c# - How to pass absolute database name,server name as parameter? -


i have requirement need select data database db1 , insert database db2. 

update [server1\sqlexpress].[db1].dbo.table1 set cname = (select cname               [server2\sqlexpress].[db2].dbo.table1                 cid = 3)

so above script working fine.

now want pass 

[server1\sqlexpress].[db1] [server2\sqlexpress].[db2]

as parameters, because server name , database can different in real time environment.

can tell me how achieve below goal?

create procedure     @cid numeric,     @servername1 serverdatatype,     @servername2 serverdatatype,     @dbname1 dbdatatype,     @dbname2 dbdatatype      update @servername1.@dbname1.dbo.table1     set cname = (select cname                   @servername2.@dbname2.dbo.table1                     cid = @cid)

try in fashion:

declare @servername1 varchar(max) = 'myserver' declare @db1 varchar(max) = 'mydb'  exec('update   ' + @servername1 +  '.' + db1  + '.dbo.table1       set cname= (select  cname ' + @servername1 +  '.' + db1  +                              '.dbo.table1'     cid ='+ @cid)

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