Check all checkboxes on the page wity JQuery

javascript:$("input[type=checkbox]").attr('checked', true);

C# Runtime objects comparison (find differences)

Put the following code to Immediate Window (Ctrl + Alt + I)

// Create StringWriter
System.IO.StringWriter stringWriter = new System.IO.StringWriter();

// Serialize object to the stringWriter.
new System.Xml.Serialization.XmlSerializer(obj.GetType()).Serialize(stringWriter, obj);

// Get serialized output.
stringWriter.ToString();

After you get xml strings for the serialized objs, that you wanted to compare you can easily compare this string in Araxis Merge or WinDiff tools.