|
|
 |
BOOK: Beginning ASP.NET 4 : in C# and VB
 | This is the forum to discuss the Wrox book Beginning ASP.NET 4: in C# and VB by Imar Spaanjaars; ISBN: 9780470502211 |
Welcome to the p2p.wrox.com Forums.
You are currently viewing the BOOK: Beginning ASP.NET 4 : in C# and VB section of the Wrox Programmer to Programmer discussions. This is a community of tens of thousands of software programmers and website developers including Wrox book authors and readers. As a guest, you can read any forum posting. By joining today you can post your own programming questions, respond to other developers’ questions, and eliminate the ads that are displayed to guests. Registration is fast, simple and absolutely free .
|
 |
|
|
 |
December 21st, 2010, 05:16 PM
|
|
Authorized User
|
|
Join Date: Nov 2010
Posts: 63
Thanks: 3
Thanked 0 Times in 0 Posts
|
|
Incremental key index
Hello
I'm looking for a way to create an unique index number (ID number) that increments with every row added, and will not be reused even if a row is deleted. In Access there is a handy function (AutoNumber).
Thanks.
|
December 21st, 2010, 05:20 PM
|
 |
Wrox Author
Points: 72,055, Level: 100 |
|
|
Join Date: Jun 2003
Location: Utrecht, Netherlands.
Posts: 17,086
Thanks: 80
Thanked 1,587 Times in 1,563 Posts
|
|
Hi there,
Take a look at page 423 and further and the accompanying exercise.
Cheers,
Imar
|
December 21st, 2010, 05:28 PM
|
|
Authorized User
|
|
Join Date: Nov 2010
Posts: 63
Thanks: 3
Thanked 0 Times in 0 Posts
|
|
New Yellow Screen of Death
Now I get the following error:
Operand type clash: uniqueidentifier is incompatible with int
Here is my code
Using myentities As New abeolEntities
Dim user As tbl_user
user = New tbl_user
user.firstname = myControl1.Text
user.lastname = myControl2.Text
user.username = myControl3.Text
user.email = myControl4.Text
user.date_added = DateTime.Now
myentities.AddTotbl_user(user)
myentities.SaveChanges()
End Using
The site crashes at the line myentities.SaveChanges().
The Id field is an int, as Identity defined.
Thanks for the help.
Last edited by avidan; December 21st, 2010 at 05:36 PM..
|
December 21st, 2010, 06:02 PM
|
|
Wrox Author
Points: 72,055, Level: 100 |
|
|
Join Date: Jun 2003
Location: Utrecht, Netherlands.
Posts: 17,086
Thanks: 80
Thanked 1,587 Times in 1,563 Posts
|
|
Maybe you changed the type of a column in the database after you created the EF model? If so, try recreating the model.
Cheers,
Imar
|
December 21st, 2010, 06:37 PM
|
|
Authorized User
|
|
Join Date: Nov 2010
Posts: 63
Thanks: 3
Thanked 0 Times in 0 Posts
|
|
Complicated
Your tip helped. But all seems to be so complicated, coming from VB6!
|
December 22nd, 2010, 05:21 AM
|
|
Wrox Author
Points: 72,055, Level: 100 |
|
|
Join Date: Jun 2003
Location: Utrecht, Netherlands.
Posts: 17,086
Thanks: 80
Thanked 1,587 Times in 1,563 Posts
|
|
Well, yes, some of it is more complicated and some of it fortunately only looks more complicated.
Once you get the hang of Entity Framework, I think you'll appreciate how easy it is to do data access without writing a lot of manual code.
Good luck; I am sure it's worth it....
Cheers,
Imar
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
|
All times are GMT -4. The time now is 06:23 AM.
|
