Database write causes a reset.

[Peter Hamilton-Scott]

Guys, below is a procedure I call in my app. It works fine until it gets 
to the DmWrite at which point it cause a reset. I've basically copied 
the code from elsewhere and tweaked it. My DBRef variable is fine. All 
I'm trying to do is to create the appinfo control record. I don't do 
anything with the structure yet but I'd like to think that once I've got 
the handle and converted it to a local id, then whether I initialise the 
structure or not is neither here nor there. Could someone take a look at 
this and tell me what I'm doing wrong, or perhaps what I'm not doing?

Thanks.
void PopulateDatabase(void)
{
    typedef struct
    {
        AppInfoType AppInfo;
        UInt16 Test;
    } TestDBControl;
    TestDBControl *ControlRecord = NULL;
    MemHandle Handle;
    LocalID LocalId;
    LocalID DBId;
    UInt16 CardNo;
    if(DmOpenDatabaseInfo(_DBRef, &DBId, NULL, NULL, &CardNo, NULL) == 
errNone)
    {
        Handle = DmNewHandle(_DBRef, sizeof(TestDBControl));
        if(Handle)
        {
            LocalId = MemHandleToLocalID(Handle);
            if(DmSetDatabaseInfo(CardNo, DBId, NULL, NULL, NULL, NULL, 
NULL, NULL, NULL,
                                 &LocalId, NULL, NULL, NULL) == errNone)
            {
                ControlRecord = (TestDBControl *) MemHandleLock(Handle);
                if(ControlRecord != NULL)
                {
                    DmWrite(Handle, (UInt32) 0, ControlRecord, (UInt32) 
sizeof(TestDBControl));
                    MemPtrUnlock(ControlRecord);
                }
            }
            MemHandleFree(Handle);
        }
    }
    return;
}

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