Iterate enumerable object while debugging in Visual Studio

this.Page.Validate();
if (!this.Page.IsValid())
{
  // breakpoint here
}

pages.Where((x) =>
 {
    if (x.IsValid)
    {
        Debugger.Break();
        return true;
    }
    return false;
 });

[Conditional("DEBUG")]
static bool BreakpointPredicate(YourItemType x)
{
    if (x.IsValid)
    {
        Debugger.Break()
        return true;
    }
    return false;
}

pages.Where(BreakPointPredicate);