string - Simple substring program won't work -


My job tbUnos is a text input and label1 string Let's print the first two letters of the letter I have started learning Visual C ++ and I am trying to understand things.

private: System :: Void textbox 1 tags (System :: Object sender, System :: EventArgs ^ e) { 

  String ^ sUnos = tbUnos - & gt; Text; Label 1- & gt; Text = sUnos-> String :: Substring (1,2);   
}   
 created and run, my program crashed Please help   
 < Div class = "post-text" itemprop = "text"> 
 First of all it is not C ++, it is C ++ / CLI, which is targeting language extension CLI.  
 Second, I do not know how this is done when you do this code  sUnos-> string :: substrings . However, your code should look like this:  
  string ^ sUnos = tbUnos-> Text; If (! String :: IsNullOrEmpty (sUnos)) label 1- & gt; Text = sUnos-> Substrings (1,2);   
 Edit: Notice this code  TextChanged  is the handler for the event means that you press a key every time the keyboard, such as changing text When you type the first letter in the text box, then  tbUnos-> Text will be a letter  and  substring (1, 2)  throws because there is no index to start with 1:  
 
 < example code> Argumentotofrenj Aksposn   
  startIndex  plus  length  is not in this position.

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