Newtonsoft.Json Assembly Conflict

Question

I use Netonsoft.Json in my project. It works fine until I start integrating Paypal SDK in my Project. My code is as below.

         String AccessToken =
  new PayPal.OAuthTokenCredential("", "").GetAccessToken(); ---->>>> This Line Throwing An Error
            PayPal.Api.Payments.Address add = new PayPal.Api.Payments.Address();
            add.city = TextBoxCity.Text;
            add.line1 = TextBoxAddress.Text;
            add.phone = TextBoxPhoneNumber.Text;
            add.postal_code = TextBoxZipcode.Text;
            add.state = TextBoxState.Text;
            PayPal.Api.Payments.CreditCard cc = new PayPal.Api.Payments.CreditCard();
            cc.number = TextBoxCreditCardNumber.Text;
            cc.first_name = TextBoxFirstName.Text;
            cc.last_name = TextBoxLastName.Text;
            cc.expire_month = Convert.ToInt16(TextBoxExpiryMonth.Text);
            cc.expire_year = Convert.ToInt16(TextBoxExpiryYear.Text);
            cc.cvv2 = TextBoxCVVNumber.Text;
            cc.billing_address = add;
            cc.Create(AccessToken);

and I get error as below

       System.IO.FileLoadException: Could not load file or assembly 'Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

I search on internet and found some solution to change config file. SO I change my config file as below

        <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
  <dependentAssembly>
    <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral"/>
     <bindingRedirect oldVersion="0.0.0.0-3.5.0.0" newVersion="4.5.0.0" />
  </dependentAssembly>
</assemblyBinding>

I also play around with assembly properties like Copy Local, Specific Version but nothing helps me to solve this. How Can I solve assembly conflict?

Answer 1

I just had the same problem and I solved it by updating the Newtonsoft.Json to the latest version using

Update-Package Newtonsoft.Json

and then going to Web.config and adding:

<dependentAssembly>
    <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed"/>
    <bindingRedirect oldVersion="0.0.0.0-4.5.0.0" newVersion="5.0.8"/>
</dependentAssembly>