configure serilog with framework 3.5

[Rakesh Kapoor]

i downloaded serilog-net35 from github and compiled it. are there any samples that i can use. the ones that i copied have a compile issue and i am wondering if i missed something. i just used it in ninjatrader and i have a compile issue with the .writeto line, 

Strategy\testloggingstrateg.cs 'Serilog.Configuration.LoggerSinkConfiguration' does not contain a definition for 'File' and no extension method 'File' accepting a first argument of type 'Serilog.Configuration.LoggerSinkConfiguration' could be found (are you missing a using directive or an assembly reference?)

using Serilog;

using System.IO;

// This namespace holds all strategies and is required. Do not change it.

namespace NinjaTrader.Strategy

{

    /// <summary>

    /// Enter the description of your strategy here

    /// </summary>

    [Description("Enter the description of your strategy here")]

    public class testloggingstrateg : Strategy

    {

        #region Variables

        // Wizard generated variables

        private int myInput0 = 1; // Default setting for MyInput0

        // User defined variables (add any user defined variables below)

        #endregion

private ILogger log;

        /// <summary>

        /// This method is used to configure the strategy and is called once before any strategy method is called.

        /// </summary>

        protected override void Initialize()

        {

            CalculateOnBarClose = false;

        }

protected override void OnStartUp()

{

log = new LoggerConfiguration()

.WriteTo.File(@"c:\temp\" + Instrument.FullName + "log.txt")

.CreateLogger();

log.Information("Hello again!" + Instrument.FullName);

}

        /// <summary>

        /// Called on each bar update event (incoming tick)

        /// </summary>

        protected override void OnBarUpdate()

        {

log.Information("Hello again!" + Instrument.FullName);

        }

protected override void OnTermination()

{

    // Clean up your resources here

}