I know this one is basic (and Thanks)
i have a  function that calls a storedprocedure and i'm using the return
code for validation See Below

   public Boolean fn_isVaildUser(string userid, string password)
   {
       // returns 0 invalid or 1 valid for a userid and password
       string constr =
ConfigurationManager.ConnectionStrings["arlcapConnectionString"].ConnectionString;
       SqlConnection sqlcon1 = new SqlConnection(constr);
       SqlCommand sqlcmd1 = sqlcon1.CreateCommand();
       sqlcmd1.CommandType = CommandType.StoredProcedure;
       sqlcmd1.CommandText = "sp_GetUserLogin";
       sqlcmd1.Parameters.AddWithValue("@szUserid", userid);
       sqlcmd1.Parameters.AddWithValue("@szPassword", password);
       SqlParameter isOK = sqlcmd1.Parameters.Add("@isOK", null);
       isOK.SqlDbType = SqlDbType.Int;
       isOK.Direction = ParameterDirection.ReturnValue;
       sqlcon1.Open();
       sqlcmd1.ExecuteNonQuery();
       sqlcon1.Close();
       sqlcmd1.Dispose();
       sqlcon1 = null;
       sqlcmd1 = null;
       if ((Int32)isOK.Value == 0)
           return false;
       else
           return true;
      /// return (Boolean)isOK.Value;
   }
The question has to do with the last commented out line.
I want to just want t ocast and return the "isOK.Value but i keep getting
errors.
ERROR: "Specified cast is not valid."
(It does work as is, but i'd perfer to do it what i consider correctly.)