c# - why nothing shows up in my output file, it comes out to be blank? -

using system; using system.collections.generic; using system.linq; using system.text; using system.text.regularexpressions; using system.io;  namespace wordfreq {     class program     {         static void main(string[] args)         {             string fullreview = file.readalltext("c:\\reviews.txt").tolower();             string[] stripchars = { ";", ",", ".", "-", "_", "^", "(", ")", "[", "]",                                     "0", "1", "2", "3", "4", "5", "6", "7", "8",                                     "9", "\n", "\t", "\r","<",">" };             foreach (string character in stripchars)             {                 fullreview = fullreview.replace(character, "");             }              // split on spaces list of strings             list<string> wordlist = fullreview.split(' ').tolist();              // define , remove stopwords             string[] stopwords = new string[] {"a", "about", "above", "after", "again",                                                "against", "all", "am", "an", "and", "any",                                                "are", "aren't", "as","at", "be", "because",                                                "been", "before", "being", "below", "between",                                                "both", "but", "by", "can't", "cannot",                                                "could", "couldn't", "did", "didn't", "do",                                                "does", "doesn't", "doing", "don't", "down",                                                "during", "each", "few", "for", "from",                                                "further", "had", "hadn't", "has", "hasn't",                                                "have", "haven't", "having", "he", "he'd",                                                "he'll", "he's", "her", "here", "here's",                                                "hers", "herself", "him", "himself", "his",                                                "how", "how's", "i", "i'd", "i'll", "i'm",                                                "i've", "if", "in", "into", "is", "isn't",                                                "it", "it's", "its", "itself", "let's",                                                "me", "more", "most", "mustn't", "my",                                                "myself", "no", "nor", "not", "of", "off",                                                "on", "once", "only", "or", "other", "ought",                                                "our", "ours ", " ourselves", "out", "over",                                                "own", "same", "shan't", "she", "she'd",                                                "she'll", "she's", "should", "shouldn't", "so",                                                "some", "such", "than", "that", "that's",                                                "the", "their", "theirs", "them", "themselves",                                                "then", "there", "there's", "these", "they",                                                "they'd", "they'll", "they're", "they've",                                                "this", "those", "through", "to", "too",                                                "under", "until", "up", "very", "was",                                                "wasn't", "we", "we'd", "we'll", "we're",                                                "we've", "were", "weren't", "what", "what's",                                                "when", "when's", "where", "where's",                                                "which", "while", "who", "who's", "whom",                                                "why", "why's", "with", "won't", "would",                                                "wouldn't", "you", "you'd", "you'll", "you're",                                                 "you've", "your", "yours", "yourself",                                                "yourselves" };             foreach (string word in stopwords)             {                 // while there's still instance of stopword in wordlist, remove it.                 // if don't use while loop on each call remove removes single                 // instance of stopword our wordlist, , can't call replace on                 // entire string (as opposed individual words in string) it's                 // indiscriminate (i.e. removing 'and' turn words 'bandage' 'bdage'!)                 while (wordlist.contains(word))                 {                     wordlist.remove(word);                 }             }              // create new dictionary object             dictionary<string, int> dictionary = new dictionary<string, int>();              // loop on over words in our wordlist...             foreach (string word in wordlist)             {                 // if length of word @ least 3 letters...                 if (word.length >= 2)                 {                     // ...check if dictionary has word.                     if (dictionary.containskey(word))                     {                         // if have word in dictionary, increment count of how many times appears                         dictionary[word]++;                     }                     else                     {                         // otherwise, if it's new word add dictionary initial count of 1                         dictionary[word] = 1;                     }                 } // end of word length check             } // end of loop on each word in our input              // create dictionary sorted value (i.e. how many times word occurs)             var sorteddict = (from entry                                  in dictionary                             orderby entry.value descending                              select entry).todictionary(keyvaluepair => keyvaluepair.key,                                                        keyvaluepair => keyvaluepair.value);              // loop through sorted dictionary , output top 10 occurring words             int count = 1;             console.writeline("---- frequent terms in file: " +fullreview+ " ----");             console.writeline();              foreach (keyvaluepair<string, int> keyvaluepair in sorteddict)             {                 // output occurring words , associated word counts                 console.writeline(count + "\t" + keyvaluepair.key + "\t" + keyvaluepair.value);                 count++;                  // display top 10 words break out of loop!             }              using (streamwriter streamwrite = new streamwriter("c:\\output.txt"))             foreach (keyvaluepair<string, int> keyvaluepair in dictionary)             {                 streamwrite.writeline("{0}:{1}", keyvaluepair.key, keyvaluepair.value);             }              // wait user press key before exiting         } // end of main method     } // end of program class } // end of namespace 

first please take @ links remus suggested in comments.

secondly, code should work, thing that's wrong here you're trying write directly onto c:\. try place under directory such c:\temp\ , should go.

take here more info why happens.