string Caption {get; set;}

{
  // find all the table panes (table panes hosting map data)
  var tablePanes = FrameworkApplication.Panes.OfType<ITablePane>();
  var tablePane = tablePanes.FirstOrDefault(p => p is ITablePaneEx { Caption: "oldCaption" });
  if (tablePane is ITablePaneEx tablePaneEx)
    tablePaneEx.Caption = "newCaption";

  // find all the external table panes (table panes hosting external data)
  var externalPanes = FrameworkApplication.Panes.OfType<IExternalTablePane>();
  var externalTablePane = externalPanes.FirstOrDefault(p => p.Caption == "oldCaption");
  if (externalTablePane != null)
    externalTablePane.Caption = "newCaption";
}