ArcGIS Pro 2.3 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 Sub SetRotation( _
   ByVal rotation As Double _
) 
public void SetRotation( 
   double rotation
)

Parameters

rotation
Double
Exceptions
ExceptionDescription
This method must be called within the lambda passed to QueuedTask.Run.
Remarks
Positive values rotate the element counter-clockwise, negative values rotate the element clockwise.
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, Windows 7

See Also

Reference

Element Class
Element Members