add ane's for preview 7 and 8 (#4495)

Author: gewarren

xml/System.Windows.Forms/ListView+SelectedIndexCollection.xml

@@ -58,9 +58,7 @@
 |1|3|  
 |2|4|  
   
- You can use the properties and methods of this class to perform a variety of tasks with the collection. The <xref:System.Windows.Forms.ListView.SelectedIndexCollection.Contains%2A> method enables you to determine whether an index position from the <xref:System.Windows.Forms.ListView.ListViewItemCollection> is one of the indexes stored in the <xref:System.Windows.Forms.ListView.SelectedIndexCollection>. Once you know that the item is in the collection, you can use the <xref:System.Windows.Forms.ListView.SelectedIndexCollection.IndexOf%2A> method to determine the position of the index in the <xref:System.Windows.Forms.ListView.SelectedIndexCollection>.  
-  
-   
+ You can use the properties and methods of this class to perform a variety of tasks with the collection. The <xref:System.Windows.Forms.ListView.SelectedIndexCollection.Contains%2A> method enables you to determine whether an index position from the <xref:System.Windows.Forms.ListView.ListViewItemCollection> is one of the indexes stored in the <xref:System.Windows.Forms.ListView.SelectedIndexCollection>. Once you know that the item is in the collection, you can use the <xref:System.Windows.Forms.ListView.SelectedIndexCollection.IndexOf%2A> method to determine the position of the index in the <xref:System.Windows.Forms.ListView.SelectedIndexCollection>.
   
 ## Examples  
  The following code example demonstrates how to use the <xref:System.Windows.Forms.ListView.SelectedIndices%2A>, <xref:System.Windows.Forms.ListView.SelectedIndexChanged>, and <xref:System.Windows.Forms.ListView.HeaderStyle%2A> members and the <xref:System.Windows.Forms.ListView.SelectedIndexCollection> class. To run this example, paste the following code into a form that contains a <xref:System.Windows.Forms.ListView> object named `ListView1` and a <xref:System.Windows.Forms.TextBox> named `TextBox1`. Call the `InitializeListView` method from the form's constructor or <xref:System.Windows.Forms.Form.Load> event handler. This example requires that the event handler is correctly associated with the <xref:System.Windows.Forms.ListView.SelectedIndexChanged> event.  
@@ -111,6 +109,7 @@
   
  ]]></format>
         </remarks>
+        <exception cref="T:System.ArgumentNullException" >.NET 5.0 and later: <paramref name="owner" /> is <see langword="null" />.</exception>
       </Docs>
     </Member>
     <Member MemberName="Add">

xml/System.Windows.Forms/TreeNodeCollection.xml

@@ -726,6 +726,7 @@
   
  ]]></format>
         </remarks>
+        <exception cref="T:System.ArgumentNullException" >.NET 5.0 and later: <paramref name="key" /> is <see langword="null" /> or empty.</exception>
       </Docs>
     </Member>
     <Member MemberName="GetEnumerator">