Compare two generic List using linq or lambda

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C#

class myFile{

public filename
public filedate

}

List<myfile> source = new List<<myfile>();
add files..
<list><myfile> target = new List<myfile>();
add files..</myfile></myfile></list></myfile></myfile>

Compare the list and return
1) List of files unique to source list
2) List of files unique to target list
3) List of source files where target date is diffrent

I can do this with three foreach statements
but is there an easy way using linq or Lambda expression?