If the type of this column is not Int16, Int32, or Int64 when this property is set, the DataType property is coerced to Int32. An exception is generated if this is a computed column. The Expression property is set. The incremented value is used only if the row's value for this column, when added to the columns collection, is equal to the default value.
You can create a new row using the ItemArray property of the DataRow class and passing in an array of values. This is a potential problem for a column with its AutoIncrement set to true, because its value is generated automatically. To use the ItemArray property, place a null reference (Nothing in Visual Basic) in the column's position in the array. For more information, see the ItemArray property of the DataRow class.
If the type of the column is SqlInt16 or SqlInt32, AutoIncrement will not work. Use Int16 or Int32 instead.
If the type of the column is SqlInt64 or SqlDecimal, AutoIncrement will only partially work. Use Int64 or Decimal instead.
When the AutoIncrementStep value is added to the current value, the overflow check is suppressed.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)