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

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

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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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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 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";

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 webBrowser.ScriptErrorsSuppressed = true;

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MarketplaceReviewTask marketplaceReviewTask = new MarketplaceReviewTask();

marketplaceReviewTask.Show();

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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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        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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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
  }