R – Checkbox not appearing in Winform GridView

I came to the conclusion that what I wanted to do couldn't be done by using the DataGridView.DataSource property. In the end, I used for loops to manually add columns and rows to the DataGridView.

You have to define the Read, Write, Modify, etc. columns of your DataGridView of type DataGridViewCheckBoxColumn. Then, when you read the permissions for each group, you can get the corresponding boolean values for each permission and create the row with these values:

foreach (FileSystemAccessRule fileSystemAccessRule in folderSecurity.GetAccessRules(true, true, typeof(System.Security.Principal.NTAccount)))
{
    string IdentityReference = fileSystemAccessRule.IdentityReference.ToString();

    AccessControlType accessControlType = fileSystemAccessRule.AccessControlType;
    FileSystemRights filesystemrights = fileSystemAccessRule.FileSystemRights;
    bool isInherited = fileSystemAccessRule.IsInherited;

    // .. Get specific permissions ...

    bool allowControlType = accessControlType == AccessControlType.Allow;
    bool canRead = (filesystemrights & FileSystemRights.Read) == FileSystemRights.Read;
    bool canWrite = (filesystemrights & FileSystemRights.Write) == FileSystemRights.Write;
    bool canExecute = (filesystemrights & FileSystemRights.ExecuteFile) == FileSystemRights.ExecuteFile;

    // ... Any more specific permissions ...

    dataGridView1.Rows.Add(IdentityReference, allowControlType, canRead, canWrite, canExecute, ... );
}

That way your DataGridView will have the Group Name in the first cell (as a TextBox) and a CheckBox for each specific permission, like:

Everyone                    (check)      (check)     (no check)   (no check)
BUILTIN\Administrators      (check)      (check)     (check)      (check)
BUILTIN\Users               (check)      (check)     (check)      (no check)

and so on...