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**ShowNullsAs** and **NullValueText** are properties in a Clarion LIST used for NULL column handling.

If the value in the column is null, then the contents of **NullValueText** is displayed (if column data type is a reference type, or if **ShowNullsAs** = **NullValueText**), or an alternate formatted default value (if column data type is a value type and **ShowNullsAs** = **DefaultValue**).

Additionally, there is a **FormatValue** event used to process column information.