C#, .Net Technology

Question: Which of the following is the correct way to sort a C# dictionary by value?
AList<KeyValuePair<string, string>> myList = aDictionary.ToList(); 
myList.Sort( delegate(KeyValuePair<string, string> firstPair, KeyValuePair<string, string> nextPair) { 
return firstPair.Value.CompareTo(nextPair.Value); 
} 
);

BList<KeyValuePair<string, string>> myList = aDictionary.ToList(); 
myList.Sort((firstPair,nextPair) => { return firstPair.Value.CompareTo(nextPair.Value); } );

Cforeach (KeyValuePair<string,int> item in keywordCounts.OrderBy(key=> key.Value)) { 
// do something with item.Key and item.Value 
}

Dvar ordered = dict.OrderBy(x => x.Value);

Note: Not available

Question: Which of the following is the correct code to close all references to the com objects below?Workbooks books = excel.WorkBooks; Workbook book = books[1]; Sheets sheets = book.WorkSheets; Worksheet ws = sheets[1];

Question: Which of the following is the correct way to sort a C# dictionary by value?

Question: Which of the following is the correct code to close all references to the com objects below?
Workbooks books = excel.WorkBooks; Workbook book = books[1]; Sheets sheets = book.WorkSheets; Worksheet ws = sheets[1];