I was denied an H1B visa last year if I apply again this year will I go through lottery again?

Yes, unless your sponsor is a cap-exempt employer, your H-1b petition will be subject to the cap.

EB2 - Permanent Residency Qualification

As long as the minimum requirements for your job are at least a bachelor's degree and 5 years of experience, and you can document 5 years of...

Your labor certification/PERM is for a specific job in a specific location. Your approved PERM will not be applicable to the new work location. ...

Can I still use my maiden name when filing for my husband (spouse visa)

Using your maiden name does not cause a problem when filing the I-130 for your husband.

Resignation on L1B

An employer cannot prevent you from resigning and leaving the U.S. However, if you have an employment agreement with them, there may be consequences.

My spouse is here on a B2 Visa, refused to leave me alone. I want to divorce her in Pakistan, will it be valid in the USA?

This is not an immigration issue. Will repost to divorce.

Can I extend my O-1 visa with the same sponsor company, but different representative for my petition.

Yes, if the sponsor/petitioner of your O-1 is a company, any person within the company, authorized to do so, can sign the documents.

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I am a green card holder/ permanent resident in the Us. How can I bring my Canadian fiancé here?

As a green card holder, you cannot sponsor your fiancé. You can either get married and then sponsor him, which will take approximately 18 months,...

Am i required to get a new stamp(H1B) due to employer change?

No you do not. You can use the H-1b visa from your earlier employer after you have changed H-1b employer's, through the validity of that visa.

Can I apply for citizenship if my green card approval is still pending for more than 3 years married to a US citizen?

You can only apply form citizenship based on marriage to a U.S. citizen after your green card has been approved and you have been a green card...