How to check if SQLDataReader has no rows

Question

I am trying to figure out how to check if my SqlDataReader is null or has no rows (meaning the reservation does not exist) and then display a messagebox. For so

Answer 1

Add this to your code to check:

sqlCommand cmd = new sqlCommand();
SqlDataReader dr = cmd.ExecuteReader();

if(dr.HasRows)
{
    while(dr.Read())
    {
        //code
    }
}