I have found an temporary workaround for this issue.

When we set base.RaiseListChangedEvents = true; or call base.ResetBindings() before removing item from the list then wingrid never hangs.

I want solution for the following topics:

1. Is there any adverse effect on performance of using base.RaiseListChangedEvents/base.ResetBindings() ?

2. Same binding list is used in many controls, why we get ui hangs in specific control after upgrading infragistics.?

My changed generic method code is:

public void Remove(T item)
{
try
{
if (_dict.ContainsKey(item.GetKey()))
{
T olditem = GetItem(item.GetKey());

base.RaiseListChangedEvents = true;

// base.ResetBindings();
base.Remove(olditem);
_dict.Remove(item.GetKey());
}
}
catch (Exception ex)
{
// Invoke our policy that is responsible for making sure no secure information
// gets out of our layer.
bool rethrow = ExceptionPolicy.HandleException(ex, Global.ApplicationConstants.POLICY_LOGANDSHOW);

if (rethrow)
{
throw;
}
}
}

Thanks