In a class with managed and unmanaged C# with Example

resources 
It's important to let finalization ignore managed resources. The finalizer runs on another thread -- it's possible that 
the managed objects don't exist anymore by the time the finalizer runs. Implementing a protected Dispose(bool) 
method is a common practice to ensure managed resources do not have their Dispose method called from a 
finalizer. 
public class ManagedAndUnmanagedObject : IDisposable 
{ 
private SqlConnection sqlConnection = new SqlConnection(); 
private UnmanagedHandle unmanagedHandle = Win32.SomeUnmanagedResource(); 
private bool disposed; 
public void Dispose() 
{ 
Dispose(true); // client called dispose 
GC.SuppressFinalize(this); // tell the GC to not execute the Finalizer 
} 
protected virtual void Dispose(bool disposeManaged) 
{ 
if (!disposed) 
{ 
if (disposeManaged) 
{ 
if (sqlConnection != null) 
{ 
sqlConnection.Dispose(); 
} 
} 
unmanagedHandle.Release(); 
disposed = true; 
} 
 

} 
~ManagedAndUnmanagedObject() 
{ 
Dispose(false); 
} 
}