Transaction to change the state of a Workitem. It corresponds to the UPS DIMSE N-ACTION operation "Change UPS State". State changes are used to claim ownership, complete, or cancel a Workitem.

'Declaration
 
Public Function ChangeState( _
   ByVal State As UPSState, _
   ByVal TransactionUID As System.String, _
   Optional ByVal Encoding As DicomDataEncoding _
) As System.Net.Http.HttpResponseMessage

public System.Net.Http.HttpResponseMessage ChangeState( 
   UPSState State,
   System.string TransactionUID,
   DicomDataEncoding Encoding
)

WorkItemWebClient wwc = new WorkItemWebClient(BaseUri);
var resp = wwc.ChangeState(UPSState.INPROGRESS, "1.2.3.4.5.6.7.8.9");
Log($"Change State response: {resp.StatusCode}");