Determining if ObjectStateManager has dirty records

I would like a sanity check.

Here is a static method I wrote to determine if the .Net Framework Entity's ObjectStateManager has any dirty records. (This code would be used to determine the state of the Save button, namely, count>0 means enabled else disabled.)

Is there no easier way to do this? Does ObjectStateManager not have any kind of a property to flag whether its contents are dirty?

static public int ChangedCount(this ObjectStateManager manager)
    {
        int changedCount = 0;
        try
        {
            changedCount += manager.GetObjectStateEntries(EntityState.Added).Count<ObjectStateEntry>();
        }
        catch {}

        try
        {
            changedCount += manager.GetObjectStateEntries(EntityState.Deleted).Count<ObjectStateEntry>();
         }
         catch { }
         
         try
         {
            changedCount += manager.GetObjectStateEntries(EntityState.Modified).Count<ObjectStateEntry>();
         }
         catch { }
            
         return changedCount;
    }

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