Hello:

I'm using the UniView to display forum posts within a thread. The code looks something like this:

DataSet ds = ForumPostInfoProvider.SelectForumPosts(ForumID, "/%", "PostIDPath Like '" + ForumPostInfoProvider.GetPath(null, ThreadID) + "%'", ThreadOrderBy, MaxRelativeLevel, onlyPublish, -1, null, currentOffset, maxRecords, ref totalRecords);

if (!DataHelper.DataSourceIsEmpty(ds))
{
    GroupedDataSource gpd = new GroupedDataSource(ds, "PostParentID", "PostLevel");
    listForums.RelationColumnID = "PostId";
    listForums.DataSource = gpd;
    listForums.DataBind();
}

The problem is that the top level post has a PostParentID of NULL. So when I data bind I get an "Object cannot be cast from DBNull to other types" exception.

Is there any way to tell UniView that the top-level post in my hierachy is going to have a NULL parent ID? Or do I have to loop through my dataset and change the parent ID to something like -1?

Thanks in advance!