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There are two solutions. The first choice is to change the Form.AutoValidate setting before you attempt to close the form. For example, this event handler will breeze past any validation routines: Private Sub cmdClose_Click(ByVal sender As Object, ByVal e As EventArgs) _ Handles cmdClose.Click Me.AutoValidate = AutoValidate.Disable Me.Close() End Sub There s another option. When the validation code sets the cancel flag, it indicates that the form should not be allowed to close. However, you still have the chance to override this decision by handling FormClosing. At this point, you can clear the cancel flag if you want, allowing the form to close. Here s an example that lets the user decide: Private Sub Form1_FormClosing(ByVal sender As Object, _ ByVal e As FormClosingEventArgs) Handles MyBase.FormClosing ' If e.Cancel is True, the cancel flag has been set by a validation routine. If e.Cancel Then Dim result As DialogResult = MessageBox.Show( _ "There are still errors on the form. Do you wish to close the form ", _ "Errors found", MessageBoxButtons.YesNo) If result = DialogResult.Yes Then e.Cancel = False End If End Sub This approach is quite a bit different than the first solution, because it ensures that your validation code runs.

Interrupting users with a message box is a crude way of pointing out an error. It s not likely to get users on your side, and you won t find it in any modern Windows application. A much better approach is to provide some kind of on-screen indication about the problem, like an explanatory error message next to the incorrect input. The .NET Framework provides an elegant way to accomplish this: ErrorProvider control. The ErrorProvider has a simple role in life it can display an error icon (which looks like a red exclamation point) next to any control. Typically, you ll show the error icon next to a control that has invalid input. You ll also specify a detailed text message. The error message appears in a tooltip if the user hovers over the error icon with the mouse pointer (see Figure 18-3). The ErrorProvider is a provider control a special type of user-interface ingredient introduced in 4. Like all other providers, you add a single instance of the ErrorProvider to the form you want to validate. You can then use that instance to display an error icon next to any control. To add the ErrorProvider, you can drag it from the Toolbox into the component tray, or you can create it manually in code. In the latter case, make sure you create a member variable to track it so you can access it later.

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Supporting Active Data Objects (ADO.NET) 2.0

To show an error icon next to a control, you use the ErrorProvider.SetError() method. The following code segment shows the same text box validation code as in the previous example, which reacts to the TextBox.Validating event. However, the code has been rewritten so that it doesn t stop the user from moving to the new control. Instead, if validation fails, it simply indicates the error using the error icon. Private Sub txtName_Validating(ByVal sender As Object, _ ByVal e As System.ComponentModel.CancelEventArgs) _ Handles txtFirstName.Validating, txtLastName.Validating Dim ctrl As Control = CType(sender, Control) If ctrl.Text = "" Then ErrorProvider1.SetError(ctrl, "You must enter a first and last name.") Else ErrorProvider1.SetError(ctrl, "") End If End Sub To hide the error icon you must explicitly clear the error message when validation succeeds.

CHAPTER 11 LIGHTS, CAMERA, ACTION!

Note This example uses the time-honored TextBox. However, there s no reason you can t validate other

ODP.NET has embraced the ADO.NET specification from Microsoft, providing an extensive set of classes that are familiar to the .NET developer. Let s take a look at some of the basic ADO.NET features supported by ODP.NET in the table in Table 2-1. Table 2-1. ADO.NET Features Supported by ODP.NET

input controls, like lists, check boxes, radio buttons, and more, using the exact same Validating event and ErrorProvider control.

ODP.NET supports all the basic ADO.NET classes such as the DataAdapter, DataReader, Connection, Command, and Parameter classes. The ODP.NET classes are correspondingly named OracleDataAdapter, OracleDataReader, OracleConnection, OracleCommand, and OracleParameter. ODP.NET supports both local and distributed transactions. It can also additionally support promotable transactions (covered in the later parts of this chapter). ODP.NET supports the GetSchema method and is able to retrieve an extensive set of database metadata. ODP.NET provides the OracleConnectionStringBuilder class to assist you in constructing connection strings.

In this example, the validation event doesn t cancel the user s action. This is a more userfriendly alternative, but it also means that when the user clicks OK to submit the form, you need to explicitly check if there are any errors before continuing. Here s an example that verifies there are no errors attached to either text box:

If ErrorProvider1.GetError(txtFirstName) = "" And _ ErrorProvider1.GetError(txtLastName) = "" Then Me.Close() Else MessageBox.Show("You still have invalid input.", "Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Warning) End If End Sub

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