One weakness of Visual Basic derived languages such as Visual Basic 6.0 and the VBScript scripting language commonly used to write ASP scripts is that string concatenation is very inefficient.  This inefficiency can be magnified exponentially if concatenation is performed during a looping operation, such as joining together records from an ADO RecordSet.  The inefficiency exists because every time a concatenation is performed a new string object must be created in the memory.  The inefficiencies of string concatenation also affect the .NET Framework.