RowState Enumeration in .NET

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RowState Enumeration
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Value Unchanged Added Modified Deleted Detached
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Description No changes have been made since the last AcceptChanges call or since the initial filling of the DataTable. This row has been added since the last AcceptChanges call. This row has been updated since the last AcceptChanges call. This row has been deleted from the DataTable since the last AcceptChanges call. This row has not yet been added to any DataTable.Rows collection.
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In addition to RowState, each row also maintains different versions after changes are made. These differing versions are accessed by passing a value from the DataRowVersion enumeration as an argument in addition to the column index when accessing the data in a row. For example, you can access the current and original values of a col umn in a specific DataRow to perform processing prior to calling AcceptChanges.
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Accepting and Rejecting Changes to a DataTable
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When all changes to a row are deemed valid, you can accept the modifications by call ing the DataRow.AcceptChanges method. Calling the AcceptChanges method sets the RowState of the row to Unchanged and commits all current values to original. You can call AcceptChanges on the DataRow, DataTable, or entire DataSet. If you decide to abort changes instead of accepting them, call the RejectChanges method of the DataRow, DataTable, or DataSet.
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DataTable Events
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DataTable objects expose several events that are raised when changes are being made to the data in the table.
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Create, Add, Delete, and Edit Data in a Disconnected Environment
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The main events available when working with DataTable objects are listed in Table 7-4.
Table 7-4
DataTable Events
Event ColumnChanged ColumnChanging RowChanged RowChanging RowDeleted RowDeleting
Desription Raised after a value is inserted into a column Raised when a value is submitted to change a column Raised after a row in the table has been edited Raised when a row in the table is edited Raised after a row is marked for deletion Raised when a row is marked for deletion
Row Errors
When errors are encountered during the processing of DataRows, a value is added to the RowError property. The RowError property is a string that is typically set to an error message describing the error, but it can be set to any string and used as needed in your application. Once a DataRow.RowError property is assigned, the DataTable.HasErrors property is automatically set to True, indicating errors exist in the DataTable. When it is determined that errors exist, you can use the DataTable.GetErrors method to return an array of DataRows containing all rows that have errors or, more specifically, all rows with a RowError value other than null (nothing, or the empty string). To remove an error, set the DataRow.RowError property to an empty string.
Quick Check
1. How do you add data to a DataTable 2. How do you commit pending modifications to the data in a DataTable
Quick Check Answers
1. Create a new DataRow and add it to the DataTable.Rows collection. 2. By calling AcceptChanges on the DataRow, DataTable, or DataSet.
Lesson 4: Working with Data in DataTable Objects
Lab: Working with Data in a DataTable
In this lab you will manipulate the data in a DataTable.
Exercise 1: Working with DataTable Objects
This practice will provide code examples that demonstrate adding data to a table, deleting rows in a table, and editing existing values in a data row and how to view the RowState and DataRowVersion information for records in a DataTable. After modifying records, the AcceptChanges and RejectChanges methods will be demonstrated as well. 1. Create a Windows application and name it WorkingWithDataTables. 2. Add a DataGridView to the form and change its Name property to CustomersDataGridView. 3. Add a button to the form and set the following properties:
Name = FillTableButton Text = Fill Table
4. Drop a SqlDataAdapter from the Toolbox onto the form to start the Data Adapter Configuration Wizard.
NOTE
SqlDataAdapter Toolbox item
If the SqlDataAdapter is not in the Toolbox, right-click the Data section of the Toolbox, select Choose Items, and then select the SqlDataAdapter item on the .NET Framework Components tab. Click OK.
5. Select or create a new connection to the Northwind database and click Next. 6. Leave the default option to Use SQL Statements, and then click Next. 7. Type SELECT * FROM Customers on the Generate The SQL Statements page and click Finish.
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