The given key was not present in the dictionary.

actualll i want to add webservice to my XAML page then that error occur ..

exception snap shot :

{System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
  at System.ThrowHelper.ThrowKeyNotFoundException()
  at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
  at System.ServiceModel.Configuration.ServiceModelSectionGroup.get_Client()
  at System.ServiceModel.Description.ConfigLoader.LookupChannel(String configurationName, String contractName, Boolean wildcard)
  at System.ServiceModel.Description.ConfigLoader.LoadChannelBehaviors(ServiceEndpoint serviceEndpoint, String configurationName)
  at System.ServiceModel.ChannelFactory.ApplyConfiguration(String configurationName)
  at System.ServiceModel.ChannelFactory.InitializeEndpoint(String configurationName, EndpointAddress address)
  at System.ServiceModel.ChannelFactory`1..ctor(String endpointConfigurationName, EndpointAddress remoteAddress)
  at System.ServiceModel.ChannelFactory`1..ctor(String endpointConfigurationName)
  at System.ServiceModel.EndpointTrait`1.CreateSimplexFactory()
  at System.ServiceModel.EndpointTrait`1.CreateChannelFactory()
  at System.ServiceModel.ClientBase`1.CreateChannelFactoryRef(EndpointTrait`1 endpointTrait)
  at System.ServiceModel.ClientBase`1.InitializeChannelFactoryRef()
  at System.ServiceModel.ClientBase`1..ctor()
  at PLO.ClientWCF.ClientWCFClient..ctor()
  at PLO.ClientMaster..ctor()
  at PLO.Login.clientImage_MouseLeftButtonDown(Object sender, MouseEventArgs e)
  at System.Windows.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
  at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)}

 what to do...

thanx in advance 

What is the code that throws this error. It seems pretty straight forward, you are trying to use a key to snag a value and since the key does not exist, it is letting you know...

Ex object myObj = myCollection[myKey] throws the exception when myKey does not exist within myCollection...

;)

I also facing the same problem. I have added a WCF service in my code and calling the webservice throgh following code in xaml

CoreServicesClient svcCore = new CoreServicesClient();
            svcCore.GetDataCompleted += new EventHandler<GetDataCompletedEventArgs>(svcCore_GetDataCompleted);
            svcCore.GetDataAsync(5);

Getdata() is the default function which comes with Create WCF Service web site template. I just made changes in the name from "Service" to "CoreServices"

If anyone has a solution then let me know .

Check this link

it will solve your problem

if you check your app.config file then you will found " <endpoint address="" binding="wsHttpBinding" contract="....."  this line now you can change the binding="basicHttpBinding" instead of binding="wsHttpBinding" ...

then you take service reference now ServiceReferences.ClientConfig file will contains endpoint.