c# wpf print barcode ' VB ' Populate the CellValueTextBox with the selected cell in .NET

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' VB ' Populate the CellValueTextBox with the selected cell
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CellValueTextBox.Text = CustomersDataGridView.CurrentCell.Value.ToString
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' Refresh the other text boxes
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UpdateRowVersionDisplay()
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// C# // Populate the CellValueTextBox with the selected cell
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CellValueTextBox.Text = CustomersDataGridView.CurrentCell.Value.ToString();
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// Refresh the other text boxes
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UpdateRowVersionDisplay();
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23. Create an event handler for the AcceptChangesButton.Click event and add the fol lowing code:
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UpdateRowVersionDisplay()
// C# GetSelectedRow().AcceptChanges();
UpdateRowVersionDisplay();
24. Create an event handler for the RejectChangesButton and add the following code:
' VB GetSelectedRow().RejectChanges()
UpdateRowVersionDisplay()
// C# GetSelectedRow().RejectChanges();
UpdateRowVersionDisplay();
25. Run the application and click the Fill Table button.
7
Create, Add, Delete, and Edit Data in a Disconnected Environment
26. Click around the grid and notice that the Original and Current values show as the same, and the RowState display is Unchanged. 27. Now click the cell that contains Maria Anders (in the first row) and type Maria AndersEdited in the CellValueTextBox. 28. Click the UpdateValue button and notice that the value is updated in the grid, the Current and Original text boxes display the different versions of the record, and the RowState has been changed to read Modified. 29. Now click the Add Row button. 30. Scroll down to the bottom of the grid and select one of the cells in the new record (WINGT).
Notice that the RowState is Added to reflect that this is a new row, and the Origi
nal text box shows that there is no original data, again because this is a new row.
Figure 7-13 Form after clicking the Add Row button
31. Scroll back to the row with the MariaAndersEdited field and select it. 32. Click the RejectChanges button and inspect the row version and row state values. 33. Scroll to the WINGT record and select it. 34. Click the Accept Changes button and inspect the row version and row state values.
Lesson 4: Working with Data in DataTable Objects
Lesson Summary
Add data to a DataTable by creating a new DataRow and adding it to the DataTable.Rows collection. Edit data in a DataTable by setting the values of the individual DataColumn objects in a DataRow. Delete rows in a DataTable by calling the Delete method of a DataRow. Monitor and keep track of changes to DataRow objects by using the RowState and RowVersion enumerations. DataTable events are raised as data is changed in specific DataColumn objects or entire DataRow objects. Set the RowError property of a DataRow to indicate a row with an error.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each choice is correct or incorrect are located in the Answers section at the end of the book.
1. When adding a new row to a DataTable: A. Create an instance of a DataRow and call the Update method of the DataAdapter. B. Create an instance of a DataRow (or typed row), and add it to the Rows col lection of the DataTable. C. Call the DataTable.NewRow method. D. Create an instance of a DataRow.
7
Create, Add, Delete, and Edit Data in a Disconnected Environment
2. How do you access the original value in the CustomerId column A. OriginalValue = DataRow( CustomerID ).DataRowVersion.Original B. OriginalValue = DataColumn( CustomerID ).Original C. OriginalValue = DataRow( CustomerID , DataRowVersion.Original) D. OriginalValue = DataRow( CustomerID ) 3. What DataTable event would you handle to validate for an acceptable value in a column (Choose all that apply.) A. ColumnChanged B. ColumnChanging C. RowChanged D. RowChanging
Lesson 5: Working with XML in DataSet Objects
Lesson 5: Working with XML in DataSet Objects
This lesson describes how to use DataSet objects when working with data formatted as XML. DataSet objects can be filled from an XML document or an XML stream, and they can load or write out their schema information. DataSet objects have several methods for working with XML data that will be described in the following examples.
After this lesson, you will be able to:
Represent data in a DataSet using XML.
Load a DataSet from an XML stream or document. Write a DataSet as XML data. Load DataSet schema information from an XML stream or document. Write DataSet schema information as XML schema (XSD). Synchronize a DataSet with an XmlDataDocument. Perform an XPath query on a DataSet. Apply an XSLT transform to a DataSet. Create nested DataRelation objects in a DataSet to represent XML data. Generate DataSet relational structures from XML schema (XSD). Map XML schema (XSD) constraints to DataSet constraints. Infer DataSet structures from an XML stream or document.
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