using System;
public class ResourceHolder : IDisposable
{
private bool isDisposed = false;
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!isDisposed)
{
if (disposing)
{
// Cleanup managed objects by calling their
// Dispose() methods.
}
// Cleanup unmanaged objects
}
isDisposed = true;
}
~ResourceHolder()
{
Dispose (false);
}
public void SomeMethod()
{
// Ensure object not already disposed before execution of any method
if(isDisposed)
{
throw new ObjectDisposedException(“ResourceHolder”);
}
// method implementation …
}
}

Okay ! I understood it Thanks ! :)