Simple data binding is the ability to bind a control to a single data element. When you need to display and manipulate more than one data element at a time,then this is called complex data binding.Complex data binding is the ability to bind a control to more than one data element and more than one record in a database.
Class Hierarchies Relevant to Data Binding
//Text box controls—Used to display, or accept as input, //a single line of text.Can also support multilines. System.Windows.Forms.TextBox class System.Windows.Forms.DataGridTextBox subclass System.Web.UI.WebControls.Textbox class //List controls—Enable you to display a list of items to //the user that the user can select by clicking. System.Windows.Forms.ListControl class System.Windows.Forms.ComboBox subclass System.Windows.Forms.ListBox subclass System.Web.UI.WebControls.ListControls class System.Web.UI.WebControls.CheckBoxList subclass System.Web.UI.WebControls.DropDownList subclass System.Web.UI.WebControls.ListBox subclass System.Web.UI.WebControls.RadioButtonList subclass //DataGrid controls—Used to display data in a //scrollable, tabular grid. System.Windows.Forms.DataGrid class System.Web.UI.WebControls.DataGrid class
For ListBox controls, you can bind the control to a DataSet class using the DataSource and DisplayMember properties as you have seen in our Windows Forms example:
ListBox1.DataSource = customer ListBox1.DisplayMember = "Customers.CompanyName"
Or, you can use the DataBinding method programmatically to achieve the same results.
ListBox1.DataBindings.Add(New System.Windows.Forms.Binding ("SelectedItem", customer, "Customers.CompanyName"))
For DataGrid controls, you bind the control to a DataSet class using the DataSource and DataMember properties:
DataGrid1.DataMember = "Customers.CustomersOrders" DataGrid1.DataSource = customer
Or, use the SetDataBinding method programmatically to achieve the same results: