public void Callback( 
   Action<EditOperation.IEditContext> action,
   IEnumerable<MapMember> mapMembers
)

public async Task CreatingARow()
{
    string message = String.Empty;
    bool creationResult = false;
    EditOperation editOperation = new EditOperation();

    await ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
    {

        using (Geodatabase geodatabase = new Geodatabase(
    new DatabaseConnectionFile(new Uri("path\\to\\sde\\file\\sdefile.sde"))))
        using (Table enterpriseTable = geodatabase.OpenDataset<Table>("LocalGovernment.GDB.piCIPCost"))
        {

            //var geodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(uri)) for a File GDB
            //
            //var shapeFileConnPath = new FileSystemConnectionPath(uri, FileSystemDatastoreType.Shapefile);
            //var shapefile = new FileSystemDatastore(shapeFileConnPath);
            //var table = shapefile.OpenDataset<Table>(strShapeFileName); for a Shape file

            //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))
        MessageBox.Show(message);

}