Sets or returns a string value that names the data member referenced by the DataSource property.
The DataMember property is used to create data-bound controls with the Data
Environment in Visual Basic 6.
It sets or returns a string value that is the name of the data member to be retrieved from
the object specified by the DataSource property.
This name is not case sensitive.
For a full explanation, please refer to the Microsoft documentation on Visual Basic 6.