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Data Binding in TierDeveloper

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Data Binding in TierDeveloper Powered By Docstoc
					by: Ann Morris

INTRODUCTION

One of the most powerful aspects of .NET and Windows Forms is data binding. Data binding is
the process of associating user interface (UI) elements with a data source to generate a visual
representation of data. Two types of data binding are available for Windows Forms: Simple Data
Binding and Complex Data Binding.

Simple data binding allows you to bind one data element to a control. In many situations you
want to display only one record at a time e.g., customers personal information. Textboxes and
labels are such controls that are used for this purpose and hence called simple binding.

Complex data binding allows you to bind more than one data element to a control. For example
if you want to display number of orders placed by a customer you would use controls like data
grid controls, list boxes.

The data binding capabilities of .NET are similar to ADO and the Visual Basic controls. Visual
Basic or Delphi users will find .NET data binding more flexible and more transparent. It saves a
lot of time in both Windows Forms and ASP.NET applications.

How to Bind TierDeveloper DataSet to Data Grid Control

Assumptions

   1. You are using TierDevelopers sample project TDevStoreSQL.tier and youve defined a
      query method GetAllCustomers for the object Customers.
   2. You have generated the components and Windows Forms Application from
      TierDeveloper.
   3. You have access to a database, such as Microsoft SQL Server or Microsoft Access.

In order to bind Data Grid please follow these steps: -

1. Open the TierDeveloper generated project in VS.NET

2. Add and open a new Windows Form.

3. Select the ToolBox window and click on Windows Forms tab.

4. Drag DataGrid component and place it anywhere on the Windows Form.

5. Paste the following code in the Windows Form Load event.

[Visual Basic]
Private Sub CustomersForm_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load



          Dim cf As CustomersFactory = New CustomersFactory

          DataGrid1.CaptionText = "Customers"

          DataGrid1.DataSource = cf.GetAllCustomersDS()



End Sub


[C#]



Private void CustomersForm_Load(object sender, System.EventArgs e)

{



          CustomersFactory cf = New CustomersFactory();

          DataGrid1.CaptionText = "Customers" ;

          DataGrid1.DataSource = cf.GetAllCustomersDS();



}


6. The postfix DS shows that this method will return a DataSet object.

7. Run the application and you will see that the DataGrid is filled with all the customers.

Note: You can also bind datagrid to customer collection to do this you will just have to change
the grid data source to the method that can return collection.



DataGrid1.DataSource = cf.GetAllCustomers();


This article was posted on December 13, 2004

				
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