Programming in objective c

The purpose of this study is to expand the understanding of IT student retention in Taiwan. Three objectives are proposed: (a) to identify at-risk students who are most likely to drop out; (b) to model Information System (IS) student retention; and (c) to inform intervention programs for at-risk students. The significance of this study is in serving to better inform faculties, staff and administrators of higher education institutions in turn to help strengthen the retention of IT students.

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EURASIP Journal on Applied Signal Processing 2003:8, 841–859 c 2003 Hindawi Publishing Corporation A Domain-Independent Window Approach to Multiclass Object Detection Using Genetic Programming Mengjie Zhang School of Mathematical and Computing Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand Email: mengjie@mcs.vuw.ac.nz Victor B. Ciesielski School of Computer Science and Information Technology, RMIT University, GPO Box 2476v Melbourne, 3001 Victoria, Australia Email: vc@cs.rmit.edu.

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Writing and Reading XML Using a DataSet Object XML is a convenient format for moving information around. You can write out the contents of the DataTable objects contained in a DataSet to an XML file using the WriteXml() method

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Using the Default Sort Algorithm If you want to sort the DataRowView objects in your DataView based on the primary key of your DataTable, you can use a shortcut. Instead of setting the Sort property of your DataView

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Using a DataReader Object in Visual Studio .NET You can't visually create a DataReader object in Visual Studio .NET (VS .NET); you can only create them using program statements.

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The UniqueConstraint Class You use an object of the UniqueConstraint class to ensure that a DataColumn value, or combination of DataColumn values, is unique for each DataRow in a DataTable.

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The SqlDataAdapter Class You use an object of the SqlDataAdapter class to synchronize data stored in a DataSet object with a SQL Server database

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The DataViewManager Class A DataViewManager allows you to centrally manage multiple DataView objects in a DataSet. A DataViewManager also allows you to create DataView objects on the fly at runtime

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The DataTable Class You use an object of the DataTable class to represent a table. You can also store multiple DataTable objects in a DataSet. Table 11.1 shows some of the DataTable properties.

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The DataSet Class You use an object of the DataSet class to represent a local copy of the information stored in the database.

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The DataRowView Class Rows in a DataView object are stored as objects of the DataRowView class.

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The DataColumn Class You use an object of the DataColumn class to represent a column. You can also store multiple DataColumn objects in a DataRow.

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The DataRow Class You use an object of the DataRow class to represent a row. You can also store multiple DataRow objects in a DataTable. Table 11.4 shows some of the DataRow properties.

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Nested XML As mentioned in Chapter 10, "Using DataSet Objects to Store Data," a DataSet contains two methods that output the contents of the DataRow objects as XML

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Modifying Rows in a DataTable In this section, you'll see the steps required to add, modify, and remove DataRow objects from a DataTable and then push those changes to the database

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Modifying Data Using a Strongly Typed DataSet In Chapter 10, you saw how to create and use a strongly typed DataSet class named MyDataSet. You can use objects of this class to represent the Customers table and rows from that table

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Finding, Filtering, and Sorting Rows in a DataTable Each row in a DataTable is stored in a DataRow object, and in this section you'll learn how to find, filter

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Finding DataRowView Objects in a DataView You can find the index of a DataRowView in a DataView using the Find() method of a DataView

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Step 3: Set the CommandText Property of the SqlCommand Object You use SQL to work with the information stored in a database. SQL is an industry standard language supported by SQL Server, Access, and Oracle

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Executing Commands that Modify Information in the Database You can use the ExecuteNonQuery() method of a Command object to execute any command that doesn't return a result set from the database

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