title: listbox selected items in winform
body: <p>I have listbox, button, and textbox controls in a Windows application. How can I display multiple selected values in a textbox.</p>
  
  <p>this is my code </p>
  
  <pre><code>textBox1.Text = listBox1.SelectedItems.ToString();
  </code></pre>
  
  <p>but it display in textbox like this: (I select more than one item)</p>
  
  <pre><code>System.Windows.Forms.ListBox+Selec. 
  </code></pre>
  
  <p>please help me</p>