ArcGIS Pro 2.6 API Reference Guide
SetCurrentPageNumber Method
Example 

ArcGIS.Desktop.Layouts Namespace > MapSeries Class : SetCurrentPageNumber Method
A String value.
Sets the current map series page number. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public void SetCurrentPageNumber( 
   string pageNumber
)
Public Sub SetCurrentPageNumber( _
   ByVal pageNumber As String _
) 

Parameters

pageNumber
A String value.
Exceptions
ExceptionDescription
This method must be called within the lambda passed to QueuedTask.Run.
Example
//Set the current page to match a specific page number

//Perform on the worker thread
await QueuedTask.Run(() =>
{
  MapSeries MS = layout.MapSeries as MapSeries;
  MS.SetCurrentPageNumber("IV");
});
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

MapSeries Class
MapSeries Members