title: C# Text box remaining empty
body: <p>I'm calling a public method from another class. It takes in a List as a parameter, and goes through the list printing out each item into a text field. The problem is the text field is remaining empty!. I've checked that the list is populated by outputing the item to the console before I put it into the text box, and the text is coming up fine there.</p>
  
  <p>The list contains strings, and should output each string to the textfield followed by a semi colon.</p>
  
  <p>This is the method which is being called:</p>
  
  <pre><code>public void fillAttachment(List&lt;string&gt; attachList)
  {
    for (int i = 0; i &lt; attachList.Count; i++)
    {
      Console.WriteLine("List: " + attachList[i]);
      txtAttach.Text += attachList[i] + ";";
    }
  }
  </code></pre>