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Thanks Rizwan. I will check out the information.
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Hi,
I am trying to create a form builder similar to this
http://www.formassembly.com/form-builder.php
First it creates a form. And then it creates sections which are added to the form. And then it creates form elements (Questions) to the sections. I am thinking of doing this using object oriented approach. Is there a specific design pattern that I can follow to code this hierarchy. Please let me know.
Thanks,
Sridhar.
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hi...i hav just one question to ask..
1. how to populate a repeater from array?
2. i had already tried to populate a repeater using arraylist but the prblem is the latest data will overlap the previous data which means in the repeater, it only shows one row of data that is the latest data inserted...
my Question is...how to let the previous data in the repeater remains and the new inserted data will not overlap the previous data and will be displayed below the previous data in the repeater
i hope dat i will get the example of coding..tq so much...
mada mada dane
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Hello:
For past two weeks I am struggling with an issue.
I wrote a VB console application [VB 2005 express]
Every thing is working fine expect the last part
At the end the code suppose to restrict access to a registry key to the “SYSTEM” user
i.e HKEY_LOCAL_MACHINE\Software\ABC_application
DWORD value is “GO”
Data is 3 in hex
I want to restrict “SYSTEM” to ABC_application key, in another words deny access explicitly.
I am referring to ACL permission to registry key, [regedit -> rightclick on regkey…]
Appreciate you help
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Why on earth would you want to do this??
Dave Kreskowiak
Microsoft MVP - Visual Basic
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This is to enforce security of the application. I don’t want any one to change the permission [except Administrator, domain or local].
Especially to prevent abuse from half smart users...
Thanks
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That's nice... Your application won't be able to change anything under that key. This is because the app runs under the security context of the user that launched it.
If you restrict access to that key to only SYSTEM, noone else, including Admins and Domain Admins, will be able to change anything under that key. You will restrict access to the Kernel and only the Kernel! This is of course, unless you change the default restrictions on the Admin accounts.
Does that REALLY sound like a good idea to you?? And does your app's security REALLY need to be that tight?? I doubt it...
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Dave thank you for replying:
My understanding is that a regkey will have full control allow to SYSTEM and Administrator. So, if I deny to SYSTEM, I still could change permission back to allow with admin access, ie if I log on as administrator.
Currently, to test my app, I am changing permission manually [regedit --> right click on regkey, permission... so on].
Do I need it?
Because of sensitivity data’s I am incline to this solution.
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The changes are working because permissions are being inherited from the keys above the one you're modifying. Take that away, and you won't be able to recover the key, or even get at it.
If the data is that sensitive, encrypt it. Don't put Admin's through the hassle of fixing this when it breaks. Notice, I didn't say if it breaks! Supportibility is not optional.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Thanks again for feedback.
Right now got a work around [segregate keys with unrelated destination and key_names].
Encryption is not in scope yet.. But I will keep it back of my mind [i am sure it will a whole new beast, especially with fs]
FYI The solution I am dancing around
http://msdn2.microsoft.com/en-us/library/system.security.accesscontrol.registryaccessrule.aspx
also
One of the issues that I am not getting handled on is “SetAccessControl” [Microsoft.Win32.RegistryKey]
Thanks
-- modified at 14:40 Friday 5th May, 2006
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i want to inherit image class. but it's error
who can help me?????
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svincoll4 wrote: i want to inherit image class. but it's error
who can help me?????
You should post your error on the forum.
-- modified at 21:43 Thursday 4th May, 2006
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this is my code :
<br />
public class ImageData<br />
inherits System.Drawing.Image<br />
<br />
end class<br />
when i write it, a error show : "Class 'ImageData' must declare a 'Sub New' because its base class 'Image' does not have an accessible 'Sub New' that can be called with no arguments."
so, i wrote it then :
<br />
public class ImageData<br />
inherits System.Drawing.Image<br />
Sub New()<br />
end sub<br />
end class<br />
then, a error next: "First statement of this 'Sub New' must be a call to 'MyBase.New' or 'MyClass.New' because base class 'System.Drawing.Image' of 'ImageData' does not have an accessible 'Sub New' that can be called with no arguments."
then, i continue write :
<br />
public class ImageData<br />
inherits System.Drawing.Image<br />
Sub New()<br />
MyBase.New()<br />
end sub<br />
end class<br />
a error next again : "Overload resolution failed because no 'New' is accessible."
i don't understand it
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As the Image class doesn't have any New method without parameters, you have to supply one or more parameters in the call.
Look to the reference to see what parameters you can use.
---
b { font-weight: normal; }
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but Image class no contructor
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You are right. I tried to do it myself, and I failed to find a way to inherit from Image.
The documentation mentions the Image class as providing functionality for the Bitmap and Metafile classes. Perhaps it's not meant to be expanded by other classes, e.g. having an internal constructor so that only classes in the same assembly can inherit from it.
---
b { font-weight: normal; }
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Yeah, I know it's kind of weird, but, you can't do this! 8)
The problem is that the constructors for the Image class are tagged internal. This means that only classes inside the same assembly (System.Drawing.dll) can inherit from Image. Stupid, isn't it?
There is no way to directly inherit from Image. But, there is a pseduo-way around it in C#. Check out this[^] discussion. I don't know if the exact same thing can be done in VB.NET yet.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi everybody,
I have a question regarding new events in VS2003. I have read that it is not possible in 2003 but is available in 2005. I have found some code I wish to translate from C# but can't seem to figure it out. Does anyone know how to do this:
public new event DateCancelEventHandler Validating
{
add{this.validating+=value;}
remove
{
try
{
this.validating-=value;
}
catch(Exception ex)
{
throw new ArgumentException(ex.Message ,"Validating");
}
}
}
in vb.net?
thank you
eatwork
-- modified at 18:17 Thursday 4th May, 2006
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Our Instant VB C# to VB converter produces:
Public Shadows Custom Event Validating As DateCancelEventHandler
AddHandler(ByVal value As DateCancelEventHandler)
AddHandler Me.validating, value
End AddHandler
RemoveHandler(ByVal value As DateCancelEventHandler)
Try
RemoveHandler Me.validating, value
Catch ex As Exception
Throw New ArgumentException(ex.Message,"Validating")
End Try
End RemoveHandler
RaiseEvent(ByVal sender As Object, ByVal e As EventArgs)
End RaiseEvent
End Event
David Anton
www.tangiblesoftwaresolutions.com
Instant C#: VB to C# converter
Instant VB: C# to VB converter
Instant C++: C# to C++ converter and VB to C++ converter
Instant J#: VB to J# converter
Clear VB: Cleans up VB.NET code
Clear C#: Cleans up C# code
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Hello David,
Thank you for your response. I have tried the code you supplied, but it does not seem to work in VS2003. It says that an end of statement is expected on the line "Event Validating As DateCancelEventHandler" and everything else after that generates some code errors. Do you know if it is possible to create custom events in VB.net, similar to those in C#? Thanks
eatwork
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Custom events are not available in VB 2003.
David Anton
www.tangiblesoftwaresolutions.com
Instant C#: VB to C# converter
Instant VB: C# to VB converter
Instant C++: C# to C++ converter and VB to C++ converter
Instant J#: VB to J# converter
Clear VB: Cleans up VB.NET code
Clear C#: Cleans up C# code
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Hi all
Im having trouble displaying part of my structure when reading it back out of an array
basicly
i read in from a csv file
grab the user name and the total the use was charged
create a entry into a sorted list useing the usersname as the key
then for the value i have a collection and add the name , department , total)
if the user shows up again while going through the csv file i will simply add the total to the existing total
when i watch the variables in the watcher everything adds up fine
but when i display it it comes out as the first entry into the collection
Now i first thought mabey it was just doing something funky with the conversion between int and dec or soemthing like that
but then i checked in the csv file and 47.02 is the frist entry for this user
so basicly i am completely lost
Screenshot
http://i1.tinypic.com/x3ww3b.png
-- modified at 16:34 Thursday 4th May, 2006
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<br />
Imports System.IO<br />
Imports System.Text.Encoding<br />
Imports System.Text.RegularExpressions<br />
<br />
Public Class Form1<br />
<br />
Private Sub ExitToolStripMenuItem_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ExitToolStripMenuItem.Click<br />
Me.Close()<br />
End Sub<br />
<br />
Private strSourcePath As String<br />
Dim ipassinfo As New SortedList<br />
Public Structure user<br />
'Declare data members<br />
Public username As String<br />
Public department As String<br />
Public domestictotal As Decimal<br />
End Structure<br />
Dim userinfo As New user<br />
Private Sub OpenToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OpenToolStripMenuItem.Click<br />
Tb_totals.Clear()<br />
tb_usertotals.Clear()<br />
tb_linesproccessed.Clear()<br />
<br />
<br />
With Me.OpenFileDialog1<br />
.InitialDirectory = "C:\"<br />
' The file could be of any type. The Filter is restricted to Text Format <br />
' files only for demonstration purposes.<br />
.Filter = "Tab delmited (*.csv)|*.csv"<br />
.FilterIndex = 1<br />
<br />
' The OpenFileDialog control only has an Open button, not an OK button.<br />
' However, there is no DialogResult.Open enum so use DialogResult.OK.<br />
If .ShowDialog() = Windows.Forms.DialogResult.OK Then<br />
strSourcePath = .FileName<br />
<br />
<br />
Dim datipass As New StreamReader(.FileName)<br />
'*'' Dim totalChargeByName As New SortedList<br />
Dim fields As String()<br />
Dim count As Int16<br />
<br />
Do Until datipass.Peek() = -1<br />
Dim MyLine As String = datipass.ReadLine<br />
Dim myparse As String<br />
<br />
'create variable for "'"<br />
myparse = (ControlChars.Quote & "," & ControlChars.Quote)<br />
'Replace "," with tab's<br />
MyLine = MyLine.Replace(myparse, ControlChars.Tab)<br />
'remove certian words<br />
MyLine = MyLine.Replace("usatoday\", "")<br />
MyLine = MyLine.Replace("eu\", "")<br />
'forces everythign to lower<br />
MyLine = MyLine.ToLower<br />
'break feild up on tabs<br />
fields = MyLine.Split(ControlChars.Tab) 'Or Convert.ToChar(Keys.Tab)<br />
<br />
<br />
'check to see if entrie already exists if not create it<br />
If ipassinfo(fields(2)) Is Nothing Then<br />
'loading the structure<br />
userinfo.username = fields(2)<br />
userinfo.department = "???"<br />
userinfo.domestictotal = fields(9)<br />
'adding the structure to the sortedlist under key username<br />
ipassinfo.Add((fields(2)), userinfo)<br />
Else<br />
' adds charges to total if allready exists<br />
userinfo.domestictotal = userinfo.domestictotal + fields(9)<br />
End If<br />
count = count + 1<br />
Loop<br />
Me.tb_linesproccessed.Text = count<br />
'release the access of the file<br />
datipass.Close()<br />
<br />
Dim x As String<br />
Dim y As Decimal<br />
Dim total As Decimal<br />
Dim i As Integer<br />
<br />
For i = 0 To ipassinfo.Count - 1<br />
x = ipassinfo.GetKey(i)<br />
<br />
y = DirectCast(ipassinfo.GetByIndex(i), user).domestictotal <-------------- here is where i am having the trouble<br />
total = y + total<br />
<br />
tb_usertotals.AppendText(x.PadRight(20) & ControlChars.Tab & y.ToString("C") & vbNewLine)<br />
Me.tb_usersmade.Text = i<br />
Next i<br />
Me.Tb_totals.Text = total.ToString("c")<br />
<br />
End If<br />
End With<br />
End Sub<br />
-- modified at 16:36 Thursday 4th May, 2006
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Hi All,
I'm using VB6 to retrieve the database table's schema. I have another routine that returns the some of the table Fields schema information, but it dosn't label the primary key field.
Here are the routines I'm using:
Private Sub List_DB_Tables(cnnDB As ADODB.Connection)
On Error GoTo List_DB_Tables_Err
Dim itmX As ListItem
Dim lngLen As Long
lvTables.ListItems.Clear
lvFields.ListItems.Clear
Set rstSchema = cnnDB.OpenSchema(adSchemaTables)
With rstSchema
Do Until .EOF
If (UCase(!TABLE_TYPE) = "ACCESS TABLE") Or (UCase(!TABLE_TYPE) = "SYSTEM TABLE") Then
.MoveNext
Else
Set itmX = lvTables.ListItems.Add(, , !TABLE_NAME)
Call AutoSizeColumn(lvTables, 0)
itmX.SubItems(1) = !TABLE_TYPE
Call AutoSizeColumn(lvTables, 1)
.MoveNext
End If
Loop
End With
List_DB_Tables_Exit:
On Error Resume Next
rstSchema.Close
Set rstSchema = Nothing
Exit Sub
List_DB_Tables_Err:
Msg = "Error in frmMainMenu - List_DB_Tables subroutine. " & vbCr & _
"Error # " & Str(Err.Number) & " was generated by " _
& Err.Source & vbCr & Err.Description
MsgBox Msg, , "Error", Err.HelpFile, Err.HelpContext
Resume List_DB_Tables_Exit
End Sub
Private Sub List_Fields_In_Table(cnnDB As ADODB.Connection, strTable As String)
On Error GoTo List_Fields_In_Table_Err
Dim itmX As ListItem
Dim J As Integer
Dim fld As ADODB.Field
Dim prp As ADODB.Property
lvFields.ListItems.Clear
Set rstSchema = New ADODB.Recordset
strSQL = "SELECT " & strTable & ".* FROM " & strTable & ";"
rstSchema.Open strTable, cnnDB, , , adCmdTable
' Enumerate the Fields collection of the strtable
For Each fld In rstSchema.Fields
Set itmX = lvFields.ListItems.Add(, , fld.Name)
Call AutoSizeColumn(lvFields, 0)
itmX.SubItems(1) = FieldType(fld.Type)
Call AutoSizeColumn(lvFields, 1)
Next fld
'reset the dynamic array size
arryElements = lvFields.ListItems.Count
ReDim arryFields(arryElements)
'Load array with field names
For J = 1 To arryElements
arryFields(J) = lvFields.ListItems(J).Text
Next J
List_Fields_In_Table_Exit:
On Error Resume Next
rstSchema.Close
Set rstSchema = Nothing
Exit Sub
List_Fields_In_Table_Err:
Msg = "Error in frmMainMenu - List_Fields_In_Table subroutine. " & vbCr & _
"Error # " & Str(Err.Number) & " was generated by " _
& Err.Source & vbCr & Err.Description
MsgBox Msg, , "Error", Err.HelpFile, Err.HelpContext
Resume List_Fields_In_Table_Exit
End Sub
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