How do I allow the user to multi-check with the CheckedListBox through the 'shift' key?

Question

Say that I have a CheckedListBox with items \"1\", \"2\", \"3\", \"4\", and \"5\" in that order and I want to select \"2\", \"3\", and \"4\" by selecting \"2\" then holding

Answer 1

 private System.Windows.Forms.CheckedListBox LBO1;

 string mySentLst = string.Join(";", LBO1.CheckedItems.Cast());