1 public Form1 : Form
 2 {
 3   private MyType myDataValue;
 4   private TextBox textBoxName;
 5 
 6   private void InitializeComponent( )
 7   {
 8     textBoxName.Text = myDataValue.Name;
 9     this.textBoxName.Leave += new
10       System.EventHandler( this.OnLeave );
11   }
12 
13   private void OnLeave( object sender, System.EventArgs e )
14   {
15     myDataValue.Name = textBoxName.Text;
16   }
17 }
18 
19  

 1 private void Form1_Parse( object sender, ConvertEventArgs e )
 2 {
 3   try {
 4     Convert.ToInt32 ( e.Value );
 5   } catch
 6   {
 7     MessageBox.Show (
 8      string.Format( "{0} is not an integer",
 9        e.Value.ToString( ) ) );
10     e.Value = 0;
11   }
12 }

 1 public partial class Form1 : Form
 2     {
 3         private Employee m_emp = new Employee();
 4         public Form1()
 5         {
 6             InitializeComponent();
 7         }
 8 
 9         private void Form1_Load(object sender, EventArgs e)
10         {
11             m_emp.Name = "Wing";
12             m_emp.Address = "Beijing";
13             BindControlWithDataModel();
14         }
15 
16         private void button1_Click(object sender, EventArgs e)
17         {
18             lblName.Text = m_emp.Name;
19             lblAddress.Text = m_emp.Address;
20         }
21 
22         private void BindControlWithDataModel()
23         {          
24             txtName.DataBindings.DefaultDataSourceUpdateMode = DataSourceUpdateMode.OnValidation;
25             txtAddress.DataBindings.DefaultDataSourceUpdateMode = DataSourceUpdateMode.OnValidation;
26             
27             txtName.DataBindings.Add("Text", m_emp, "Name");
28             txtAddress.DataBindings.Add("Text", m_emp, "Address");
29             txtAddress.DataBindings.Add("BackColor", m_emp, "ExceedLength");            
30         }
31     }
32 
33     internal class Employee
34     {
35         private string m_strName;
36 
37         public string Name
38         {
39             get { return m_strName; }
40             set { m_strName = value; }
41         }
42         private string m_strAddress;
43 
44         public string Address
45         {
46             get { return m_strAddress; }
47             set { m_strAddress = value; }
48         }
49         private string m_nAge;
50 
51         public Color ExceedLength
52         {
53             get
54             {
55                 if (Address != null && Address.Length > 5)
56                 {
57                     return Color.Red;
58                 }
59                 else
60                 {
61                     return Color.Transparent;
62                 }
63             }
64         }        
65     }