Sql table update from one table to other table based on Primary key (ID match both table)

Sql table update from one table to other table based on Primary key (ID match both table)

We have 2 table custmain & custdetail I want update custmain email ID by custdetail emailID.

UPDATE  Custmain

SET

    Custmain.EmailID = CD.uEmailID,Custmain.Name=CD.Fname

FROM

    Custmain as CM

INNER JOIN

    CustDetail as  CD

ON 

    CM.Csid=CD.CsIDU