create/append a text file

I want to catch exceptions in a log file. I want to name my log file by date. If the file exists, it should append to it, if file does not exist, it should create one. I tried the following code but get error access to path is denied. I have shared the logs folder and given full control to every one. Please suggest what needs to be done.

I am getting the correct FileName as 11-11-2010.txt and Fullname (with path) as \\myserver\Projects\Results\Logs\11-11-2010.txt

Error: Access to the path '\\myserver\Projects\Results\Logs\11-11-2010.txt' is denied.

Thank Youpublic void WriteLog(string TextStr) { string FilePath = ConfigurationManager.AppSettings["LogPath"].ToString(); //Set Filename By Date string FileName = DateTime.Now.ToString("MM-dd-yyyy") + ".txt"; string FullName = FilePath + Fil ...