ArcGIS Pro 2.8 API Reference Guide
SetRotation Method
Example 

ArcGIS.Desktop.Layouts Namespace > Element Class : SetRotation Method
Double
Sets the rotation value for the element. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public void SetRotation( 
   double rotation
)
Public Sub SetRotation( _
   ByVal rotation As Double _
) 

Parameters

rotation
Double
Exceptions
ExceptionDescription
This method must be called within the lambda passed to QueuedTask.Run.
This element requires its mapview to be active
Remarks
Positive values rotate the element counter-clockwise, negative values rotate the element clockwise.
Placement for an element contained in graphics layer requires the mapview be active.
Example
//Modify and element's rotation value.

//Perform on the worker thread
await QueuedTask.Run(() =>
{
  double elmRot = element.GetRotation();
  elmRot = 22.5;

  element.SetRotation(elmRot); //You don't have to get to set; a shortcut would be: element.SetRotation(22.5);
});
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

Element Class
Element Members