Developing a database application system using C #

····· Genesis indows Program

1. New Project Project type: Visual C # project, template : Windows Application

2. Use partial to separate the code of the same form into two files;

A code stored in VS auto-generated

A store of code that we write ourselves

2. Recognize form Classes

　　　　　　　　　　　

3. Window Common Properties

Window Title: Name

Icon for the form: icon

Background Image: BackgroundImage

Background color: BackColor

Background style: BackgroundImageLayout　　　

Maximize button: Maximinbox

Minimize button: Minimun　

Form side Shopping Style: Fromborderstyle　

FixedSingle: Parameter prevents changes to window size

FIXED3D: Parameter prevents changes to window size

Form initial Position: StartPosition

Centerscreen: The parameter screen is displayed in the middle

Form Status: Windowsstate

　　　　　　　　　

········ Designing a login Form

Control naming conventions

Control Name control class name naming prefix

Tag Label IBI

Text box textbox txt

Combo Box ComboBox CBO

Pushbutton button BTN

Tag Label:

Image: Images on a label

Text: Display of texts

Label TextBox:

MaxLength: Maximum number of characters

Multiline: Whether multiple lines of text can be entered

PasswordChar: Set the displayed password character as a password box

ReadOnly: Whether to allow edit true does not allow

Text: Associated Literals

Combo box combobox:

Items: item in a combo box

DropDownStyle: Style of combo box

Text: Combo box associated

Selectdindex: Index of the currently selected item, starting at 0

SelectedItem: Gets the currently selected item

Buttons: button:

Enable: Whether the control is available

Text: The file displayed

TextAlign: How text is aligned

··········· event-driven mechanisms

Windows Application Event Driver

Event-driven: respond to user events at any time and make appropriate processing

Steps for writing event handlers

1. Select the control

2. In the Properties window, click

3. Find Events

4. Double-click the Generate event handling method

5. Write the processing code

······· message box

Why Use a message box

displaying messages, requesting information from users

How to display a message box

Using the MessageBox object

How to create a message box

Using the MessageBox.Show () method

The simplest message box:

MessageBox.Show (the string to display)

message box with caption: if

MessageBox.Show (The string to display, the caption of the message box)

message box with caption, Button: if

MessageBox.Show (The string to display, the caption of the message box, the message button)

with title. Button. Icon's message box:

MessageBox.Show (string to display, message box caption, message box button, message box icon)

Example: private void Bthcancel_click (object sender, EventArgs e)

{

DialogResult result = MessageBox.Show ("Confirm Cancel login?"). "," Operation Tip ", messageboxbuttons.yesno,messageboxicon.question);

if (Result==dialogresult.yes)

{

This. Close ();

}

}

"" "User input validation

　　　　　　　　

············· implement a jump between forms

Step: 1 Define the Form object

2 Display Form

The called Form class name Form object =new the Called Form class name ();

The Form object. Show ();

　　　　　　

　　　　　　　　

Developing a database application system using C #