Answer / Pawan Kumar Gupta

To sort items in a ListBox in WPF, you need to implement the IComparer interface and set it as the SortDescriptions collection's Comparer property on your ItemsControl. Here is an example of how to do that:

```csharp
public class MyClass : IComparer<MyItem>
{
public int Compare(MyItem x, MyItem y)
{
// Compare based on a property of the item
return x.PropertyName.CompareTo(y.PropertyName);
}
}

// Later in your XAML:
<ListBox ItemsSource="{Binding MyItems}">
<ListBox.Resources>
<local:MyClass x:Key="comparer" />
</ListBox.Resources>
<ListBox.SortDescriptions>
<SortDescription SortMemberPath="PropertyName" Comparer="{StaticResource comparer}" />
</ListBox.SortDescriptions>
</ListBox>

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