c# wpf print barcode Defining a Data Source Using a BindingSource Component in .NET framework

Painting QR in .NET framework Defining a Data Source Using a BindingSource Component

Defining a Data Source Using a BindingSource Component
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The BindingSource component contains the information needed by controls to bind to a BindingSource by passing it a reference to a DataTable in a DataSet. By binding to the BindingSource instead of to the DataSet, you can easily redirect your application to another source of data without having to redirect all the data binding code to point to the new data source. The following code shows how to create a BindingSource and assign it a reference to the Northwind Customers table.
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' VB customersBindingSource = New BindingSource(NorthwindDataSet1, "Customers") // C# customersBindingSource = New BindingSource(northwindDataSet1, "Customers");
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Quick Check
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1. What is the difference between simple and complex binding 2. How do you navigate back and forth through the records in a DataTable
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Lesson 2: Implementing Data-Bound Controls
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Quick Check Answers
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1. Simple binding binds an individual bit of data (field, column, etc.) to a sin gle property of the control to bind to, whereas complex binding binds mul tiple bits of data to multiple properties of a control. 2. By calling the Move methods of a BindingSource component, or by using a BindingNavigator.
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Lab: Data Binding Controls
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In this lab you will bind data to Windows Forms Controls.
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Exercise 1: Simple Data Binding
This practice creates a Windows application and shows how to implement simple databound controls. This example will configure the data binding in code (as opposed to dragging items from the Data Sources window). 1. Create a Windows Application and name it SimpleDataBindingExample. 2. From the Data Sources window, click Add New Data Source (creates a new typed dataset by running the Data Source Configuration Wizard). 3. Leave the default selection of Database (on the Choose a Data Source Type page) and click Next. 4. On the Choose Your Data Connection page, select a connection to the Northwind sample database or create a new connection if needed. 5. Click Next, keeping the default values until you get to the Choose Your Database Objects page and select Products from the Tables node. 6. Click Finish to add the dataset to your project. 7. Build the project. 8. Drag a NorthwindDataSet object from the Toolbox onto the form. (You must build the project for the NorthwindDataSet to appear in the Toolbox.) 9. Drag a ProductsTableAdapter object from the Toolbox onto the form. Now that we have a dataset (and TableAdapter to fill it), we can create some con trols to display and navigate the data in the dataset (NorthwindDataSet). 10. Add a TextBox control to the form and set its Name property to ProductIDTextBox.
8
Implementing Data-Bound Controls
11. Add another TextBox to the form and set its Name property to ProductNameTextBox.
Add a couple of buttons for navigating the records.
12. Add another Button control and set the following properties:
Name = PreviousButton Text = Previous Name = NextButton Text = Next
13. Add a Button control and set the following properties:
14. Double-click an empty area on the form and create a Form1_Load event handler. 15. Add code to create a BindingSource global to the form and then add the code to configure the data binding to the Form1_Load event handler so your form code looks like the following:
' VB ' Create a BindingSource for the Products table
Private productsBindingSource As BindingSource
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles MyBase.Load ' Load the products table with data ProductsTableAdapter1.Fill(NorthwindDataSet1.Products) ' Create a BindingSource to the Products table
productsBindingSource = New BindingSource(NorthwindDataSet1, "Products")
' Configure the bindings of the TextBoxes
ProductIDTextBox.DataBindings.Add("Text", productsBindingSource, "ProductID")
ProductNameTextBox.DataBindings.Add("Text", productsBindingSource, "ProductName")
End Sub // C# //Create a BindingSource for the Products table
private BindingSource productsBindingSource;
private void Form1_Load(object sender, EventArgs e) { // Load the products table with data productsTableAdapter1.Fill(northwindDataSet1.Products); // Create a BindingSource to the Products table
productsBindingSource = new BindingSource(northwindDataSet1, "Products");
// Configure the bindings of the TextBoxes
Lesson 2: Implementing Data-Bound Controls
ProductIDTextBox.DataBindings.Add("Text", productsBindingSource, "ProductID"); ProductNameTextBox.DataBindings.Add("Text", productsBindingSource, "ProductName"); }
16. Double-click the Previous button and add the following code, which navigates back to the previous record in the data source of BindingSource.
' VB productsBindingSource.MovePrevious() // C# productsBindingSource.MovePrevious();
17. Double-click the Next button and add the following code, which navigates to the next record in the data source of BindingSource.
' VB productsBindingSource.MoveNext() // C# productsBindingSource.MoveNext();
18. Run the application. Click the Next and Previous buttons to move back and forth through the data in the Products table. Each text box is bound to a single column in the data table, and the BindingSource object handles the low-level maintenance.
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