public SourceColumn(SourceColumn column, bool allowNull) // NOT NULL => NULL
{
Source = column.Source;
SourceColumnName = column.SourceColumnName;
ColumnDbType = column.ColumnDbType;
AllowNull = allowNull;
}
public SourceColumn(SourceColumn column, DbType columnDbType, bool allowNull)
: this(column.Source, column.SourceColumnName, columnDbType, allowNull)
{
}
