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Table 7-6: DataRow Properties Property Description DataRow belongs Because the Rows property is a collection, you can add new data to the DataTable by using the Add method, which is available in two forms, as shown in Table 7-7. Table 7-7: Rows.Add Methods Method Add(DataRow) Description Adds the specified DataRow to the table Creates a new DataRow in the table and sets its Item values as specified in the dataValues object array
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1. Select btnAddRow in the ControlName list, and then select Click in the MethodName list. Visual Studio adds the Click event handler template to the code. 2. Add the following code to create a new DataRow, and add it to the Customers table: 3. Dim drNew As System.Data.DataRow 4. 5. 'Create the new row 6. drNew = Me.dsMaster1.CustomerList.NewRow 7. drNew.Item("CustomerID") = "ANEWR" 8. drNew.Item("CompanyName") = "A New Row" 9. 10. 'Add row to table 11. Me.dsMaster1.CustomerList.Rows.Add(drNew) 12. 13. 'Refresh the display Me.lbClients.Refresh() 14. Press F5 to run the application. 15. Click Add DataRow. The application adds the new row to the table. 16. Scroll to the bottom of the Clients list box to confirm the addition.
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17. Close the application.
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1. In the form designer, double-click the Add DataRow button. Visual Studio adds the Click event handler to the code window. 2. Add the following procedure to create a new DataRow, and add it to the Customers table: 3. System.Data.DataRow drNew; 4. 5. //Create the new row 6. drNew = this.dsMaster1.CustomerList.NewRow(); 7. drNew["CustomerID"] = "ANEWR"; 8. drNew["CompanyName"] = "A New Row"; 9. 10. //Add row to table 11. this.dsMaster1.CustomerList.Rows.Add(drNew); 12. 13. //Refresh the display 14. this.lbClients.Refresh(); 15. Press F5 to run the application. 16. Click Add DataRow. The application adds the new row to the table. 17. Scroll to the bottom of the Clients list box to confirm the addition.
18. Close the application. The RowState property of the DataRow reflects the actions that have been taken since the DataTable was created or since the last time the AcceptChanges method was called. The possible values for the RowState property are shown in Table 7-8. Table 7-8: DataRowState Values Property Added Description The DataRow is new. The DataRow has been deleted from the table. The DataRow has not yet been added to a table. The contents of the DataRow have been changed. The DataRow has not been modified.
Deleted
Detached
Modified
Unchanged
Display the Row State
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1. Select btnVersion in the ControlName list, and then select Click in the MethodName list. Visual Studio adds the Click event handler template to the code. 2. Add the following code to edit a row and display its properties:
3. Dim strMessage As String 4. 5. With Me.dsMaster1.CustomerList.Rows(0) 6. 7. 8. 9. 10. 11. End With MessageBox.Show(strMessage) 12. Press F5 to run the application. 13. Click Row Version. The application displays a message box indicating the changes. .Item("CustomerID") = "NEWVAL" strMessage = "The RowState is " & .RowState.ToString strMessage &= vbCrLf & "The original value was " strMessage &= .Item("CustomerID", DataRowVersion.Original) strMessage &= vbCrLf & "The new value is " strMessage &= .Item("CustomerID", DataRowVersion.Current)
14. Close the application.
Visual C# .NET
1. In the form designer, double-click the Row Version button. Visual Studio adds the Click event handler to the code window. 2. Add the following procedure to edit a row and display its properties: 3. string strMessage; 4. System.Data.DataRow dr; 5. 6. dr = this.dsMaster1.CustomerList.Rows[0]; 7. dr["CustomerID"] = "NEWVAL"; 8. 9. strMessage = "The RowState is " + dr.RowState.ToString(); 10. strMessage += "\nThe original value was "; 11. strMessage += dr["CustomerID", DataRowVersion.Original]; 12. strMessage += "\nThe new value is "; 13. strMessage += dr["CustomerID", DataRowVersion.Current]; 14.
MessageBox.Show(strMessage); 15. Press F5 to run the application. 16. Click Row Version. The application displays a message box indicating the changes.
17. Close the application. Constraints Along with the DataTable s PrimaryKey property, the Constraints collection is used to maintain the integrity of the data within a DataTable. The System.Data.Constraint object has only the two properties, which are shown in Table 7-9. Table 7-9: Constraint Properties Property ConstraintName Description The name of the constraint. This property is used to reference the Constraint in code. The DataTable to which the constraint belongs.
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