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Error the value could not be added to the collection on a web service

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Posted on by Community Member Microsoft Employee

Hello, I´m using VS 2016, I have this error:

2388.1.jpg

this is the code:

3107.2.jpg

The error comes out reaching this part: IOrganizationService service = (IOrganizationService)osProxy;

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Community Member Microsoft Employee on at

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RE: Error the value could not be added to the collection on a web service

You´re right, I´ve commented the line of ProxyTypesBehavior and the program works!

Thanks.
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Aric Levin 30,188 on at

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RE: Error the value could not be added to the collection on a web service

Hi Jhon,

Is the error on the osProxy.Service.Configuration.CurrentServiceEndpoint.Behaviors.Add line or on the service = (IOrganizationService)oxProxy line?

Can you check before the osProxy.Service.Configuration.CurrentServiceEndpoint.Behaviors.Add line if osProxy.Service.Configuration.CurrentServiceEndpoint.Behaviors has any values in it already?

You might not need it, or possibly check if it has values before calling the Add method of the class.

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