Access to the path c:\...\Project.exe is denied

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MS-Access

I have a Windows setup project . I have to write the config parametrs in "Project.exe" file while setting up the project.While opening that file from c# code ,I am getting "Access to the path c:\...\Project.exe" is denied...How to solve this permission issue?I am using this code

Configuration config = ConfigurationManager.OpenExeConfiguration(filePath);           
config.AppSettings.Settings.Clear();
config.AppSettings.Settings.Add("DTD_XML_FILES_PATH", txtDTDFilesPath.Text);
if(chkLogException.Checked)
   config.AppSettings.Settings.Add("EXCEPTION_LOG_FILES_PATH", txtExceptionLogPath.Text);         
config.AppSettings.Settings.Add("DISPLAY_USER_FRIENDLY_MESSAGES", chkUserFrndMsgs.Checked.ToString());
config.Save();