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Find the folder permission of network folders

Find the folder permission of network folders

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using System.Collections.Generic;
using System.Text;
using System.IO;
/*
 * Author				suraj babu malla
 * About				Find the folder permission of network folders
 * created date			19-JAN-2007
 * */
namespace sharedCrapps
{
    class CheckPermission
    {
        public enum PermissionType
        {
            FullAccess,ReadOnly,NoAccess,NoDirectory
        }
        public static PermissionType getPermission(string directoryPath)
        {
            PermissionType permission = new PermissionType();
            DirectoryInfo directInfo = new DirectoryInfo(directoryPath);
                if (!directInfo.Exists)
                    permission=PermissionType.NoDirectory;
                else
                {
                    try
                    {
                        directInfo.GetFiles();
                        try
                        {
                            TextWriter twriter = new StreamWriter(directoryPath + "\\~test.tmp");
                            twriter.WriteLine("test");
                            twriter.Close();
                            try
                            {
                                FileInfo finfo = new FileInfo(directoryPath + "\\~test.tmp");
                                if(finfo.Exists)
                                    finfo.Delete();
                                permission = PermissionType.FullAccess;
                            }
                            catch
                            {
                                permission = PermissionType.FullAccess;  
                            }
                        }
                        catch(Exception)
                        {
                            permission = PermissionType.ReadOnly;
                        }
                    }
                    catch (Exception)
                    {
                        permission=PermissionType.NoAccess;
                    }

                }
                return permission;   
        }
    }
}