Parameters
- item
- The object to locate in the page collection.
Return Value
The index of item if found in the list; otherwise, -1.
If an object occurs multiple times in the list, the IndexOf method always returns the first instance found.
Target Platforms: .NET9; .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5