# C1.Win.TreeView.C1CheckListItemCollection

## Content

<div class="doc-site-dotnet-api-container">



  <h1 id="C1_Win_TreeView_C1CheckListItemCollection" data-uid="C1.Win.TreeView.C1CheckListItemCollection" class="text-break">C1CheckListItemCollection Class
</h1>
  <div class="markdown level0 summary"><p>Represents a collection of <a class="xref" href="C1.Win.TreeView.C1CheckListItem.html">C1CheckListItem</a> objects.</p>
</div>
  <div class="markdown level0 conceptual"></div>
  <div class="inheritance">
    <h5>Inheritance</h5>
    <div class="level0"><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></div>
    <div class="level1"><span class="xref">C1CheckListItemCollection</span></div>
  </div>
  <div class="implements">
    <h5>Implements</h5>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;<a class="xref" href="C1.Win.TreeView.C1CheckListItem.html">C1CheckListItem</a>&gt;</div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.ilist">IList</a></div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.icollection">ICollection</a></div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.ienumerable">IEnumerable</a></div>
    <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.specialized.inotifycollectionchanged">INotifyCollectionChanged</a></div>
  </div>
  <h6><strong>Namespace</strong>: <a class="xref" href="C1.Win.TreeView.html">C1.Win.TreeView</a></h6>
  <h6><strong>Assembly</strong>: C1.Win.TreeView.10.dll</h6>
  <h5 id="C1_Win_TreeView_C1CheckListItemCollection_syntax">Syntax</h5>
  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public class C1CheckListItemCollection : IEnumerable&lt;C1CheckListItem&gt;, IList, ICollection, IEnumerable, INotifyCollectionChanged</code></pre>
  </div>
  <div class="codewrapper">
    <pre><code class="lang-vbnet hljs">Public Class C1CheckListItemCollection
    Implements IEnumerable(Of C1CheckListItem), IList, ICollection, IEnumerable, INotifyCollectionChanged</code></pre>
  </div>
  <h3 id="properties">Properties
</h3>
  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Count" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Count">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Count.html#C1_Win_TreeView_C1CheckListItemCollection_Count">Count</a>
        </td>
        <td class="markdown level1 summary"><p>Gets the number of items contained in the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> instance.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_IsFixedSize" data-uid="C1.Win.TreeView.C1CheckListItemCollection.IsFixedSize">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.IsFixedSize.html#C1_Win_TreeView_C1CheckListItemCollection_IsFixedSize">IsFixedSize</a>
        </td>
        <td class="markdown level1 summary"><p>Gets a value indicating whether the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> instance is fixed size.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_IsReadOnly" data-uid="C1.Win.TreeView.C1CheckListItemCollection.IsReadOnly">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.IsReadOnly.html#C1_Win_TreeView_C1CheckListItemCollection_IsReadOnly">IsReadOnly</a>
        </td>
        <td class="markdown level1 summary"><p>Gets a value indicating whether the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> instance is read-only.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_IsSynchronized" data-uid="C1.Win.TreeView.C1CheckListItemCollection.IsSynchronized">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.IsSynchronized.html#C1_Win_TreeView_C1CheckListItemCollection_IsSynchronized">IsSynchronized</a>
        </td>
        <td class="markdown level1 summary"><p>Gets a value indicating whether the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> instance is synchronized.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Item_System_Int32_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Item(System.Int32)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Item.html#C1_Win_TreeView_C1CheckListItemCollection_Item_System_Int32_">this[int]</a>
        </td>
        <td class="markdown level1 summary"><p>Gets or sets the item at the specified index.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_SyncRoot" data-uid="C1.Win.TreeView.C1CheckListItemCollection.SyncRoot">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.SyncRoot.html#C1_Win_TreeView_C1CheckListItemCollection_SyncRoot">SyncRoot</a>
        </td>
        <td class="markdown level1 summary"><p>Gets the synchronize root.</p>
</td>
      </tr>
    </tbody>
  </table>
  <h3 id="methods">Methods
</h3>
  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Add_C1_Win_TreeView_C1CheckListItem_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Add(C1.Win.TreeView.C1CheckListItem)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Add.html#C1_Win_TreeView_C1CheckListItemCollection_Add_C1_Win_TreeView_C1CheckListItem_">Add(C1CheckListItem)</a>
        </td>
        <td class="markdown level1 summary"><p>Adds an item to the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a>.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Add_System_Object_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Add(System.Object)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Add.html#C1_Win_TreeView_C1CheckListItemCollection_Add_System_Object_">Add(object)</a>
        </td>
        <td class="markdown level1 summary"><p>Adds an item to the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a>.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_AddRange_System_Collections_Generic_IEnumerable_C1_Win_TreeView_C1CheckListItem__" data-uid="C1.Win.TreeView.C1CheckListItemCollection.AddRange(System.Collections.Generic.IEnumerable{C1.Win.TreeView.C1CheckListItem})">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.AddRange.html#C1_Win_TreeView_C1CheckListItemCollection_AddRange_System_Collections_Generic_IEnumerable_C1_Win_TreeView_C1CheckListItem__">AddRange(IEnumerable&lt;C1CheckListItem&gt;)</a>
        </td>
        <td class="markdown level1 summary"><p>Adds the items of the specified collection to the end of the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a>.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_AddRange_System_Collections_IEnumerable_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.AddRange(System.Collections.IEnumerable)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.AddRange.html#C1_Win_TreeView_C1CheckListItemCollection_AddRange_System_Collections_IEnumerable_">AddRange(IEnumerable)</a>
        </td>
        <td class="markdown level1 summary"><p>Adds the items of the specified collection to the end of the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a>.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Clear" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Clear">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Clear.html#C1_Win_TreeView_C1CheckListItemCollection_Clear">Clear()</a>
        </td>
        <td class="markdown level1 summary"><p>Removes all items from the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a>.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Contains_C1_Win_TreeView_C1CheckListItem_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Contains(C1.Win.TreeView.C1CheckListItem)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Contains.html#C1_Win_TreeView_C1CheckListItemCollection_Contains_C1_Win_TreeView_C1CheckListItem_">Contains(C1CheckListItem)</a>
        </td>
        <td class="markdown level1 summary"><p>Determines whether an item is in the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a>.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Contains_System_Object_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Contains(System.Object)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Contains.html#C1_Win_TreeView_C1CheckListItemCollection_Contains_System_Object_">Contains(object)</a>
        </td>
        <td class="markdown level1 summary"><p>Determines whether an item is in the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a>.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_CopyTo_C1_Win_TreeView_C1CheckListItem___System_Int32_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.CopyTo(C1.Win.TreeView.C1CheckListItem[],System.Int32)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.CopyTo.html#C1_Win_TreeView_C1CheckListItemCollection_CopyTo_C1_Win_TreeView_C1CheckListItem___System_Int32_">CopyTo(C1CheckListItem[], int)</a>
        </td>
        <td class="markdown level1 summary"><p>Copies the entire <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> to a compatible one-dimensional array, starting at the specified index of the target array.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_CopyTo_System_Array_System_Int32_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.CopyTo(System.Array,System.Int32)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.CopyTo.html#C1_Win_TreeView_C1CheckListItemCollection_CopyTo_System_Array_System_Int32_">CopyTo(Array, int)</a>
        </td>
        <td class="markdown level1 summary"><p>Copies the entire <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> to a compatible one-dimensional array, starting at the specified index of the target array.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_GetEnumerator" data-uid="C1.Win.TreeView.C1CheckListItemCollection.GetEnumerator">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.GetEnumerator.html#C1_Win_TreeView_C1CheckListItemCollection_GetEnumerator">GetEnumerator()</a>
        </td>
        <td class="markdown level1 summary"><p>Returns an enumerator that iterates through the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a>.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_IndexOf_C1_Win_TreeView_C1CheckListItem_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.IndexOf(C1.Win.TreeView.C1CheckListItem)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.IndexOf.html#C1_Win_TreeView_C1CheckListItemCollection_IndexOf_C1_Win_TreeView_C1CheckListItem_">IndexOf(C1CheckListItem)</a>
        </td>
        <td class="markdown level1 summary"><p>Searches for the specified item and returns the zero-based index.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_IndexOf_System_Object_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.IndexOf(System.Object)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.IndexOf.html#C1_Win_TreeView_C1CheckListItemCollection_IndexOf_System_Object_">IndexOf(object)</a>
        </td>
        <td class="markdown level1 summary"><p>Searches for the specified item and returns the zero-based index.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Insert_System_Int32_C1_Win_TreeView_C1CheckListItem_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Insert(System.Int32,C1.Win.TreeView.C1CheckListItem)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Insert.html#C1_Win_TreeView_C1CheckListItemCollection_Insert_System_Int32_C1_Win_TreeView_C1CheckListItem_">Insert(int, C1CheckListItem)</a>
        </td>
        <td class="markdown level1 summary"><p>Inserts item into the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> at the specified index.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Insert_System_Int32_System_Object_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Insert(System.Int32,System.Object)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Insert.html#C1_Win_TreeView_C1CheckListItemCollection_Insert_System_Int32_System_Object_">Insert(int, object)</a>
        </td>
        <td class="markdown level1 summary"><p>Inserts item into the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> at the specified index.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_OnCollectionChanged_System_Collections_Specialized_NotifyCollectionChangedEventArgs_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.OnCollectionChanged.html#C1_Win_TreeView_C1CheckListItemCollection_OnCollectionChanged_System_Collections_Specialized_NotifyCollectionChangedEventArgs_">OnCollectionChanged(NotifyCollectionChangedEventArgs)</a>
        </td>
        <td class="markdown level1 summary"><p>Raise CollectionChanged event to any listeners.
Properties/methods modifying this <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> will raise
a collection changed event through this virtual method.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Remove_C1_Win_TreeView_C1CheckListItem_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Remove(C1.Win.TreeView.C1CheckListItem)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Remove.html#C1_Win_TreeView_C1CheckListItemCollection_Remove_C1_Win_TreeView_C1CheckListItem_">Remove(C1CheckListItem)</a>
        </td>
        <td class="markdown level1 summary"><p>Removes the first occurrence of a specified item from the collection.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_Remove_System_Object_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.Remove(System.Object)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.Remove.html#C1_Win_TreeView_C1CheckListItemCollection_Remove_System_Object_">Remove(object)</a>
        </td>
        <td class="markdown level1 summary"><p>Removes the first occurrence of a specified item from the collection.</p>
</td>
      </tr>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_RemoveAt_System_Int32_" data-uid="C1.Win.TreeView.C1CheckListItemCollection.RemoveAt(System.Int32)">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.RemoveAt.html#C1_Win_TreeView_C1CheckListItemCollection_RemoveAt_System_Int32_">RemoveAt(int)</a>
        </td>
        <td class="markdown level1 summary"><p>Removes the item at the specified index of the collection.</p>
</td>
      </tr>
    </tbody>
  </table>
  <h3 id="events">Events
</h3>
  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td id="C1_Win_TreeView_C1CheckListItemCollection_CollectionChanged" data-uid="C1.Win.TreeView.C1CheckListItemCollection.CollectionChanged">
          <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.CollectionChanged.html">CollectionChanged</a>
        </td>
        <td class="markdown level1 summary"><p>Occurs when the <a class="xref" href="C1.Win.TreeView.C1CheckListItemCollection.html">C1CheckListItemCollection</a> changes, either by adding or removing an item.</p>
</td>
      </tr>
    </tbody>
  </table>

</div>
