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    <p>Here is my code,</p> <pre><code>public class ValueReader { List&lt;IDataReader&gt; _list = new List&lt;IDataReader&gt;(); object _criticalSection = new object(); public ValueReader() { //Nothign here } public void Attach(IDataReader reader) { lock(_criticalSection) { _list.Add(reader); } } public void Detach(IDataReader reader) { lock(_criticalSection) { _list.Remove(reader); } } public void Notify(string value) { lock(_criticalSection) { foreach(IDataReader reader in _list) { reader.Update(value); } } } public void Start() { new Thread(new ThreadStart(Run)).Start(); } private void Run() { while(true) { //generate value Notify(value); Thread.Sleep(5000); } } } public interface IDataReader { void UpdateControls(string value); } public class FirstClass : IDataReader { .... ...... ValueReader _reader = null; public FirstClass() { _reader = new ValueReader(); _reader.Start(); _reader.Attach(this); } private void AddToSmartClient() { // _reader has added to SmartClient's WorkItem } private delegate void UpdateControlDelegate(string value); public void UpdateControl(string value) { if(txtAddress.InvokeRequired) { txtAddress.Invoke(new UpdateControlDelegate(UpdateControl), value); } else { txtAddress.Text = value; txtValue.Text = value; } } } public class SecondClass : IDataReader { .... ...... ValueReader _reader = null; public void SecondClass() { _reader = ReadFromSmartClient(); _reader.Attach(this); } private ValueReader ReadFromSmartClient() { reader = //Get from SmartClient's Workitem. return reader } private delegate void UpdateControlDelegate(string value); public void UpdateControl(string value) { if(InvokeRequired) { BeginInvoke(new UpdateControlDelegate(UpdateControl), value); } else { control1.Text = value; control2.Text = value; } } } </code></pre> <p>I invokes only FirstClass for some time. In this case its working fine. After some time i invoked the Second class, at this time while calling Attach from secondClass the application is hanging.(i monitered that its comming until Attach methods's lock(_criticalSection).</p> <p>After some time i converter the Update control in the Frist Class as follow</p> <pre><code> public void UpdateControl(string value) { if(InvokeRequired) { BeginInvoke(new UpdateControlDelegate(UpdateControl), value); } else { txtAddress.Text = value; txtValue.Text = value; } } </code></pre> <p>This is working well after invoking the SecondClass also. Why its happening?</p>
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