2 things I can think of: 1. What is data type of h? 2. Is the result "Hits from Admin" null if you run the query (like in SQL query analyzer or Management studio)?
I would try something like this
int iHits = 1;
if (dr["Hits"] != DBNull.Value) {
iHits += Convert.ToInt32(dr["Hits"]);
}
//if you need string...
string sHits = iHits.ToString();
Syntax is mostly correct c#, just check spelling / case if there is problem.