    // One sample use case is an electric utility that uses a version to design the facilities in
    // a new housing subdivision. At some point in the process, one block of new houses have been
    // completed, while the rest of the subdivision remains unbuilt.  Partial posting allows the user
    // to post the completed work, while leaving not yet constructed features in the version to be
    // posted later. Partial posting requires a branch-versioned feature service using ArcGIS
    // Enterprise 10.9 and higher

    // Specify a set of features that were constructed
    QueryFilter constructedFilter = new QueryFilter()
    {
      WhereClause = "ConstructedStatus = 'True'"
    };
    // This selection represents the inserts and updates to the support
    // structure feature class that we wish to post
    using (Selection constructedSupportStructures = supportStructureFeatureClass.Select(constructedFilter, SelectionType.ObjectID,
             SelectionOption.Normal))
    {
      // Specifying which feature deletions you wish to post is slightly trickier, since you cannot issue
      // a query to fetch a set of deleted features Instead, a list of ObjectIDs must be used
      using (Selection deletedSupportStructures = supportStructureFeatureClass.Select(null, SelectionType.ObjectID, SelectionOption.Empty))
      {
        deletedSupportStructures.Add(deletedSupportStructureObjectIDs); //deletedSupportStructureObjectIDs is defined as List<long>

        // Perform the reconcile with partial post
        ReconcileOptions reconcileOptions = new ReconcileOptions(); // Reconcile against Default
        reconcileOptions.ConflictDetectionType = ConflictDetectionType.ByColumn;
        reconcileOptions.ConflictResolutionMethod = ConflictResolutionMethod.Continue;
        reconcileOptions.ConflictResolutionType = ConflictResolutionType.FavorEditVersion;

        /*
        PostOptions postOptions = new PostOptions(); 
        
        // PartialPostSelections - Deprecated since Pro SDK 3.7. Use PartialPostOptions instead. 
        postOptions.PartialPostSelections = new List<Selection>()
          {
            constructedSupportStructures, deletedSupportStructures
          };
        postOptions.ServiceSynchronizationType = ServiceSynchronizationType.Synchronous;
        */

        PartialPostOptions partialPostOptions = new PartialPostOptions(); // Partial post against the Default
        partialPostOptions.Selections = new List<Selection>()
        {
          constructedSupportStructures, deletedSupportStructures
        };
        partialPostOptions.ServiceSynchronizationType = ServiceSynchronizationType.Synchronous;

        ReconcileResult reconcileResult = designVersion.Reconcile(reconcileOptions, partialPostOptions);

        // Use the reconcileResult ...
      }
    }
  }
}