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DataTable dt1 = GetDataTable(students); DataTable newTable = dt1.AsEnumerable().CopyToDataTable(); There is little new so far. We created what will be our source DataTable from the students array. We created our destination DataTable by calling the CopyToDataTable operator on the source DataTable. Notice that because we called the first prototype of the CopyToDataTable operator, we do not need to call the AcceptChanges method on the destination DataTable. This is important because, in the next segment of code, we reference the original version of the Name field. If it were not for the fact that the first prototype of the CopyToDataTable operator establishes the original versions of fields for you, an exception will be thrown since the original version would not exist. Console.WriteLine("Before upserting DataTable:"); foreach (DataRow dataRow in newTable.AsEnumerable()) { Console.WriteLine("Student Id = {0} : original {1} : current {2}", dataRow.Field<int>("Id"), dataRow.Field<string>("Name", DataRowVersion.Original), dataRow.Field<string>("Name", DataRowVersion.Current)); } There is nothing of significance here except that we reference the original version of the Name field in the record, and no exception is thrown when doing so because this prototype of the CopyToDataTable operator established the original version for me. (from s in dt1.AsEnumerable() where s.Field<string>("Name") == "Anthony Adams" select s).Single<DataRow>().SetField("Name", "George Oscar Bluth"); dt1.AsEnumerable().CopyToDataTable(newTable, LoadOption.Upsert); This is the important segment of this example. Notice that we change the value of the Name field for one of the records in the source DataTable using the SetField<T> operator. Next, we call the CopyToDataTable operator specifying that a LoadOption.Upsert type of copy should occur, meaning update only the current version. This causes a problem, though, in that since we have called the second CopyToDataTable operator prototype, which doesn t establish original versions for records inserted into the database and we haven t called the AcceptChanges method, if we attempt to access the original

Locate Form ClientId The _findFormClientId method is used in the encodeChildren() method to return the clientId of the closest enclosing UIForm component, as shown in Code Sample 3-26. Code Sample 3-26. The _findFormClientId Method private String _findFormClientId( FacesContext context, UIComponent component) { while (component != null && !(component instanceof UIForm)) { component = component.getParent(); } return (component != null) component.getClientId(context) : null; } In the _findFormClientId() method, you first check whether the component is an instance of UIForm; if it is not, you walk the component hierarchy to find the parent UIForm component by calling component.getParent(). When you have the parent UIForm component, you return the clientId. If not, you return null. Encode Children In the encodeChildren() method, you call the method _encodeAll() to render the header facet and each of the active UIShowItem s child components, as shown in Code Sample 3-27. This method takes two arguments the FacesContext for the current request and the UIComponent to render. Code Sample 3-27. The _encodeAll() Method /** * Encodes a component and all of its children. * * @param context the Faces context * @param component the Faces component * * @throws IOException if an I/O error occurs during rendering */ private void _encodeAll( FacesContext context, UIComponent component) throws IOException { component.encodeBegin(context); if (component.getRendersChildren())

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You will see that in many of the LINQ to SQL examples in this chapter and the subsequent LINQ to SQL chapters, I work with sequences of type IQueryable<T>, where T is the type of an entity class. These are the type of sequences that are typically returned by LINQ to SQL queries. They will often appear to work just like an IEnumerable<T> sequence, and that is no coincidence. The IQueryable<T> interface implements the IEnumerable<T> interface. Here is the definition of IQueryable<T>: interface IQueryable<T> : IEnumerable<T>, IQueryable Because of this inheritance, you can treat an IQueryable<T> sequence like an IEnumerable<T> sequence.

versions on inserted records, an exception will be thrown We will have to use the HasVersion method to prevent this from happening if any records are inserted Since we have not specified any primary keys, we know that all the records in the source table will be inserted into the destination table ConsoleWriteLine("{0}After upserting DataTable:", SystemEnvironmentNewLine); foreach (DataRow dataRow in newTableAsEnumerable()) { ConsoleWriteLine("Student Id = {0} : original {1} : current {2}", dataRowField<int>("Id"), dataRowHasVersion(DataRowVersionOriginal) dataRowField<string>("Name", DataRowVersionOriginal) : "-does not exist-", dataRowField<string>("Name", DataRowVersionCurrent)); } In this code segment, we merely display the DataTable content to the console.

Now, the interesting thing about this example is that since we do not specify any primary keys for the destination table, when the copy occurs, no records will be deemed the same, so all the copied records from the source DataTable will be appended to the destination DataTable Also, notice that we only access the original version of the field s data if the HasVersion method returns true indicating that there is an original version.

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