Text file writing in c#

Question

I want to write a text file in c#... but it is giving error

 

Access to the path 'C:\Program Files(x86)\Anil\demoSettings.txt' is denied.

string executableLocation = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
string FileName = Path.Combine(executableLocation, "demoSettings.txt");
var permissionSet = new PermissionSet(PermissionState.None);
var writePermission = new FileIOPermission(FileIOPermissionAccess.Write, FileName);
permissionSet.AddPermission(writePermission);
if (permissionSet.IsSubsetOf(AppDomain.CurrentDomain.PermissionSet))
{
using (FileStream fstream = new FileStream(FileName, FileMode.Create))
using (TextWriter sw = new StreamWriter(fstream))
{
sw.WriteLine("Name," + "Anil");
sw.WriteLine("Code," + "C#");
}
}

how to fix this ??? can anyone help me out???