How to prevent Files with same Name?

Question

I have a service that takes a file from a library and send it to an already specified folder.

This becomes a problem when I'm having files with same names on diferent folders.

Lets say that the event sends files to folder X, and I have fileA on folder A and also a fileA but this one on folder B.

What happens is that the folder X will recieve the first fileA, and then will replace the first one with the second!

I'm trying to do it as a ItemAdding event to change the file name on folder X so I can have the 2 files on this folder. Possibly fileA and fileA_2.

But how can I get the file that is being moved, if properties.ListItem returns null?

thanks!

edit: here is the code I was trying to do:

public override void ItemAdding(SPItemEventProperties properties)
       {
           base.ItemAdding(properties);

           if (properties.ListItem != null && properties.ListItem["Name"] != null)
           {
               SPListItem currItem = properties.ListItem;
               string oldName = currItem["Name"].ToString();

               foreach (SPListItem item in properties.ListItem.ParentList.Items)
               {
                   if (item.Name.Equals(oldName))
                   {
                       currItem["Name"] += "_1";
                       properties.Web.AllowUnsafeUpdates = true;
                       EventFiringEnabled = false;
                       currItem.SystemUpdate();
                       properties.Web.AllowUnsafeUpdates = false;
                       EventFiringEnabled = true;
                       break;
                   }
               }
           }


       }

Answer 1

You can get URL of the file being added with properties.AfterUrl in ItemAdding event.

EDIT:

Check whether the specified file exists and if the file already exists cancel the event. That's the best you can do in ItemAdding event AFAIK.