Problem with the StreamWriter for writing Exception

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SQL-Server

SQL-Server-2008

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Hello
I have made an application with asp.net4 and for this issue i want to make a text file that anytime any Exception raised , the Exception message to be written inside the text file.
so i have done something like below, but it doesn't work and infact does not write any thing.

public class EventLogger
        {
            public static void Log(string Message, LogType Type)
            {
                string FullFileName = string.Format("{0}-{1}-{2}.log", DateTime.Now.Year.ToString(), DateTime.Now.Month.ToString(), DateTime.Now.Day.ToString());
                string FullPath = string.Format("{0}\\{1}", HttpContext.Current.Server.MapPath("/Log/Log.txt"), FullFileName);
                StreamWriter Writer = new StreamWriter(FullFileName, true, System.Text.Encoding.UTF8);
                Writer.WriteLine(string.Format("{0} # {1}", Message.Replace("\r\n", "<br />"), Type.ToString()));
                Writer.Close();
                Writer.Dispose();
            }
        }

        public enum LogType
        {
            Error = -1,
            Warning = 0,
            Normal = 1
        }

shall i create any text file in the solution ?
i will be thankfull to help me find the problem .