[Mono-dev] DataColumn.DefaultValue fixes

[Atsushi Eno]

Hello,

I have a fix for one of failing sys.data test in 2.0 profile. Here
is description (could be used for ChangeLog):

* System.Data/DataColumn.cs
  DefaultValue can be non-DBNull. For SqlXxx type, it becomes
  SqlXxx.Null. Also, changing DataType may change DefaultValue
  to be consistent with the new type (say, having int DefaultValue
  for new string DataType is wrong).

* System.Data/XmlSchemaWriter.cs
  This should be fixed to take non-DBNull default value into
  consideration.

* Test/System.Data/DataTableTest.cs, Test/System.Data/DataSetTest.cs
  We could use default value as is, not in string form. This makes
  comparison more strict.

* Test/System.Data/DataColumnTest.cs
  Added test for non-DBNull case and changing DataType case.

If it looks good, I'll check in it later.

Atsushi Eno

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