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Hello !
i have a sql server 2008r2 database ( stu) with a table (st) with these columns :
stID - identity (int autoincrement value)
name - char(10)
com - char(20)
i have a project in vb.net 2010 , and i have generated entity framework model with the database.
I have a form with a listbox and 2 textbox , and 2 buttons Addrecord and Saverecord.
The listbox is bound with an object from entity (stBindingSource) and displayMember: name , Valuememeber : stID. The form is also binded with stbindingsource. ( textbox1:name , Textbox2: com)
I want to add new record.The code is :
……-----------------------------------
Dim stu As stuEntities
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
stu= New stuEntities
stBindingSource.DataSource = stu.sts
End Sub
---------------------------------------------
Private Sub Addrecord_Click(sender As System.Object, e As System.EventArgs) Handles Addrecord.Click
stBindingSource.AddNew()
End Sub
-------------------------------------------------
Private Sub Saverecord_Click(sender As System.Object, e As System.EventArgs) Handles Saverecord.Click
stBindingSource.EndEdit
stu.SaveChanges(System.Data.Objects.SaveOptions.None)
End Sub
So ,first i click to "Addrecord" , and after i fill the 2 textbox , i click Saverecord.
The first record is saved with no problem.If a add another record , the record is saved , but when I open the table on database , the first record is saved 2 times , the second record is saved 1 time.
I try to add 3,4… records and everytime the last record is saved 1 time the others are all duplicated
If I call stu.SaveChanges() , with no parametres , I can’t add any records because I get an error :
The changes to the database were committed successfully, but an error occurred while updating the object context. The ObjectContext might be in an inconsistent state. Inner exception message: AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager. Make sure that the key values are unique before calling AcceptChanges.
Please help me.
Thank you.
modified on Monday, August 29, 2011 9:41 PM
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Hello!
I've got a piece of code where I need to parse a XML-file and store the data in a DataTable do modify and use the data from the file. I'm a bit stuck on the SelectNodes method.
If I have a XML file that looks like this:
="1.0"="utf-8"
<MASTER.DATA>
<Envelope>
<MessageId>146413</MessageId>
<MessageType>DataExport</MessageType>
<Version>1.0.0</Version>
<Sender>x4</Sender>
<Created>2011-08-23T00:01:45.2367404+02:00</Created>
</Envelope>
</MASTER.DATA>
The following code works like a charm:
Dim xd As XmlDocument
Dim xnl As XmlNodeList
xd = New XmlDocument()
xd.Load(fileName)
xnl = xd.SelectNodes("/MASTER.DATA/Envelope")
BUT! The file doesn't exactly look like that. The MASTER.DATA actually looks like this:
<MASTER.DATA xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://nnnn.com/schemas/sys/1.0/integration IntegrationDocumentSchema.xsd" xmlns="http://nnnn.se/schemas/sys/1.0/integration">
And all of a sudden I don't get bupkis with the above mentioned code. What am I doing wrong?? 
Any help is greatly appreciated. 
//Jagg
Wexelblats algorithm:
Pick two: 1. Good, 2. Fast, 3. Cheap
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I'm not sure whether the dot in the name of your rootnode is allowed. I'd go for a name without a dot.
<MASTERDATA ..>
(more stuff)
</MASTERDATA> The query below should work;
xnl = xd.SelectNodes("//MASTERDATA/Envelope")Or, to get a specific piece;
xnl = xd.SelectNodes("//MASTERDATA/Envelope[MessageId='146413']")Hope this helps
Bastard Programmer from Hell 
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Hi, thanks for the reply.
However, that didn't work either. It works as soon as I remove all the other definitions (xmlns:xsi, xsi:schemaLocation and xmlns) from the MASTER.DATA (or MASTERDATA) but as soon as they are in the file it goes completely blank. I don't get any errors, I just don't find anything.
Regarding removing the dot (MASTER.DATA) it's probably not possible, this file gets sent automatically from one of our back end systems. 
Wexelblats algorithm:
Pick two: 1. Good, 2. Fast, 3. Cheap
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I have written a code to give a sliding effect to 5 command buttons. It runs fine with default background but when i change the opacity of the form OR put a picture in the background it behaves slower rather much slower than what it does normally. What might be the issue? Any ideas to resolve it. Here is the code.
Public Class Form1
Dim slidevar As Integer = -10
Dim slidevar1 As Integer = -60
Dim slidevar2 As Integer = -120
Dim slidevar3 As Integer = -180
Dim slidevar4 As Integer = -240
Dim delayvar As Integer = -300
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Button1.Location = New Point(-1000, 10)
Button2.Location = New Point(-1000, 80)
Button3.Location = New Point(-1000, 120)
Button4.Location = New Point(-1000, 160)
Button5.Location = New Point(-1000, 200)
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
End Sub
Private Sub Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button.Click
slidevar = 0
slidevar1 = 0
slidevar2 = 0
slidevar3 = 0
slidevar4 = 0
Button1.Location = New Point(-1000, 10)
Button2.Location = New Point(-1000, 80)
Button3.Location = New Point(-1000, 120)
Button4.Location = New Point(-1000, 160)
Button5.Location = New Point(-1000, 200)
Timer1.Enabled = True
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
If slidevar < 65 Then
Button1.Location = New Point(slidevar, 10)
slidevar += 6
If slidevar4 > 65 Then
Timer1.Enabled = False
End If
End If
For delayvar = 1 To 100
Next
If slidevar1 < 65 Then
Button2.Location = New Point(slidevar1, 80)
slidevar1 += 5
End If
For delayvar = 1 To 100
Next
If slidevar2 < 65 Then
Button3.Location = New Point(slidevar2, 120)
slidevar2 += 4
End If
For delayvar = 1 To 100
Next
If slidevar3 < 65 Then
Button4.Location = New Point(slidevar3, 160)
slidevar3 += 3
End If
For delayvar = 1 To 100
Next
If slidevar4 < 65 Then
Button5.Location = New Point(slidevar4, 200)
slidevar4 += 2
End If
End Sub
End Class
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you have already asked this question in QA[^]
What have you tried since then?
Lobster Thermidor aux crevettes with a Mornay sauce, served in a Provençale manner with shallots and aubergines, garnished with truffle pate, brandy and a fried egg on top and Spam - Monty Python Spam Sketch
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Hello !
I'm starting to create a project with Vb.net 2010 and SQl server 2008r2.I don't know what to choose dataset or Entity framework ?
Another question :Are these both compatible with crystal reports ?
Thank you.
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The two choices are not interchangable. You also haven't explained what you're app is going to be doing at all so it's impossible to say.
You're asking "Should I use these two bolts to build my project (DataSet)? Or use everything in this machine shop supply store (Entity Framework)?"
Neither of these has anything to do with Crystal Reports. CR gets its data from the database, not from the objects that make up and manage your data model.
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i try to create a data source on vb.net and there are 2 options : Dataset or Entity Data model ?
So how to decide which is the best choice ?
Someone can describe some avantages and disavantages on both model ?
What i'm going to do ? Usual things that someone can do with database :
Read , Write , Modify , Display , bound controls .... Sometimes with few records (50-10) , sometimes with much more (300-500)....
I read that if i choose one model i should continue with that , and can't use both models.
So what can i do ?
Thank you.
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The "What are you going to do", was more a brief the application would be for.......
Lobster Thermidor aux crevettes with a Mornay sauce, served in a Provençale manner with shallots and aubergines, garnished with truffle pate, brandy and a fried egg on top and Spam - Monty Python Spam Sketch
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this application would be for a school managment (student personal data , results, financial data...
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OK, If you've never used either of these, don't even think of trying the Entity Framework.
Seriously, if you don't know what each of them is, you really don't have the skill set to use either of them. I highly suggest picking up a book on ADO.NET and/or Entity Framework 4.x and work through them. If you don't, you're just going to put yourself through an awful lot of pain and make bad design decisions that will cause your project to fail.
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thank you !
But i have create before a project using dataset.But i have read that entity framework is something new and better than dataset.And of course if entity framework is better than dataset , i will read some books before creating my project.
I want to know if possible some adavntages ( or disavantages ) of entity framework vs dataset ?
Or , if doesn't has importance what i know about both models , if a professionist have to choose : dataset or entity framework ? i like to know if possible your choice.
Thank you.
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There is no "better". There is "appropriate".
What is appropriate for your application depends on your apps requirements, specifications and expected load. If you're doing this for a school project, I would probably suggest using the smaller dataset methods.
Serisouly, we know NOTHING of your application so you are the only one who can make this decision. But, in order to do that, YOU have to understand the capabilities and limitations, pros and cons of each. Pickup a book and start reading.
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ok. Can you suggest a book for beginners in entity framework ?
Thank you.
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I have created a VB.NET app, a small mcq based quiz. Now when i run it on a different resolution than my PC then all the items(labels,textboxes etc) on the form get scattered.
How can we create resolution independent applications?
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Windows Forms in .NET offers a great method variety of Autosizing, Docking and Align properties that should make it easier to get the positioning right for varying resolutions. You'll need to play around with them a bit to get a feel for it.
Alternatively, if these don't offer enough power, you'll need to write your own control-positioning/sizing code in the Resize event for the form.
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Try Anchoring or Docking[^] your controls. Remember, the Anchor and Dock properties are mutually exclusive. Only one can be set at a time, and the last one set takes precedence.
Excuse me for my improper grammar and typos.
It's because English is my primary language, not my first language.
My first languages are C# and Java.
VB, ASP, JS, PHP and SQL are my second language.
Indonesian came as my third language.
My fourth language? I'm still creating it, I'll let you know when it's done! 
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Hi guys
I am busy with a vb application that passes text to Ms Word , How does one specify where the text must be placed
eg. I have a template of a contract , I want the application to search the contract template word document and place the date at a specific place
cheers
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I used a "search and replace" concept to do what you are describing.
1) Use something like [%0], [%1], etc to indicate that you want certain fields replaced in your text with parameters; starting with parameter zero, parameter one, two, etc
2) Now you just invoke your search and replace logic as many times as you need to "merge" the variable data with your "static" MS-Word document.
Seems to work for me. 
Good luck.
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I found this it really helped
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shy boi wrote:
I found this it really helped
What is this? there is no link
You can use bookmarks in Word
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Apologies code block didnt load
Imports Word = Microsoft.Office.Interop.Word
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim objWordApp As New Word.Application
objWordApp.Visible = True
Dim objDoc As Word.Document = objWordApp.Documents.Open("C:\Trydata\1.doc")
objDoc = objWordApp.ActiveDocument
objDoc.Content.Find.Execute(FindText:="VB", ReplaceWith:="Visual Basic Express", Replace:=Word.WdReplace.wdReplaceAll)
While objDoc.Content.Find.Execute(FindText:=" ", Wrap:=Word.WdFindWrap.wdFindContinue)
objDoc.Content.Find.Execute(FindText:=" ", ReplaceWith:=" ", Replace:=Word.WdReplace.wdReplaceAll, Wrap:=Word.WdFindWrap.wdFindContinue)
End While
objDoc.Save()
objDoc.Close()
objDoc = Nothing
objWordApp.Quit()
objWordApp = Nothing
End Sub
End Class
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Hi all...
I have made a program in VB.NET(VS 2008) to start a cmd.exe process using Process class.
Code is running perfectly on 32-bit Windows but when I am trying to run same code on 64-bit Windows 7 it is giving an error message that process file not found.
I compiled code for ANY CPU, x32 and x64 and tested separately on 64-bit OS but getting same error message.
Suggest me what should I do.
Thanks.
Gagan
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