public static int GetErrorCount(this ErrorProvider ep)
{
var controls = ep.GetOrSetAttached(() => new HashSet <Control>()).Value;
var errControls = from c in controls
let err = ep.GetError(c)
let hasErr = !string.IsNullOrEmpty(err)
where hasErr
select c;
var errCount = errControls.Count();
return(errCount);
}
public static void TrackControl(this ErrorProvider ep, Control c)
{
var controls = ep.GetOrSetAttached(() => new HashSet <Control>()).Value;
controls.Add(c);
}