Estimated lesson time: 30 minutes in Visual Studio .NET

Creating QR in Visual Studio .NET Estimated lesson time: 30 minutes

Estimated lesson time: 30 minutes
QR Code ISO/IEC18004 Generation In Visual Studio .NET
Using Barcode drawer for ASP.NET Control to generate, create Denso QR Bar Code image in ASP.NET applications.
www.OnBarcode.com
Printing Bar Code In VS .NET
Using Barcode printer for ASP.NET Control to generate, create barcode image in ASP.NET applications.
www.OnBarcode.com
Custom Dialog Boxes
QR Code ISO/IEC18004 Encoder In Visual C#.NET
Using Barcode maker for .NET Control to generate, create QR image in Visual Studio .NET applications.
www.OnBarcode.com
Creating QR In VS .NET
Using Barcode generator for .NET Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
www.OnBarcode.com
Dialog boxes are commonly used to gather information from the application user. For example, Visual Studio provides prebuilt dialog boxes that enable the user to select a file, font, or color. You can create custom dialog boxes to collect specialized informa tion from the user. For example, you might create a dialog box that collects user infor mation and relays it to the main form of the application. A dialog box generally includes an OK button, a Cancel button, and whatever controls are required to gather information from the user. The general behavior of an OK but ton is to accept the information provided by the user and then to close the form, returning a result of DialogResult.OK. The general behavior of the Cancel button is to reject the user input and close the form, returning a result of DialogResult.Cancel. Visual Studio .NET provides a template for dialog boxes.You can add a new dialog box to your application by selecting the Project Menu, then Add New Item, and then the Dialog Box template. Figure 14-2 shows an example of the Dialog Box template that is added to your application.
QR Code 2d Barcode Generation In Visual Basic .NET
Using Barcode generator for .NET Control to generate, create Denso QR Bar Code image in .NET applications.
www.OnBarcode.com
Draw Code 39 Extended In Visual Studio .NET
Using Barcode maker for ASP.NET Control to generate, create Code 39 Extended image in ASP.NET applications.
www.OnBarcode.com
14
Print Barcode In .NET
Using Barcode generator for ASP.NET Control to generate, create barcode image in ASP.NET applications.
www.OnBarcode.com
Print European Article Number 13 In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create EAN-13 Supplement 5 image in ASP.NET applications.
www.OnBarcode.com
Creating Windows Forms Controls
Data Matrix Creator In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create Data Matrix 2d barcode image in ASP.NET applications.
www.OnBarcode.com
Create EAN / UCC - 13 In .NET
Using Barcode creation for ASP.NET Control to generate, create EAN / UCC - 13 image in ASP.NET applications.
www.OnBarcode.com
Figure 14-2 The Dialog Box template
Draw Linear Barcode In .NET
Using Barcode generator for ASP.NET Control to generate, create 1D image in ASP.NET applications.
www.OnBarcode.com
Encoding Leitcode In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create Leitcode image in ASP.NET applications.
www.OnBarcode.com
You can set the DialogResult property for the OK and Cancel buttons in the Properties window. In general, you should set the DialogResult for the OK button to DialogResult.OK and the DialogResult for the Cancel button to DialogResult.Cancel.
Encoding Barcode In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
www.OnBarcode.com
Printing ECC200 In Java
Using Barcode maker for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
www.OnBarcode.com
Modal and Modeless Dialog Boxes
Encode Code 3 Of 9 In Visual C#.NET
Using Barcode encoder for .NET Control to generate, create USS Code 39 image in VS .NET applications.
www.OnBarcode.com
USS Code 39 Encoder In None
Using Barcode maker for Software Control to generate, create Code-39 image in Software applications.
www.OnBarcode.com
A modal dialog box is a dialog box that pauses program execution until the dialog box is closed. Conversely, a modeless dialog box allows application execution to continue.
Creating GS1 - 12 In None
Using Barcode generator for Online Control to generate, create UPC Code image in Online applications.
www.OnBarcode.com
Create UCC-128 In Objective-C
Using Barcode generator for iPhone Control to generate, create EAN 128 image in iPhone applications.
www.OnBarcode.com
Displaying a Dialog Box
Creating DataBar In Java
Using Barcode maker for Java Control to generate, create GS1 DataBar Stacked image in Java applications.
www.OnBarcode.com
PDF 417 Recognizer In .NET Framework
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
You can display a dialog box modelessly by using the Form.Show method, as shown here:
' VB Dim aDialog As New DialogForm() aDialog.Show() // C# DialogForm aDialog = new DialogForm(); aDialog.Show();
When shown modelessly, a dialog box does not return a dialog result and does not halt program execution, but you can still retrieve information from the form by exam ining property values of the form.
Lesson 3: Creating Extended Controls and Dialog Boxes
You can show a dialog box modally by calling the Form.ShowDialog method, as shown here:
' VB Dim aDialog As New DialogForm() aDialog.ShowDialog() // C# DialogForm aDialog = new DialogForm(); aDialog.ShowDialog();
The ShowDialog method returns the DialogResult value of the button that was clicked to close the form. If the Button.DialogResult property is not set, it returns DialogResult.None. The following example demonstrates how to retrieve the DialogResult of a dialog box:
' VB Dim aDialog As New DialogForm() Dim aResult As DialogResult aResult = aDialog.ShowDialog() If aResult = DialogResult.OK Then ' Do something with the dialog box information End If // C# DialogForm aDialog = new DialogForm();
DialogResult aResult;
aResult = aDialog.ShowDialog();
if (aResult == DialogResult.OK)
// Do something with the dialog box information }
Setting the ParentForm Property of the Dialog Box
You can also set the ParentForm property of the dialog box with the ShowDialog method by specifying the parent form as a parameter, as shown in the following example:
' VB Dim aDialog As New DialogForm() Dim aResult As DialogResult aResult = aDialog.ShowDialog(Me) // C# DialogForm aDialog = new DialogForm();
DialogResult aResult;
aResult = aDialog.ShowDialog(this);
14
Creating Windows Forms Controls
Retrieving Information from the Parent Form
Once the parent form has been set, you can retrieve information from it by casting the ParentForm property to the appropriate type and then reading its properties, as shown in the following example. This example assumes an instance of a dialog box called DialogForm and that the ParentForm property has been set to an instance of a form called Form1.
' VB Dim aForm As Form1
aForm = CType(DialogForm.ParentForm, Form1)
' You can now read the information of the parent form
// C# Form1 aForm;
aForm = (Form1)DialogForm.ParentForm;
// You can now read the information of the parent form
Once a dialog box has been closed it is no longer visible to the user, but its instance remains in memory. You can then retrieve the user input from the dialog box.
Copyright © OnBarcode.com . All rights reserved.