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It couldn't do that because your table that holds the "Address" field doesn't have a primary key defined in it. You need a column that will uniqely identify each record in the table. See this[^] little page for a description of Primary Keys.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Thanks dave;)
Beginner in ASP.Net and VB.Net
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This seems to be very simple, But... (new to vb.net)
I have a form with a tabcontrol with 2 pages. One page has a grid with sales entries. The other page has textboxes on it with the values form the table. I have a recalc button that calculates the salesman commission. It works great until I manually change the commission percentage in the textbox or any other textbox value. The calculation works ok, but the commission textbox does not show the new calculated value. If I click on the other tab and then click back to the detail page the value appears. If I change the commission percentage value through the use of a button it works fine! This must be something really basic I'm doing wrong. Do I need to valiadte and manually write text back to commission box? Help Please!
' dataset = dsSalesFile
' table = SalesFile
' After data is selected I bind as follows:
txtSalesTotal.DataBindings.Clear()
txtSalesTotal.DataBindings.Add("Text", dsSalesFile, "SalesFile.SalesTotal")
txtCommPcnt.DataBindings.Clear()
txtCommPcnt.DataBindings.Add("Text", dsSalesFile, "SalesFile.CommPcnt")
txtCommission.DataBindings.Clear()
txtCommission.DataBindings.Add("Text", dsSalesFile, "SalesFile.txtCommission")
'Subroutine to recalc
Dim CurPosition As Integer
CurPosition = BindingContext(dsSalesFile, "SalesFile").Position
Dim WorkRow As DataRow = dsSalesFile.tables("SalesFile").Rows(CurPosition)
WorkRow ("Commission") = Math.Round(CDec(WorkRow("CommPcnt")) / 100 * CDec(WorkRow("SalesTotal")),2)
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Hello,
I created a small program to show some data in a datagrid. There are about 100 records but the datagrid has no scrollbars so you can't see all te records.
What can i do?
I fill the datagrid up like this:
Dim connStr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\films.mdb"<br />
OleDbConnection1 = New OleDbConnection(connStr)<br />
OleDbConnection1.Open()<br />
myDs = New DataSet<br />
sqlStr = "SELECT * FROM films"<br />
OleDbDataAdapter1 = New OleDbDataAdapter(sqlStr, OleDbConnection1)<br />
OleDbDataAdapter1.SelectCommand.CommandText = sqlStr<br />
oleDbCommandBuilder1 = New OleDbCommandBuilder(OleDbDataAdapter1)<br />
OleDbDataAdapter1.Fill(myDs, "dtFilms")<br />
currentRow = 0<br />
<br />
Dim tableStyle As DataGridTableStyle<br />
tableStyle = New DataGridTableStyle<br />
tableStyle.MappingName = "dtFilms"<br />
dtgFilms.TableStyles.Clear()<br />
dtgFilms.TableStyles.Add(tableStyle)<br />
dtgFilms.DataSource = myDs.Tables("dtFilms")
Thanks in advance!
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VB6 COM component uses .NET libraries. One .NET library tries to
locate folder in the app's directory with its data. There are
two clients of vb6 component: vbscript and vb6 late binding,
both are essential.
If the VB6 built as ActiveX.EXE, .NET library fails to locate
its folder (with both clients of ActiveX), if built as ActiveX.DLL,
library fails only with VB6 late-binding client, with VBScript all
goes Ok. .NET clients of the same .NET library have no problems
with it; users have necessary permissions...
I'm going slightly mad...
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Your component is assuming that it's data directory wil be a sub-directory of the current directory. This is bad practice because you can't guarantee that the current directory is the one that the app is launched from. Try to code your component to get the applications path first, then parse it up and add the subdirectory to that path. This should point you to the correct directory every time, instead of making assumptions about what directory your running in. you'll have much better luck if you specify a complete path to your files instead of a partial path.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi,
Can anyone help me. I have a function that will let you select any of the drives on the system but all i want is to be able to select the cd-rom/dvd-rom drives.
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Hello frnds,
there is a problem here, I have a datagrid when i add a new record to the grid and press save button it saves, After saving if i refresh the page the record is saving again - i mean a duplicate record is getting saved in the daatbase after refresh. Can any body help me in this regard
thanx in advance
irsh
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You'll have better results if you post your question in the ASP.NET Forum. Also, I'll tell you that it very much depends on how your code is written wheather or not this will be an easy fix. Post you question and database/datagrid handling code in the ASP.NET Forum for better results to your problem.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi,
I know a little about multi-threading in vb.net
I know that we can execute a procedure on a new thread by using:
<br />
Dim t as New Thread(AddressOf proc)
"proc" should be of the form :
<br />
Sub proc()<br />
'code...<br />
End Sub<br />
Can i make proc a sub with arguments?
like this:
<br />
Sub proc(str as String)<br />
'code...<br />
End Sub<br />
and call proc on a new thread and specify str?
I mean something like:
Dim t as New Thread(AddressOf proc("hello"))
If yes, how?
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Sub that starts a thread can't have arguments.
You should set some kind of property or field before start the thread and use it inside.
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ThreadStart's can't have arguments. Normally, you would put this code into a class, along with some public fields that would represent the parameters for this method you want to start. Then you create and instance of the class, set the fields to the values you need, create your ThreadStart object and point it at the method in your instantiated class, then run it. The method would have to pick up its parameters from the public fields you set in its class.
Public Class MyThreadClass
Public argument1 As Integer
Public Sub MyMethod()
Dim whatever As Integer = argument1
.
. your method code...
.
End Sub
End Class
' Code in your calling class.
Dim mtc As New MyThreadedClass
mtc.argument1 = 30
Dim t As New Thread( AddressOf mtc.MyMethod )
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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You could use a delegate then invoke it asynchronously. Delegates can take arguments unlike threads.
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Can you please give me a short example? What is a delegate?
I would apreciate your help.
Thanks in advance
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guys,
im developing a ping plotting app, which will run on a centrallised server & ping a particular URL continuously for checking its availability. now i want to create a browser based I/F for that exe app to view reports & add some remarks against a particular entry. so, the admin shud be able to access it from anywhere for the above ops. please suggest how i cud do that?
DaHacker Loves Hackin!
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This would just be ASP.NET Web project. Nothing special there. You'll need to have IIS or the Personal Web Server running on your machine that'll be serving up the web pages and doing the pinging.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi! All
I'm doing an applicaiton using with vb.net. I need t o convert double bytes Hex string into single byte hex(binary) and send to the server. Anyone would help me how to do in vb.net
thanks in advance
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Convert Double Byte Hex to Single Byte?
Are you talking about converting a UniCode string to ASCII?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hello Anybody please help these poor student in india
i want to create a datagird with Adding updating and deleting options in the windows forms with vb.net. If any good persons with good mind to help me please help me
with lot of pary and hope
rajeev
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Hi all,
I am new to vb.net. How can I print a file (txt, doc) without opening the file(send the file to printer and have the printer print it). I have try to search for quite sometimes but most of the code i get is not working or just I do not know how to use it.
Please help me
Thanks you so much.
Regards
Hendrik
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.NET Framework Class Library
PrintDocument Class
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemDrawingPrintingPrintDocumentClassTopic.asp
.NET Framework Class Library
PrintDialog Class
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformsprintdialogclasstopic.asp
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Hi there,
thank for reply. But, it will not work if i need to print a pdf file. Actually i run a console application, so, is there anyway for me to print the pdf file without the Prindialog box appear.
Thanks
Regards
Hendrik
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OPEN "LPT1" FOR OUTPUT AS #1
PRINT #1, "Hello World!"
CLOSE #1
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Hi,
I've been trying to get more than one checkbox column in VB6's Listview control, but have not succeeded. It does not appear to be possible without a serious amount of messing around.
I have also tried Mabry's List control and FarPoint's List Pro 3, but both do not allow any checkbox columns.
The only control I have found so far that will let me have more than one is FarPoint's Spread, but at US$499 it's a tad pricey just to get some checkboxes...
Alternative listview control suggestions appreciated. Thanks,
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