title: Prevent Paste strings into Combo Box which are not items of that Combo Box in C#
body: <p>I'm using C# win forms and I need to prevent paste into a combo box in that.(Prevent only if pasting string not in the drop down item list). If pasting string is a item in drop down list user should allow to paste it.
  I already prevent user attempt to enter non existing items.Below the code is provided</p>
  
  <pre><code>     private void listLocation_KeyPress(object sender, KeyPressEventArgs e)
       {
          if (Char.IsControl(e.KeyChar))
          {
              return;
          }
          ComboBox box = ((ComboBox)sender);
  
          string nonSelected = box.Text.Substring(0, box.Text.Length - box.SelectionLength);
  
          string text = nonSelected + e.KeyChar;
          bool matched = false;
          for (int i = 0; i &lt; box.Items.Count; i++)
          {
              if (((DataRowView)box.Items[i])[box.DisplayMember].ToString().StartsWith(text, true, null))
              {
                  matched = true;
                  break;
              }
          }
          e.Handled = !matched;
      }
  </code></pre>