When you pass null as an argument to the Split method, the method tokenizes the string using the comma character as the delimiter.

Name: When you pass null as an argument to the Split method, the method tokenizes the string using the comma character as the delimiter.
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When null is passed as an argument to the Split method, it uses whitespace as the delimiter. If you want to use the comma character as the delimiter, you need to explicitly pass it as an argument, such as Split(',')

When You Pass Null as an Argument to the Split