Question

I’m new windows phone, I want to create a textbox one by one inside the grid using for loop dynamically. and i want to access the textboxes using their names to perform some calculations. my code is shown below:

 public MainPage()
    {
        InitializeComponent();
        string[] str = new string[2];
        str[0] = "force";
        str[1] = "force components";
        TextBox[] textbox = new TextBox[2];

       for (int i =0; i <2; i++)
       {
           textbox[i].Text = str[i]; 

            ContentPanel.Children.Add(textbox[i]);
        }
    }

the above code shows null reference exception in the line “textbox[i].Text = str[i]”.
please, show me the code for clearing this issue. help me. Thank You..

Answer 1

I’m not entirely convinced you’re doing this the right way*, but in the absense of any better information I’ll directly answer your question…
You’re not declaring a new TextBox for each iteration of the loop. Try this…

for (int i =0; i <2; i++)
{
    textbox[i]= new TextBox { Text = str[i] } ; 
    ContentPanel.Children.Add(textbox[i]);
}

* Binding to an ItemsControl of some sort would probably be preferable…