https://learn.microsoft.com/en-us/dotnet/api/system.collections.specialized.nameobjectcollectionbase.baseremoveat?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
NameObjectCollectionBase.BaseRemoveAt(Int32) Method (System.Collections.Specialized) | Microsoft...
Removes the entry at the specified index of the NameObjectCollectionBase instance.
methodsystemcollectionsspecializedmicrosoft