IClientChannel.Close Take too much time

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C#

WCF

C#4.0

Dear All,
I have problem with Channel Factory. After I complete operation, I want to close channel.
IClinetChannel.Close()take too much time (more than 3 minutes). Can you please guide why this behavior. What is suitable way to close Channel

Bellow is sample code

  IAdminServiceTEMP srvTmp = Core.ServiceModel.ChannelFactory.CreateChannel<IAdminServiceTEMP>();
                Task<GenericResponse<BTCH_DETLInfo>>.Factory.FromAsync(srvTmp.BeginReadContractBatchData, srvTmp.EndReadContractBatchData, request, TaskCreationOptions.None)
                    .ContinueWith(resp =>
                    {
                        if (resp != null)
                        {
                            cmsBatchDetail = resp.Result.ResultSet;
                        }
                    }).Wait();


//Bellow code for close channel take lot of time for closing current Channel;
                Core.ServiceModel.ChannelFactory.CloseChannel();

//Code for closing channel
IClientChannel channel = m_channel[factoryNme] as IClientChannel;
                    if (channel == null) return;
                    try
                    {
                        if (channel.State == CommunicationState.Faulted)
                        {
                            channel.Abort();
                        }
                        channel.Close();


                    }
                    catch
                    {
                        channel.Abort();
                    }