Why it does not jump into if sentence? C# #UWP

Question

I have this HangMan game and i got problems. When user clicks on alphabet button, it wont jump into that if-sentence which i got in my code. "Current" variable is a string and the button content is a letter and i want to know if that guessing word contains that letter, which user clicks on. Even if i debug that code, i don't get the "current" variable(guessing word)in that Guessing method. Thanks for all!

    public sealed partial class Hangman : Page
{
    private string[] words;
    private int WrongGuesses = 0;
    private string copyCurrent;
    private string current;
    public Hangman()
    {
        InitializeComponent();
        loadWords();
        DisplayTheWord();
        Hangman_OnLoaded();
    }

    private void loadWords()
    {
        string[] ReadWords = File.ReadAllLines("EnglishWords.txt");
        words = new string[ReadWords.Length];
    }
    private string[] images =
    {
        "/Assets/hang1.png", "/Assets/hang2.png", "/Assets/hang3.png",
        "/Assets/hang4.png", "/Assets/hang5.png"
    };

    public void PlayAgain_OnClick(object sender, RoutedEventArgs e)
    {
        WrongGuesses = 0;
        BitmapImage Hangman2 = new BitmapImage();
        Uri URL = new Uri(BaseUri, images[WrongGuesses]);
        Hangman2.UriSource = URL;
        picture.Source = Hangman2;
        string[] ReadWords = File.ReadAllLines("EnglishWords.txt");
        int NextNumber = new Random().Next(words.Length);
        copyCurrent = "";
        for (int i = 0; i < ReadWords[NextNumber].Length; i++)
        {
            copyCurrent += "_" + "   ";
        }
        CopiedWord.Text = copyCurrent;
    }

    public void DisplayTheWord()
    {
        WrongGuesses = 0;
        BitmapImage Hangman2 = new BitmapImage();
        Uri URL = new Uri(BaseUri, images[WrongGuesses]);
        Hangman2.UriSource = URL;
        picture.Source = Hangman2;
        string[] ReadWords = File.ReadAllLines("EnglishWords.txt");   
        int NextNumber = new Random().Next(words.Length);             
        copyCurrent = ""; 
        current = ReadWords[NextNumber];                          

        for (int i = 0; i < ReadWords[NextNumber].Length; i++)
        {
            copyCurrent += "_" + "   ";                            
        }
        CopiedWord.Text = copyCurrent;                            
    }
    public void Hangman_OnLoaded()
    {
        const int btnSize = 35;                                  
        var c = 0;                                               
        for (var i = 65; i <= 90; i++)                           
        {
            var btn = new Button {                              
                Content = (char) i,                              
            };                                                    
            btn.Width = btn.Height = btnSize;                    
            var margin = btn.Margin;                              
            margin.Left = c += 37;                                
            btn.Margin = margin;                                 
            GridMain.Children.Add(btn);                          
            btn.Click += Guessing;                               
        }

    }
    private void Guessing(object sender, RoutedEventArgs e)
    {
        Button choice = sender as Button;
        var ltr = choice.Content.ToString();
        if (current.Contains(ltr))                              // it wont jump into this if sentence                 
        {
                char[] temp = copyCurrent.ToCharArray();           
                char[] find = current.ToCharArray();               
                char guessChar = ltr.ElementAt(0);                 
            for (int index = 0; index < find.Length; index++)      
                {                                                  
                    if (find[index]== guessChar)                   
                    {                                              
                        temp[index] = guessChar;                   
                    }                                              
                }                                                  
                copyCurrent = new string(temp);                   
            }
            else
            {
                WrongGuesses++;                                    
            }
            if (WrongGuesses < 6)
            {
                //picture.Source = muudab pilti
            }

Answer 1

Why it does not jump into if sentence?

No jump is because your current variable is null or it doesn't contain the Itr you give.

I get the value of ltr, but i don't get the current value

I have tested your code about getting current value and there is nothing wrong with the code itself. But current is a string that got from a random line from EnglishWords.txt, if the random line has no content, it will contain nothing. So please check the text file if it has blank lines and the result of current = ReadWords[NextNumber];.