Visitor Visa - B2

Hi, today 3-Nov. I have another appointment in Dubai US Consulate .. My first try in 6-OCT-2016 and for less than one month I make the second try Hoping That I will Pass . But Not . :-(

Me: Good Morning
VO: Good Morning . Can I see your Passport, please

Me : Yes
VO : Why you want to Travel to the USA ?

Me : I want to attend an Expo in Las Vegas for just six days and Please I have an invitation letter you can see it ( I pass through the opening under the window but she doesn't look at it ?!)
VO : Ok ( And she look in the computer reading - I think - my application ) and she is playing with her hair .. then ask me : For how long you are in Dubai :

Me: Around Nine years and three months

VO: Are You Married ?
Me : Yes Just From Two Weeks

Vo : What you work ?
Me: Mechanical Engineer

Vo: What the name of your Company :
Me: Answered

VO: So Your application is rejected last time Can you tell me what changes become for the second one :
Me: I m now married just before two weeks which my Ties become stronger .

VO : Sorry You do not qualify under US law for VISA
Me : OK Thanks

Really Bad and this time are Shorter than my first try .
The problem That I want to attended the Expo ??????????

From The color of the sheet I can know which one is rejected - approved-pending and I can say 70% of appointments are rejected