function CType(
    aStrings: TIdStrings
): StringCollection; overload;

StringCollection - StringCollection for the type conversion.

CType is an overloaded StringCollection function used to perform type conversion for the platform-specific class instance in aStrings. 

CType is available in Visual Studio builds of the Indy library (specifically for VB.Net programs) which do not have access to the implicit conversions in the Borland RTL. 

CType is used to convert the TIdStrings class instance in aStrings to a StringsCollection class instance. 

Use overloaded variants of the method to convert an FCL System.IO.Stream class instance to a native TStream class instance. 

Use overloaded variants of the method to convert a StringCollection class instance to a native TIdStrings class instance.