How to set permission on folder in c#?

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C#

C#4.0

Hello,

I am developing a window application in c#.net. I want to make my folder lock. Folder can't be delete, open, copy and paste. Only I want to insert the images in folder by pragmatically and retrieve those images.

This is my code. Using this, I am only able to insert the images and also can't delete the folder but when I am going to move this folder in some other folder that can be move and after moving the folder all rights are removed.

How to do this ? Please help me out.

private void Permissionbtn_Click_1(object sender, EventArgs e)
{
           DirectoryInfo myDirectoryInfo = new DirectoryInfo(textBox1.Text);          
           DirectorySecurity myDirectorySecurity = myDirectoryInfo.GetAccessControl();
           string User = System.Environment.UserDomainName + "\\" +                                                     comboBox1.SelectedItem.ToString();
           myDirectorySecurity.AddAccessRule(new FileSystemAccessRule(User,                                     FileSystemRights.ListDirectory, AccessControlType.Deny));
}