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private int CountChar(string src, char x)
        {
            int count = 0;

            for (int i = 0; i < src.Length; i++)
            {
                //.ToString().ToUpper(): CaSe sensitive or not
                if (x.ToString().ToUpper() == src[i].ToString().ToUpper()) count++;
            }

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private string CapitalizedString(string input)
        {
            string[] arr = input.Split(' ');
            string result = string.Empty;

            foreach (string a in arr)
            {
                result += a.First().ToString().ToUpper() + a.Substring(1) + " ";
            }
            return result.Trim();

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string str = "Hello World1";
str = str.Remove(str.Length - 1);
//str is now "Hello World"

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string[] arr = ...
List<string> list = new List<string>(arr);

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List<string> names = new List<string>() { "John", "Anna", "Monica" };
var result = String.Join(", ", names.ToArray());

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List<T> noDupes = noDupes.Distinct().ToList();

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private static string ReplaceEx(string original, string pattern, string replacement)
        {
            int count, position0, position1;
            count = position0 = position1 = 0;
            string upperString = original.ToUpper();
            string upperPattern = pattern.ToUpper();
            int inc = (original.Length / pattern.Length) *
                      (replacement.Length - pattern.Length);
            char[] chars = new char[original.Length + Math.Max(0, inc)];
            while ((position1 = upperString.IndexOf(upperPattern,

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        // Example #1 
        // Read the file as one string. 
        string text = System.IO.File.ReadAllText(@"C:\Users\Public\TestFolder\WriteText.txt");

        // Example #2 
        // Read each line of the file into a string array. Each element 
        // of the array is one line of the file. 
        string[] lines = System.IO.File.ReadAllLines(@"C:\Users\Public\TestFolder\WriteLines2.txt");

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// Compose a string that consists of three lines.
string lines = "First line.\r\nSecond line.\r\nThird line.";

// Write the string to a file.
System.IO.StreamWriter file = new System.IO.StreamWriter("c:\\test.txt");
file.WriteLine(lines);

file.Close();

//In order to append an existing file, set the Boolean parameter to true, as follows:

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private string HtmlSrc(string url)
        {
            try
            {
                HttpWebRequest myWebRequest = (HttpWebRequest)WebRequest.Create(url);
                myWebRequest.Timeout = 5000; // Set time out
                myWebRequest.ReadWriteTimeout = 6000; // Set Read Write time out
                myWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1);Accept-Language:vi";
                WebResponse myWebResponse = myWebRequest.GetResponse();
                Stream ReceiveStream = myWebResponse.GetResponseStream();