Question

How do you change the text of a button in Windows Phone 7 and C#? NullPointer Exception too, if I am doing the changing of the button text right, what is the problem?

public void CreateWords(Word[] theWords)
{
    listOfWords = new Button[theWords.Length]; //Button Array
    textBlock1.Text = theWords[0].getWord(); //Totally Works
    for (int i = 0; i < theWords.Length; i++)
    {
        listOfWords[i].Content = theWords[0].getWord(); //NullPointer Exception
    }

    for (int i = 0; i < theWords.Length; i++)
    {
        stackWords.Children.Add(listOfWords[i]);
    }
}

Answer 1

You’re getting the NullReferenceException because, while you have created the new Button array, you haven’t initialized any of the elements of that array (each element is still null).