Refactor DataGridViewColumnCollection to replace ArrayList

src/System.Windows.Forms/src/System/Windows/Forms/DataGridViewColumnCollection.ColumnOrderComparer.cs

@@ -1,34 +1,24 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
-
-#nullable disable
-
-using System.Collections;
 using System.Diagnostics;
 
 namespace System.Windows.Forms
 {
  public partial class DataGridViewColumnCollection
  {
- private class ColumnOrderComparer : IComparer
+ private class ColumnOrderComparer : IComparer<DataGridViewColumn>
  {
  public ColumnOrderComparer()
  {
  }
 
- public int Compare(object x, object y)
+ public int Compare(DataGridViewColumn? x, DataGridViewColumn? y)
  {
  Debug.Assert(x is not null);
  Debug.Assert(y is not null);
 
- DataGridViewColumn dataGridViewColumn1 = x as DataGridViewColumn;
- DataGridViewColumn dataGridViewColumn2 = y as DataGridViewColumn;
-
- Debug.Assert(dataGridViewColumn1 is not null);
- Debug.Assert(dataGridViewColumn2 is not null);
-
- return dataGridViewColumn1.DisplayIndex - dataGridViewColumn2.DisplayIndex;
+ return x.DisplayIndex - y.DisplayIndex;
  }
  }
  }