Kindly assist to correct below codes

Question

i want to group after selecting

For Each row As LabtransType In svcClient.GetLabtrans(MdlConn.checkDB, " ").GroupBy(Function(x) x.result_ref).ToList()
TvWaiter.Nodes(0).Nodes.Add(New TreeNode(row.result_ref))
Next 

 i got this error

Additional information: Unable to cast object of type 'Grouping[System.String,Hospital_dbms.LabtransType]' to type 'Hospital_dbms.LabtransType'.

kindly any one with idea assist please 

Answer 1

Hi Bikesh Srivastava, I didn't exactly understand what you want to convey. I am doing my service method implementation in base class only.

public class Monitor : IMonitor

{

   public Task AddMonitor(Monitor mo)

   {

   // Implementation goes here 

   }

   public Task RemoveMonitor(Monitor mo)

   {

       // Implementation goes here

   }

}

 

But anyway my code id now working. Once i decorated my IMonitorCallback with (IsOneWay = true)] its started working perfectly.

interface IMonitorCallback

{

   [OperationContract(IsOneWay = true)]

   void OnAdded(Monitor data);

 

   [OperationContract(IsOneWay = true)]

   void OnRemoved(Monitor data);

}

 

Answer 2

I think you need to understand of WCF in deep.

because if you are creating interface  and implement then you have to declare all method in base class.

Answer 3

http://stackoverflow.com/questions/22466523/405-method-not-allowed-wcf-web-service-after-second-request