Gets or sets the name of the column in the System.Data.DataColumnCollection.
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When a System.Data.DataColumn is created, it has no DataColumn.ColumnName value. However, when the System.Data.DataColumn is added to a System.Data.DataColumnCollection for a System.Data.DataTable object, it is given a default name ("Column1", "Column2", and so on).
By default, the DataColumn.Caption value is set to the DataColumn.ColumnName value.