https://learn.microsoft.com/en-us/dotnet/api/system.collections.specialized.nameobjectcollectionbase.baseadd?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
NameObjectCollectionBase.BaseAdd(String, Object) Method (System.Collections.Specialized) |...
Adds an entry with the specified key and value into the NameObjectCollectionBase instance.
stringobjectmethodsystemcollections