/// <summary>
/// Clears the ValidationError that was set through a call
/// to MarkInvalid or a previously failed validation of that BindingExpression.
/// </summary>
public static void ClearInvalid(BindingExpressionBase bindingExpression)
{
if (bindingExpression == null)
throw new ArgumentNullException("bindingExpression");
bindingExpression.UpdateValidationError(null);
}
/// <summary>
/// Mark this BindingExpression as invalid. If the BindingExpression has been
/// explicitly marked invalid in this way, then it will remain
/// invalid until ClearInvalid is called or another transfer to the source validates successfully.
/// </summary>
public static void MarkInvalid(BindingExpressionBase bindingExpression, ValidationError validationError)
{
if (bindingExpression == null)
throw new ArgumentNullException("bindingExpression");
if (validationError == null)
throw new ArgumentNullException("validationError");
bindingExpression.UpdateValidationError(validationError);
}