/// <summary>
/// Negates the invocation expression.
/// </summary>
/// <param name="factory">
/// The factory.
/// </param>
/// <param name="invocationExpression">
/// The invocation expression.
/// </param>
private static void NegateInvocationExpression(CSharpElementFactory factory, IInvocationExpression invocationExpression)
{
var expression = factory.CreateExpression("!" + invocationExpression.GetText());
invocationExpression.ReplaceBy(expression);
}