[OperationContractAttribute(Action = "http://tempuri.org/IService1/IO_CompareFiles", 
	ReplyAction = "http://tempuri.org/IService1/IO_CompareFilesResponse")]
Task<int> IO_CompareFilesAsync(
	string file1,
	string file2,
	string key
)

<OperationContractAttribute(Action := "http://tempuri.org/IService1/IO_CompareFiles", 
	ReplyAction := "http://tempuri.org/IService1/IO_CompareFilesResponse")> 
Function IO_CompareFilesAsync ( 
	file1 As String,
	file2 As String,
	key As String
) As Task(Of Integer)

[OperationContractAttribute(Action = L"http://tempuri.org/IService1/IO_CompareFiles", 
	ReplyAction = L"http://tempuri.org/IService1/IO_CompareFilesResponse")]
Task<int>^ IO_CompareFilesAsync(
	String^ file1, 
	String^ file2, 
	String^ key
)