How to make key foreign in c#

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hi friends, i m bishnu
i have a project and i want to make a foreign key which is primary key in another table

like.......... one table has table name tblEmployee where Employeeid is primary key and i have another table tblAttendance where Employeeid is wished to be made foreign key. i am using sqlserver express 2005. please help with query or code as soon as possible?

Posted 25-Oct-11 1:11am

bishnu karki

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Sander Rossel 25-Oct-11 7:13am

Are you asking about C# or SQL? C# does not have Primary Keys or Relations. Please be specific.

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phil.o · Answer 1 · 2011-10-25T01:20:00

Hi,

The solution lies in SQL, not in c#.

You can add a foreign key to your field this way :

SQL

ALTER TABLE [tblAttendance]
ADD CONSTRAINT [FK_tblAttendance_tblEmployee]
FOREIGN KEY [Employeeid]
REFERENCES [tblEmplyee] ([Employeeid])
ON DELETE NO ACTION ON UPDATE NO ACTION;
GO

It is advised to also put an index on your foreign key :

SQL

CREATE INDEX [IX_FK_tblAttendance_tblEmployee]
ON [tblAttendance] ([Employeeid]);
GO

Abhinav S · Answer 2 · 2011-10-25T01:26:00

Solution 2

If you are talking about DataRelation objects, then check this[^] out.

If you want to do this through code (for a table), then this forum discussion[^] should help you out.

Posted 25-Oct-11 1:26am

Abhinav S

Mantu Singh · Answer 3 · 2011-10-25T03:00:00

Have you created the table already if no use this when you create it.........

Try this query

create table tblAttendance
(
Employeeid data_type foreign key refrences tblEmployee(Employeeid),
other_col data_type
)

In case table is already created use alter table as suggested by Mr philo
and try links provided by Mr Abhinav
Best of luck........

How to make key foreign in c#

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