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I'm using Facebook SDK C# Library in Asp.Net 3.5 Application. When I'm trying to compile the code below give me the errors. As I know dynamic type using in 4.0 framework. So is anyway to rewrite it in order make it work? I have a reference to System.Core 3.5 but it's still not compiling protected void Page_Load(object sender, EventArgs e) { if (Request.Params.AllKeys.Contains("signed_request")) { var result = FacebookSignedRequest.Parse(FacebookContext.Current.AppSecret, Request.Params["signed_request"]); dynamic signedRequestValue = result.Data; this.RegistrationData = signedRequestValue.registration; } else { Response.Redirect("~/"); } } protected dynamic RegistrationData { get; set; } Error 1 Cannot define a class or member that utilizes 'dynamic' because the compiler required type 'System.Runtime.CompilerServices.DynamicAttribute' cannot be found. Are you missing a reference to System.Core.dll? Error 2 Cannot define a class or member that utilizes 'dynamic' because the compiler required type 'System.Runtime.CompilerServices.DynamicAttribute' cannot be found. Are you missing a reference to System.Core.dll?

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