Public Overloads Sub CalculateA1Async( _
   ByVal sessionId As String, _
   ByVal sheetName As String, _
   ByVal rangeName As String, _
   ByVal userState As Object _
) 

Dim instance As ExcelService
Dim sessionId As String
Dim sheetName As String
Dim rangeName As String
Dim userState As Object
 
instance.CalculateA1Async(sessionId, sheetName, rangeName, userState)

public void CalculateA1Async( 
   string sessionId,
   string sheetName,
   string rangeName,
   object userState
)