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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();

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public struct SearchType
    {
        public string url;
        public string title;
        public string content;
        public FindingEngine engine;
        public enum FindingEngine { Google, Bing, GoogleAndBing };
    }

    public interface ISearchResult

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The 3 screen resolutions for your reference are:

WVGA - 480x800 or 800x480 (15:9 ratio)
WXGA - 768x1280 or 1280x768 (15:9 ratio)
720p - 720x1280 or 1280x720 (16:9 ratio)

if(App.Current.Host.Content.ScaleFactor == 100)
  {
    // WVGA
  }

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        private double CalculateConstraintScale(double rotation, int pixelWidth, int pixelHeight)
        {
            double PiDiv180 = Math.PI / 180;
            // Convert angle to radians for the math lib
            double rotationRadians = rotation * PiDiv180;

            // Centre is half the width and height
            double width = pixelWidth / 2.0;

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// Put all file names in root directory into array.
string[] array1 = Directory.GetFiles(@"C:\");

// Put all txt files in root directory into array.
string[] array2 = Directory.GetFiles(@"C:\", "*.TXT"); // <-- Case-insensitive

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MarketplaceReviewTask marketplaceReviewTask = new MarketplaceReviewTask();

marketplaceReviewTask.Show();

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 webBrowser.ScriptErrorsSuppressed = true;

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private void SaveImageClicked(object sender, GestureEventArgs e)
{
    var webClient = new WebClient();
    webClient.OpenReadCompleted += WebClientOpenReadCompleted;
    webClient.OpenReadAsync(new Uri(IMAGE_URL, UriKind.Absolute));
}

void WebClientOpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
    const string tempJpeg = "TempJPEG";