ShareDataWithBaseClass.cs

public class SharedStepsBaseClass : Steps
{
    protected UserContext UserContext
    {
        get
        {
            var result = (UserContext)ScenarioContext["userContext"];
            if (result == null)
            {
                result = new UserContext();
                ScenarioContext["userContext"] = result;
            }
            return result;
        }
    }
}

[Binding]
public class ShareDataWithBaseClassSteps2 : SharedStepsBaseClass
{
    [When(@"the user opens the assigned tasks")]
    public void WhenTheUserOpensTheAssignedTasks()
    {
        // Read the user information from the scenario context through the 
        // property declared in the base class.
        var tasks = TaskManagement.GetAssignedTasks(UserContext.UserName);
        //...
    }
}