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Ok, I did up a small sample app to demonstrate how to get this right. Here's how I did it.
I started off by creating a form with 3 textboxes to input data to the dataset (I chose "Name", "Product" & "Quantity" as fields for the dataset), and 2 buttons for "Add to dataset" & "View report".
I created the dataset (called dsQuote) and declared it at modular level in Form1 (Friend ds1 As New dsQuote)
I created a second form and added a Crystal Report Viewer to it (called "crv")
I added a new Crystal Report to the solution and used the Report Expert wizard to select the dataset i created earlier.
I set the solution start up object to call Sub Main().
Then I just tied it all together with a bit of code - have a look at the code below.
SubMain
Module modMain
Public WithEvents frm1 As Form1
Public WithEvents frmR As frmReport
Sub Main()
frm1 = New Form1
Application.Run(frm1)
End Sub
End Module
Code on Form1
Friend ds1 As New dsQuote
Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
Dim dr As DataRow = ds1.tblQuote.NewRow
'add info to dataset
dr.Item("name") = txtName.Text
dr.Item("product") = txtProduct.Text
dr.Item("quantity") = txtQuantity.Text
ds1.tblQuote.Rows.Add(dr)
'clear the textboxes
txtQuantity.Clear()
txtProduct.Clear()
With txtName
.Clear()
.Focus()
End With
End Sub
Private Sub btnReport_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReport.Click
frmR = New frmReport
frmR.Show()
End Sub
Code on Form2
Public rptQ As Quote
Private Sub frmReport_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
rptQ = New Quote
rptQ.SetDataSource(frm1.ds1)
Me.crv.ReportSource = rptQ
End Sub
That should solve it for you. 
EDIT: Sorry for the crappy naming conventions, I was in a bit of a hurry.
-- modified at 3:59 Friday 18th August, 2006
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Hi kulazfuk,
Awesome sample, it works! Not quite what I was expecting, and I guess I need to create a blank xsd for it..but it works and thats all that matters. Thanks a lot for your help
eatwork
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sorry, ignore the last post, starting to confuse myself. Thanks again
eatwork
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Hey I'm very new to this so please forgive me. What I'm trying to do is send text to a text box without having the user click a button. What I want to do is this; I have a very small basic program that takes user input from different text boxes, drop down list, etc and creates a .txt file. I have a button on a separate tab that when clicked will give them a preview of what they have picked in the various locations. What I want to do is an instant send once they click the information in the text boxes, drop down, list boxes, etc... What do I need to do to accomplish this?
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All controls have a collection of events that you can handle.
For example, you could use the TextChanged event for a textbox and SelectedIndexChanged for a combobox.
Steve
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Thanks to reply Kereskowiak,
Actually i want that my project should work like "Trial Versions" does.
If project is installed on one machine then it should expire itself after 10 days of installation.
if someone try to install it again after changing the system date then it should check that, has project been installed on same machine before or not? if yes then it should stop installation.
I want to do such stuff for Piracy point of view of project.
Waiting for solution.
Regards,
Syed Ali Raza Rizvi
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Syed Ali Raza Rizvi wrote: Thanks to reply Kereskowiak,
His name is Dave, and you should respond on the same thread, so he can see it and so it's in context.
Syed Ali Raza Rizvi wrote: Actually i want that my project should work like "Trial Versions" does.
Then you need to store some info somewhere that is hard to find, and that shouldn't be the registry IMO.
The only way to do this so that there is little chance of a determined user to crack it is to do something user hostile, like hide files in the System32 folder to track the dates.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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The Registry is always the first place people look in when trying to "break" your program.
To protect your programs, You could have a look at my article here :
http://www.codeguru.com/vb/gen/vb_general/ideincludingvisualstudionet/article.php/c11817/[^]
In there (the second page) I create a Trial Application ,storing a counter variable in a "system" file. Then, when the counter reaches a certain number, the person cannot continue.
Hope that helps!
H T G
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I'm trying to use the WebClient.DownloadData method running on two threads at the same time. This sometimes produces an interrupt if both threads try to run it at the same time (the method can only run on one thread at a time). How can I best synchronize, for instance by getting one of the threads to wait until the other is finished downloading?
thanks!
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You could use thread polling, Thread.Join or Wait handles.
Search your help file for one of the above.
Steve
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I think I wasn't real clear... I have the 2nd thread in a backgroundworker. Can I use those techniques in this case? Do I need to determine the thread name of the backgroundworker?
Thanks
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They are competing with the same resource?
Link them both to the same 'Wait handler', then one will wait for the other to complete.
Steve
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Hi again.
Can you give me an example of the "wait handler" code? I'm trying to sort this out.... but I'm not too good at it!
I have my primary thread running.
Then I call a secondary thread (backupworker)
They both keep running continuously, and they both need to call
WebClient.DownloadData() at random intervals.
I put the webclient call in a function (Myfunction), so that both threads call the same function. Is this OK?
It looks to me like what I want are:
System.Threading.Monitor.Enter(Myfunction)
System.Threading.Monitor.Exit(Myfunction)
But I don't know exactly where to put them, or if this is right.
Thanks so much for your help!
chuck
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What you ask is quite complicated and depends on exactly what you are trying to do and how you are doing it. Since I don't know your application or your code structure, it is difficult to advise the best method to achieve what you desire.
I really would suggest that you search your help file for information on thread pooling, thread.join and wait handles. You need to understand what you are doing and how relevant it is to what you are trying to achieve.
Giving you the code will not teach you anything and since I don't know your application, may not be the best way to get the results you desire.
Steve
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If all you are trying to do is ensure that only one thread can execute your method at any given time, the easiest solution would be to prefix the method definition with the MethodImpl attribute.
For example:
<methodimpl(methodimploptions.synchronized)> _
Public Function MyFunction as foo
'Function functionality coded as normal
End Function
This attribute ensures that only one thread may execute the method at any given time.
You could also use SyncLock to achieve the same result:
Public Function MyFunction as foo
SyncLock Me
'Function functionality coded as normal
End SyncLock
End Function
Any code within the SyncLock block can only be executed by one thread at a time.
Hope this helps.
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Keith... perfect! .... you are the MAN! thanks again!
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I modified the column structure schema of my database. This update is reflected OK in the database explorer. But it is not represented in the dataset designer. My program seems to think the old column structure is still in place. How can I update the column structure?
ty!
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You probably need to use the XML Designer and update the schema of your dataset.
Steve
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Steve.. I think you helped me, because I discovered that I needed to...
go to datasources, right click on dataset and open the dataset configuration wizard.
DO NOT TRY TO EDIT THE DATASET YOURSELF!!! DISASTER!
thanks
chuck
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I am trying to build an interface that returns a datetime data field using an OleDbDataAdapter. The CommandText used by the SelectCommand is "SELECT Punch FROM TIME_POST_WORK". If I run this query from within Query Builder the data returned is "6/19/2006 12:57:58 PM". However, if I try to fill my dataset by using the Preview Data assoctiated with the OleDbDataAdapter, it only returns "6/19/2006". I need to return the value as a DateTime, not just a Date only. I am using Visual Studio .NET 2003 and I get the same results if I am hitting an Access database or a SQL database.
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Can you supply some of your code?
How are you testing what is in your DataSet?
Steve
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Here is the Code that I am using. It contains 2 other fields in the query as you can see, but that shouldn't affect how the DateTime (Punch) is displayed.
This code was generated by VB:
'OleDbSelectCommand1
'
Me.OleDbSelectCommand1.CommandText = "SELECT Clock_Nbr, Punch, Seq_No FROM TIME_POST_WORK ORDER BY Punch"
Me.OleDbSelectCommand1.Connection = Me.OleDbConnection1
This is the code that I used to fill the Dataset and attempt to save back to the database:
Private Sub btnOpen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOpen.Click
OleDbDataAdapter1.Fill(DataSet11, "Time_Post_Work")
End Sub
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
OleDbDataAdapter1.Update(DataSet11)
As for testing my DataSet, in the Properties Window associated with the OleDbDataAdapter, I am clicking on the elipse next to the CommandText for the SELECT statement. This brings up a Query Builder window that contains "SELECT Clock_Nbr, Punch, Seq_No FROM TIME_POST_WORK ORDER BY Punch". I am running this query and it displays 'Punch' as a DateTime. If I use the Data Adapter Preview window the 'Punch' field only displays the Date.
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I'm quite confident that the data is present in the data adapter, and that it's the preview window that is showing only the date part.
DateTime values are almost never shown in a format that reveals the full resolution. A DateTime value has a resolution down to 0.0000001 seconds, but you never see seconds displayed with seven decimal places, do you?
---
b { font-weight: normal; }
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That may be true, but for my purposes, I need to display both the Date and Time. I don't necessarily need the seconds, but I do need the hours and minutes. How can I force the display of date and time?
Thanks
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How are you placing this value on your form?
In a textbox?
What is the code you are using to do this?
As Guffa says, it is there...
Steve
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