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Is it a console app ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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I need the button disappear after 5 second the window form is load, how i do this ?
Chee ken
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First of all there is no relation between your subjectline and problem.......
Whatsoever...
Take a global timer variable say myTimer as ....
Dim WithEvents myTimer As New Timers.Timer
then....put this code in your form load event..
With myTimer<br />
.AutoReset = True<br />
.Interval = 5000<br />
.Start()<br />
End With
finally write following code in Timer's Elapse event like...
Public Sub myTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles myTimer.Elapsed<br />
Button1.Visible = False<br />
myTimer.Close()<br />
End Sub
Tirtha
"A man can ride on your back only when it is bent....."
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Cross-thread operation not valid: Control 'Button1' accessed from a thread other than the thread it was created on.
Why have this error point to "Button1.Visible = False" this line ?
Regards,
Chee ken
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it is not at all any coding problem.......it works fine....but check what you are doing with that particular button...whether any other process is calling or referencing your control or not....
see here..........
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=9756&SiteID=1[^]
Tirtha
"A man can ride on your back only when it is bent....."
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The code posted uses the Timers.Timer object which runs on a separate thread. Trying to change UI elements like visibility of a button will generate a cross thread error. It's unsafe to access controls from a thread that didn't create that control. Instead try using the forms.timer.
Dim WithEvents myTimer As New Windows.Forms.Timer
Public Sub myTimer_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles myTimer.Tick
Button1.Visible = False
myTimer.Stop()
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
With myTimer
.Interval = 5000
.Start()
End With
End Sub
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hello,
i'm asma i wana to ask how can i view the updates that happened on the controls, such as i have a data grid view and i change some of its content and wana to see the update on this datagridview in label or text box that shows the user name who made this update or the date of the update.
please if any one have solution replay.
thanx alot.
asma
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This is only possible if you store this kind of information in your database yourself. You'll have to update your tables schema to store this stuff. There is currently no database that does this automatically.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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I am using MSFlexGrid control in Window Form application in VB.NET.
I need to position an image on my flexgrid according to the colposition.
I am using get_colpos method and it returns the column position in pixels (I think). I need to convert this value to Point (I think)
Thanks
Eric H.
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You are most likely getting the co-ordinates relative to the wrong thing. There are ScreenToClient and ClientToScreen methods on your form to convert between the two.
A Point is just two numbers. A Point that represents a screen location will be in Pixels.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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(vb.net)textbox accepting only numeric data using keypress event and keydown event
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call a function say checkForNumericInput(e) in textbox's keypress or keydown event with the event argument parameter e.......the code is as follows.....
Private Function checkForNumericInput(ByVal e As System.Windows.Forms.KeyPressEventArgs)<br />
If Not (Char.IsDigit(e.KeyChar) Or Char.IsControl(e.KeyChar) Or e.KeyChar = ".") Then<br />
e.Handled = True<br />
MsgBox("PLEASE INPUT NUMBERS ONLY", MsgBoxStyle.Critical, "NO CHARACTERS!!!")<br />
End If<br />
End Function
hope it will be helpful....
-- modified at 4:22 Thursday 22nd March, 2007
-- modified at 4:23 Thursday 22nd March, 2007
Tirtha
"A man can ride on your back only when it is bent....."
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I am working with vb.net &sqlserver 2000. How to connect to sqlserver through vb.net.It gives me problem.can anybody give me some code as example.
shrikant
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Imports System.Data.SqlClient
Dim MyConn As SqlConnection
Dim MyComm As SqlCommand
Dim MyDr As SqlDataReader
dim strConn as string = "server=mypc;uid=sa;pwd=a;database=fac;"
MyConn = New SqlConnection(strConn)
MyConn.Open()
MyComm = New SqlCommand("SELECT * FROM tbl1", MyConn)
MyDr = MyComm.ExecuteReader
Do While MyDr.Read()
Loop
Regards
KP
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I get this code from Dave Kreskowiak in the past:
This code show how to open a PDF file from a CD Rom
Dim appPath As String = Application.StartupPath
Dim pathToPdf As String = Path.Combine(Path.GetPathRoot(appPath), "PDF\PDFName.pdf")
DIm proc As Process = Process.Start(pathToPdf)
Someone can tell me what is Path variable, I get an error message that is not declared.
Thanks.
Eric H.
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It's not a variable, it's a class.
Import the System.IO namespace.
---
single minded; short sighted; long gone;
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Path is a class. Did you forget to include System.IO namespace?
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i have a requirement of closing window
but it should be done in such a way that
it will have one window with a button.
when i press the button it should open another child window
and close the parent window
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If you will close your main form, the application will stop. You will have to hide the parent form each time. By the way, what kind of requirement is this ? Isn't it seem to be unsual ?
"A good programmer is someone who looks both ways before crossing a one-way street." -- Doug Linder
coolestCoder
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actually its not a requirement. i was practesing .my another doubt may sounds carzy.
is it not possible to trasnfer the main control from form to form so that i can close the parent window and continue to use the child window
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The best way to do this, is to write your two forms as controls, and host them both on the one form.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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I am developing a database application in vb.net 2005 /ms access using ADO.Net using OLEDB. I have a couple of independent forms.In all the forms I have code that queries the data in the database.So, I have used the "Imports System.Data.Oledb " statement in all the forms.Is there any other way I can import the Oledb class so that it is imported once and stays active throughout the execution of the program and the methods of the ADO.net library are available from all the forms.Like we did in VB 6.0 using a module?
Also, I am using a couple of Dll import functions in my app using the DllImport statement.As for the Dlls also ,I have used the same DllImport statement in all the forms that calls the functions.Are there any performance issues associated with this kind of a design? Can we import the libraries once so that the functions are available anywhere from the program like the ADO library I mentioned above? If we do not import the Oledb library in all forms, it will result in a compilation error.Thanks in advance...
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It sounds you like you really need to take a look at redesigning your app as n-tier. Use a UI layer for your forms, and a common data layer for all of your data access. You could probably benefit from putting a business logic layer between the two also.
You can read more on the concepts here[^].
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hello everyone!
I have a question that I have been trying to solve and I can find a solution, if you know please share you wisdom!
I'm making a DLL that will be used by a ASPX page, this is not an ASP.NET application, just a DLL loaded by the page.
very simple, ControlLibrary code:
Namespace hello_world
Public Class cHello
Public ReadOnly Property sayhello() As String
Get
Return "hello"
End Get
End Property
End Class
End Namespace
page code:
<%@ Page Language="VB" Explicit="False" %>
<%@ import Namespace="hello_world" %>
Dim aHello As cHello
Sub Page_Load(Sender As Object, E As EventArgs)
aHello = New cHello()
End Sub
!!!!!<%=aHello.sayhello()%>!!!!!!!!!
Not much and it works, the only problem I can't debug it. when I put the break point on
Public ReadOnly Property sayhello() As String
nothing happens, I get my hello on the page but it does not stop...
as far as I could find it there use to be an option in studio 2003 called "Enable ASP.NET debugging" but I can't find in 2005.
Does anyone knows what I need to do? please help!
Thank you
ipokrov
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