EF ExecuteSqlCommand with int array parameter

I got a problem while trying to pass parameter with type array of int. What I have done so far as below but both methods failed.

Method 1 (Failed) :

int[] CategoryArray;
CategoryArray = new int[userItem.ListItemId.Count()];
int i=0;

foreach (int catID in userItem.ListItemId)
{
    CategoryArray[i] = catID;
    i++;
}

db.Database.ExecuteSqlCommand("delete from SupportRegion where UserId={0} and CategoryID not in ({1})", userItem.UserId, CategoryArray);

Method 2 (also failed) :

db.Database.ExecuteSqlCommand("delete from SupportRegion where UserId={0} and CategoryID not in ({1})", userItem.UserId, String.Join(",", userItem.ListItemId)); 

How can I make it possible in defining parameter as an array of integer?

thanks a lot