Limiting Access To A DLL In .NET
Feb 12, 2010
I write in-house software for a company. I always want to leverage OOP techniques as best as I can. In this thinking, I want to create a Data Access Layer (DAL) isolated in its own .DLL. What can I do to limit the access of the DAL DLL to only my business logic layer DLL? The last thing I need is someone in the company with a little programming knowledge plus access to the system (via Active Directory) to install .NET Express, reference my .DLL, and start firing off data access code outside of the real system. Are there any .NET mechanisms I can employ to limit a DLL to be used only by a pre-selected host application/DLL?
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Jan 30, 2011
My application allows the user to enter text into a RTB including all the various text font, size, etc changes. The user then prints that data onto a label. I got from my previous posts, I can print that on my label Each sheet has four labels, 3x5 inches. I print landscape and adjust margins to select the right label.But I want to limit the amount of text the usr can enter to the amount that will fit on the label. In essence, what I would like the user to see is a virtual label on the screen that they can type data into and get exactly the same formatting on the label when they print it.
I found several (mostly old) articles about linking the RTB to the printer, but nothing on how to set and limit the size of the RTB to the exact size of the label.
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Apr 19, 2009
I have made a game (real time strategy) and it is running rather fast on my 3 GHz quad 8800 GTX, namely, it runs around 200 FPS usually when there are like 80 units and tanks in a forest fighting.
I would like to limit the FPS. So far my limitation code is pretty buggy... it does limit, but wrongly:
Private Sub LoopGame()
Do While GameIsNotPaused
FPS += 1
[Code]....
Also, after I solve this weird issue, should I set the value to monitor's refresh value which is usually 60 Hz on LCDs? Or should I set it to 30 or what ?
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Feb 20, 2012
I've made a lot of progress on my project. Only question I have now is how do I limit a textbox to only allow users to input numbers and one decimal point? The point of the decimal point is to make it currency. So if the answer of my calculation is 56.56566 I only want it to be $56.57.
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Nov 21, 2010
sample of codes that i use to insert the data in my table, it works just fine but the problem is that i cant limit my user for example from entering null values, or integers into string or strings into integer,,,,, I also ask for assistance on how to handle any errors in my system from crashing.
Dim conn As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Application.StartupPath & "MOMSTEST.mdb;")
Dim Comm As New OleDb.OleDbCommand
[code]....
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Oct 10, 2011
I've got rows in my table that contain text anywhere between 31 character and 281 characters long.Rather than display all this text in my table on my webpage, I'd like to limit this text to a few characters long so as to identify it to the user.What I've done is select left(ColumnName, 30) but this way is fairly ugly on the page as it cuts off the text in the middle of words.
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Dec 14, 2011
i got a program that has clients send self typed messages via gmail and i want to be able to limit everyones use of this so they dont try to spam me, i want to make it so they can only send 1 from their computer every 12 hours how would i do this?
also i would like to make sure that one of the boxes they fill in has indeed been filled in with at least 20 characters before they can click the send button, hoping this would prevent ppl from sending blank messages
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Jun 11, 2009
I have an number of text boxes and comboboxes on different forms. I have textchanged events which trigger a msgbox if the user enters invalid data(i.e. the number they enter is to big or to small). Is their a simple way to make the program not call the textchanged event when the form is loaded and the boxes get their initial value? Second is their a way to make the textchanged only be triggered when the user enters data not when the program clears the boxes?
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May 29, 2009
Is it possible to have a UD Class that can limit how big it can grow as an array?
for example:dim var(10) as class this would throw an exception cause the class will only grow up to 5 elements.dim var(4) as class valid cause it is under the 5 element rule dim var(4, 10) as class invalid cause the 2nd dimension is above the 5 element rule. (would throw exception)
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Mar 30, 2012
I want to limit the number of students (60) that will be enrolled in one section and prompt a message that it surpass the limit. I inserted it in my combobox1
Here's my code :
strsql = "select * from Schedulings where Sections = '" & ComboBox1.Text & "'"
Dim acscmd As New OleDb.OleDbCommand
acscmd.CommandText = strsql
acscmd.Connection = asconn
acsdr = acscmd.ExecuteReader()
It doesn't work. How should I do it?
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May 19, 2011
Does anyone know how to add a limit to the number of items in a list box? For example, you can't add more than 10 items in ListBox1.
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Apr 30, 2011
This program allows a user to select a workshop and a destination, only one selection should be made. When I test I find I can add multiple of the same.
Private Sub ListBox1_Validated(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.Validated
If ListBox1.SelectedIndex = -1 Then
Beep()
MessageBox.Show("Select a workshop please.")
End If
[Code] .....
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Dec 15, 2009
I have a class called Item which contains all the information about all parts, finished goods, in process parts (parts made on site), purchased parts, and raw materials.
I have a Bill of Materials table which has the following columns (reflected in the BOM class)
ParentItem
ChildItem
ChildItemQty
Parent Items can only be Items which have subcomponents.
Child Items can be parts that are made on site, purchased parts that are bought ready made from other companies, or raw materials used to make a part that is made on site.
Parent Items and child Items both inherit the Items class.
I will limit the Parent item class to only items that are in the parent column of the BOM table. I believe I can limit that by doing a quick look up on a view which only shows the parent items.
I will limit the Child Item Class to only items that are in the child column of the BOM table. Same method to limit it by doing a quick look up on a view that shows only the child items.
That way, an instance of the BOM class will have all the detail information about any of it's components available whenever I need them.
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Sep 6, 2009
I had a DataGridView in which i want to fetch the data from the access database,so i did this
Dim connString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Etech.mdb"
Dim myConnection As OleDbConnection = New OleDbConnection
myConnection.ConnectionString = connString
[Code]...
In the above snapshot,after fetching the data from the access database to the DataGridView,i want to remove the PplicyHolderName,PremiumAmount and a few other columns since these are the columns which do not contain any data....
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Apr 25, 2012
I have a textbox called textbox1. I wanted to limit it to only two characters, so I added the code TextBox1.MaxLength() = 2, however this textbox is for user input and only want to allow numeral values 0-99. And if the user entered a non-numerical value an exception would occur so I need help on to handle that.
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Nov 29, 2011
Currently I have calculated that one of my functions executes 62 times per second (on average). How can I limit this to say exactly 50 times a second (every time)?
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May 12, 2012
I have a textbox called textbox1. I wanted to limit it to only two characters, so I added the code TextBox1.MaxLength() = 2, however this textbox is for user input and only want to allow numeral values 0-99. And if the user entered a non-numerical value an exception would occur
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Dec 29, 2009
So I am trying to make a program where the user is limited in moving the mouse to a form. I still want the user to see whats going on behind the form but not be able to click on anything but my form.
I tried using this
Cursor.Clip = Me.RectangleToScreen(Me.ClientRectangle)
The problem is that if the user clicks in certain spots on the titlebar...the mouse is unlocked. The machines this is going on has a ball type of mouse so if you scroll fast and click fast enough...it can also unlock.
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Oct 15, 2011
how can i limit a user to enter 10 digit no like telephone no in textbox without using regular expressions?
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Oct 9, 2011
how can i limit a user to enter just 10 digit number (minimum 8 but not more than that 10 in any case) in a textbox(like telephone no)?
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Jan 26, 2012
I am trying to restrict the the number of decimal places to two in a textbox.
I've already made it so only numbers and decimals can be added, now this is the only thing that isnt done
Private Sub MoneyTxtxbx(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles _
MoneyTxtbx.KeyPress
[Code]....
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Sep 18, 2009
My combobox dropdownlist contains 60 to 65 items. So i want to show 5 items in the dropdownlist of my combobox and add a vertical scroll bar in it so that the user can scroll it and see the items. How to add a vertical scroll bar in the combobox dropdown list? I want to add this vertical scroll bar only when the dropdown list contains more than 5 items.
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Jun 2, 2012
I am creating an application in Visual Basic '08 with four available checkboxes. Is it possible to limit the number of checkboxes you may select down to 2, and how may I go about doing this?
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Mar 17, 2009
How do i limit the amount of characters in a masked textbox? I can do it in a normal textbox but not in a masked textbox because there is no option to limit the size.
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Jul 6, 2011
I am using an external DLL (pdfsharp) to open (then manipulate) lots of PDF files. I use: Dim inputDocument = Pdf.IO.PdfReader.Open(PDFPath, IO.PdfDocumentOpenMode.ReadOnly) Problem is - it seems to hang on certain, rare files. I don't seem to get any timeout - it just hangs for hours on this line. We read thousands of files with this code, always on tiny files, so I was thinking that a quick workaround might be to somehow timeout if the this method takes more than a second or two. But I don't see a simple way to do this. I am hoping to avoid spinning up a worker thread.
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Oct 26, 2011
I have a mvc 3 vb.net razor App that I need to redirect the view to a different action if the link is not clicked on between a preset range of Month/Day/Year ranges.This is needed to limit registration for a school semester to only be able to be performed between and Open Registration Date and a End Registration Date.I am thinking I can simply put this in the controller function in the form of either a If Statement or a select case and then use redirect based on the condition of the date..Is there some simple short code to use to perform this test.My variables for the dates are OpenDate and EndDate.[code]
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Apr 9, 2010
I need to retrieve multiple objects from an external system. The external system supports multiple simultaneous requests (i.e. threads), but it is possible to flood the external system - therefore I want to be able to retrieve multiple objects asynchronously, but I want to be able to throttle the number of simultaneous async requests. i.e. I need to retrieve 100 items, but don't want to be retrieving more than 25 of them at once. When each request of the 25 completes, I want to trigger another retrieval, and once they are all complete I want to return all of the results in the order they were requested (i.e. there is no point returning the results until the entire call is returned). Are there any recommended patterns for this sort of thing?
[Code]...
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Sep 16, 2009
Dim query = (From p in Parent _
select _
p.ID, _
Tags = String.Join("|", p.Child.Select(Function(c) c.Tag.TagName).ToArray)).Take(100)
In the above query, when using Take to limit the rows returned, a separate SQL query is executed for each row to return the 'Tags' field. If I remove Take(100), a single query to sent to Sql Server.So, how do I limit the number of rows returned, while preventing a new sub query being executed for each row?
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Jan 28, 2012
Assuming that I have a Windows Forms textbox and want to reduce the maximum amount of characters that can be allowed in via user entry, how would I do that?
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Oct 15, 2011
I have an application that has an Ms Access 2007 DataBase which runns great if access is installed. Is there any code that I can use in vb that I would be able to run access with out installing it.
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