System.NuReferenceException: 'Object was set with an object made.' how to fix?

Question

string metinok;
metinok = mainwindowtest.Text;
int konumok = -1;
string kelimeok = "=>";

            konumok = metinok.IndexOf(kelimeok, konumok + 1);
            mainwindowtest.Focus();
            if (konumok != -1)
            {
                if (runGame == true)
                {
                }
            }

I do not know what to say. it wasn't just being young, now this error pops up (in the title)

Answer 1

The reason for the problem is here:

        public MainWindow()  
        {  
            ZaugLanguage();  
            InitializeComponent();  
        }  

We need to put the InitializeComponent method above the ZaugLanguage method.

We can know from the name that this method is used to initialize the component. If the component has not been initialized, then of course a NuReferenceException will appear when we try to call it.

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