How to store data in memory [closed]

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I am reading data from wordpad one by one which records the sale of grocery item by barcode. I want to store it in memory so that after reading the whole file I can calculate the total number of the same items sold by comparing the bar code.

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Memory. There are several types of memory.

Any variable is a type of memory storage so one answer could be

dim s as string = "hi"

You can also use files as "memory"

Take a look at this

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You should make a class to store your items, then use a List(Of T) to hold instances of the class.