How to merge tables of a database in c#?

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I have two tables in SQL server database. The first one(db1) contains information such as username, password, address, phone no etc and the other one(db2) contains information such as username, education, key skills, hobbies etc. The username is the common key between the two.
Ive made two pages in asp.net website for registration. First one has a form with fields username,password, address, phone no. The second one has a form with fields as education, key skills, hobbies. The code is in C#.In the code behind(C#) of second form, I want to compare that if the username from db1 is equal to username from db2, then fill in the details in the table2(db2). How to accomplish this task ? Help!!!
Thnks

Posted 10-Oct-11 21:54pm

angel 2

Updated 11-Oct-11 0:02am

v3

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2 solutions

Solution 1

You can query another database within another database connection with the following code:

SQL

select * from database2.dbo.tablename -- execute from database1 connection

Posted 10-Oct-11 22:18pm

Mehdi Gholam

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angel 2 11-Oct-11 5:22am

thank u so much :)

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Simon_Whale · Accepted Answer · 2011-10-10T22:28:00

AS you are using SQL Server I would pass the information to a stored procedure and then using T-SQL I would do

1. Compare the usernames from the 2 databases i.e.

SQL

declare @UserName VARCHAR(50) = null

select @UserName = a.username
--tableName is the name of the table in database1
from tableName b inner join database2.dbo.TableName b
on a.username = b.username

2. If the name exists in database 2 then do the insert

SQL

if @UserName is not null
begin
 insert into database2.dbo.tablename
 select columnnames
 from tablename
end

Further Reading
Create Stored Procedure[^]

Calling Stored Procedure using ADO.NET[^]
This article is in C# but it is very easy to convert