How to implement two way databinding in windows form c#

Question

suppose my win form has textboxes, listbox, dropdown, radio button and check box. now i want to bind those control and whenever data will be changes from out side then change should be reflected in control level. how to achieve it in winform. help me with
a small working sample code. thanks

Answer 1

Hello,
If using SQL-Server look at using SQL Dependency class to get notified of changes outside of your application say by another app or from even SQL Server Management Studio
https://www.google.com/search?q=sqldependency+example&sourceid=ie7&rls=com.microsoft:en-US:IE-SearchBox&ie=&oe=&rlz=&safe=active&gws_rd=ssl
Sorry I don't have a working example but perhaps the following might provide a clue into what is needed. I am only using a DataGridView but this could be expanded to other controls. There is a good deal of preparation and work internally to have this working
right when considering all scenarios
Form code
namespace FrontEnd_CS
/// <summary>
/// Provides the basics to listen to a database table operations, see also the
/// Readme file in the Solution Items
/// </summary>
/// <remarks>
/// DgvFilterManager is a third party component that permits right-click a column header
/// in a DataGridView and do filtering on one or more columns
/// </remarks>
public partial class Form1 : Form
private BindingSource bs = new BindingSource();
private Customers CustomerData = null;
public Form1()
InitializeComponent();
try
SqlClientPermission perm = new SqlClientPermission(System.Security.Permissions.PermissionState.Unrestricted);
perm.Demand();
catch
throw new ApplicationException("No permission");
public void OnNewMessageFromServer()
ISynchronizeInvoke iSyncInvoke = (ISynchronizeInvoke)this;
// Check if the event was generated from another thread and needs invoke instead
if (iSyncInvoke.InvokeRequired)
Customers.NewMessage messageDelegate = new Customers.NewMessage(OnNewMessageFromServer);
iSyncInvoke.BeginInvoke(messageDelegate, null);
return;
// If not coming from a seperate thread we can access the Windows form controls
LoadCurrentData();
private void LoadCurrentData()
DataGridView1.DataSource = null;
bs.DataSource = CustomerData.GetMessages();
DataGridView1.DataSource = bs;
DataGridView1.ExpandColumns();
bindingNavigator1.BindingSource = bs;
private void Form1_Load(object sender, EventArgs e)
CustomerData = new Customers();
CustomerData.OnNewMessage += OnNewMessageFromServer;
LoadCurrentData();
Support code
namespace BackEnd_CS
public class Customers
private static string ConnectionString = "Server=.\\SQLEXPRESS;Trusted_Connection=True;Initial Catalog=CustomerDatabase";
private SqlConnection Connection = null;
public delegate void NewMessage();
public event NewMessage OnNewMessage;
public Customers()
// Stop an existing services on this connection string just be sure
SqlDependency.Stop(ConnectionString);
// Start the dependency, User must have -- SUBSCRIBE QUERY NOTIFICATIONS permission
// Database must also have SSB enabled -- ALTER DATABASE CustomerDatabase SET ENABLE_BROKER
SqlDependency.Start(ConnectionString);
// Create the connection
Connection = new SqlConnection(ConnectionString);
~Customers()
SqlDependency.Stop(ConnectionString);
/// <summary>
/// Retreive messages from database via conventional SQL statement
/// </summary>
/// <returns></returns>
/// <remarks></remarks>
public DataTable GetMessages()
DataTable dt = new DataTable();
try
// Create command
// Command must use two part names for tables
// SELECT <field> FROM dbo.Table rather than
// SELECT <field> FROM Table
// Do not use
// FROM [CustomerDatabase].[dbo].[Customer]
// Use
// FROM [dbo].[Customer]
// Query also can not use *, fields must be designated
SqlCommand cmd = new SqlCommand("SELECT [Identifier],[CompanyName],[ContactName],[ContactTitle] FROM [dbo].[Customer]", Connection);
// Clear any existing notifications
cmd.Notification = null;
// Create the dependency for this command
SqlDependency dependency = new SqlDependency(cmd);
// Add the event handler
dependency.OnChange += OnChange;
// Open the connection if necessary
if (Connection.State == ConnectionState.Closed)
Connection.Open();
// Get the messages
dt.Load(cmd.ExecuteReader(CommandBehavior.CloseConnection));
catch (Exception ex)
throw ex;
return dt;
/// <summary>
/// Handler for the SqlDependency OnChange event
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnChange(object sender, SqlNotificationEventArgs e)
SqlDependency dependency = sender as SqlDependency;
// Notices are only a one shot deal so remove the existing one so a new one can be added
dependency.OnChange -= OnChange;
// Fire the event
if (OnNewMessage != null)
OnNewMessage();
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