How to use api without global token authentication

[Carlos Castillo Oporta]

`
using System;
using System.Diagnostics;
using Strava.NET.Api;
using Strava.NET.Client;
using Strava.NET.Model;

namespace Example
{
public class Example
{
public void main()
{

        // Configure OAuth2 access token for authorization: strava_oauth
        Configuration.Default.AccessToken = "YOUR_ACCESS_TOKEN";

        var apiInstance = new ActivitiesApi();
        var name = name_example;  // string | The name of the activity.
        var type = type_example;  // string | Type of activity. For example - Run, Ride etc.
        var startDateLocal = startDateLocal_example;  // string | ISO 8601 formatted date time.
        var elapsedTime = 56;  // int? | In seconds.
        var description = description_example;  // string | Description of the activity. (optional) 
        var distance = 3.4;  // float? | In meters. (optional) 
        var trainer = 56;  // int? | Set to 1 to mark as a trainer activity. (optional) 
        var photoIds = photoIds_example;  // string | List of native photo ids to attach to the activity. (optional) 
        var commute = 56;  // int? | Set to 1 to mark as commute. (optional) 

        try
        {
            // Create an Activity
            DetailedActivity result = apiInstance.CreateActivity(name, type, startDateLocal, elapsedTime, description, distance, trainer, photoIds, commute);
            Debug.WriteLine(result);
        }
        catch (Exception e)
        {
            Debug.Print("Exception when calling ActivitiesApi.CreateActivity: " + e.Message );
        }
    }
}

}
`

// Configure OAuth2 access token for authorization: strava_oauth
Configuration.Default.AccessToken = "YOUR_ACCESS_TOKEN";

This line make access token public and static but I need to use a different access token when calling an API. I creating a web app so every time a user ask for his activities a need to call api but without using a static access token.