void Invalidate( 
   Relationship relationship
)

{
  await QueuedTask.Run(() =>
  {
    string message = String.Empty;
    bool creationResult = false;
    EditOperation editOperation = new EditOperation();

    using (Geodatabase geodatabase = new Geodatabase(new DatabaseConnectionFile(new Uri("path\\to\\sde\\file\\sdefile.sde"))))
    using (Table enterpriseTable = geodatabase.OpenDataset<Table>("LocalGovernment.GDB.piCIPCost"))
    {
      // Declare the callback here. We are not executing it .yet.
      editOperation.Callback(context =>
      {
        TableDefinition tableDefinition = enterpriseTable.GetDefinition();
        int assetNameIndex = tableDefinition.FindField("ASSETNA");

        using (RowBuffer rowBuffer = enterpriseTable.CreateRowBuffer())
        {
          // Either the field index or the field name can be used in the indexer.
          rowBuffer[assetNameIndex] = "wMain";
          rowBuffer["COST"] = 700;
          rowBuffer["ACTION"] = "Open Cut";

          // subtype value for "Abandon".
          rowBuffer[tableDefinition.GetSubtypeField()] = 3;

          using (Row row = enterpriseTable.CreateRow(rowBuffer))
          {
            // To Indicate that the attribute table has to be updated.
            context.Invalidate(row);
          }
        }
      }, enterpriseTable);

      try
      {
        creationResult = editOperation.Execute();
        if (!creationResult) message = editOperation.ErrorMessage;
      }
      catch (GeodatabaseException exObj)
      {
        message = exObj.Message;
      }
    }

    if (!string.IsNullOrEmpty(message))
    {
      Debug.WriteLine(message);
    }
  });
}

{
  await QueuedTask.Run(() =>
  {
    string message = String.Empty;
    bool modificationResult = false;
    using (Geodatabase geodatabase = new Geodatabase(new DatabaseConnectionFile(new Uri("path\\to\\sde\\file\\sdefile.sde"))))
    using (Table enterpriseTable = geodatabase.OpenDataset<Table>("LocalGovernment.GDB.piCIPCost"))
    {
      EditOperation editOperation = new EditOperation();
      editOperation.Callback(context =>
      {
        QueryFilter openCutFilter = new QueryFilter { WhereClause = "ACTION = 'Open Cut'" };

        using (RowCursor rowCursor = enterpriseTable.Search(openCutFilter, false))
        {
          TableDefinition tableDefinition = enterpriseTable.GetDefinition();
          int subtypeFieldIndex = tableDefinition.FindField(tableDefinition.GetSubtypeField());

          while (rowCursor.MoveNext())
          {
            using (Row row = rowCursor.Current)
            {
              // In order to update the Map and/or the attribute table.
              // Has to be called before any changes are made to the row.
              context.Invalidate(row);

              row["ASSETNA"] = "wMainOpenCut";

              if (Convert.ToDouble(row["COST"]) > 700)
              {
                // Abandon asset if cost is higher than 700 (if that is what you want to do).
                row["ACTION"] = "Open Cut Abandon";
                row[subtypeFieldIndex] = 3; //subtype value for "Abandon"   
              }

              //After all the changes are done, persist it.
              row.Store();

              // Has to be called after the store too.
              context.Invalidate(row);
            }
          }
        }
      }, enterpriseTable);

      try
      {
        modificationResult = editOperation.Execute();
        if (!modificationResult) message = editOperation.ErrorMessage;
      }
      catch (GeodatabaseException exObj)
      {
        message = exObj.Message;
      }
    }

    if (!string.IsNullOrEmpty(message))
      Debug.WriteLine(message);
  });
}