VS 2010 Restrict User Updating A Combo Box?
Oct 11, 2011
When the user open the form a textbox is displayed that picks up data from a table. If they click Change button a combo box is displayed that allows them to change what was originally in the textbox. The combobox is updated with whatever was in the textbox as shown below.This all works fine but the user can add something in the combo box that is not in the list which is bad.
cmbAddBook.Visible = True
cmbAddBook.Text = txtAddBook.Text
txtAddBook.Visible = False
[code]....
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Jan 7, 2012
If there are fields in a combo box as i press the drop down arrow. and if i select a field... then it should not b deleted using a backspace or anyother key..
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Jan 15, 2011
How to restrict user to do rating only once..i m using AjaxControlToolkit Rating Control i VB.NET!
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Jun 8, 2012
I have a ASP.Net Web application hosted on a server. I want to restrict same user to login on different machines over the network connection but with certain conditions to be satisfied. So I thought of adding three new columns to the User table so that we can track if same user is logged in on same or different machines.
Those columns are like :
IsLoggedIn : To check if the particular user is already logged in or not.
SessionID : To check if the same user instance is opened.
IPAddress : To check if the same user is on same or different PCs.
This should satisfy some of the below conditions, but it fails to satisfy some of them. Conditions are as follows :
Both computers are on the same LAN.
Each computer is accessing the application over the internet from different locations.
Each computer is accessing the application over the internet from the same location.
Some of the application hosted which means that IP address alone is not sufficient to distinguish different computers.
Some users just close the browser without logging out. So sessions may not be ended at this situation.
How to accomplish all these conditions to satisfy with my application ?
Mainly 4th and the 5th .
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Feb 14, 2010
I want that when the application exe file is running at that time the database associated with the application shud be closed....Means...I am using the .mdb file.
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Aug 9, 2010
How to restrict user to select not more than 10 asp.net checkboxes on button click event , if user select more than 10 checkboxes then alert box will pop up that you can not select more than 10 checkboxes
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Dec 12, 2009
Is it possible to restrict a user from opening a sub folder like "permission denied" message should display while trying to open the folder. If yes, help me to solve this using vb.net in winform as well as using vb.net in asp.net
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Mar 15, 2012
I want that when the application exe file is running at that time the database associated with the application shud be closed....Means...I am using the .mdb file...is there any way that when the application starts, if the user has opened the .mdb file then it shud be closed and also that when the application is running no one shpuld be able to open the .mdb file....
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Feb 10, 2011
i have to find a string in an array. i am using array.indexof method to get the index of matched item. now problem is that indexof method comparison is case sensitive and i cannot restrict user to provide case sensitive string.[code]
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Mar 15, 2012
If i double click on the dataset. i am not sure which statement to write to restrict the user so that he/she cannot enter the date in the past. i have droped the data set on the form and my data entry is through datagrid view.
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Apr 20, 2012
I have developed a windows services that Log On As "Local System" account with Statup Type "Automatic". I understand that windows services starts before user logins. But I want my service to start when ever user logs in.
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Feb 4, 2011
I have folder in my asp.net website i have following pages inside admin folder login.aspx, home.aspx, welcome.aspx..i want if user directly open page welcome.aspx or anyother page inside admin folder then it automatically redirect to login.aspx till they login using admin id and pass.how to do this setting in web.config...using authorization vb.net
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May 10, 2009
I have a login page, which a user will have to enter username, password and accesslevel. Accesslevel is either 1 or 2. 1 for admin and 2 for users who are restricted from using certain functions. I have this module set up so that I can make use of the accesslevel throughout the forms that I have.
Module ModuleAccessLevel
Public AccessLevel As Integer
End Module
Arjun taught me how to make use of this module, so now I know how to restrict users from using certain buttons, toolstrips by doing the following:
[Code]...
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Dec 2, 2009
I have a combo box that is bound to a dataset using the IDE. When I add a row to the table it does not reflect the change in the combo box until after I close the program down and restart it back up.To update the underlying table I open a form from the main form and ask the user for information to add.Then I call the following function to add the info.[code]My binding source for the combo box in the IDE is set to Tb lDrivers BindingSource which gets its info from the above tblDrivers table
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Aug 7, 2010
[code].....
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Apr 17, 2011
im writing a program for counting the cash in a till.i have most of it worked out through research on this site and others. im trying to code a text box that allows the user to enter any amount between 0 and 9999.99. I have everything working except restricting user from entering more than 2 digits after the decimal. I could leave it as is and the currency format that im using will automatically round the input to 2 decimal places but this creates a problem if the user accidentally enters an extra digit and the program rounds up. for example if the user intends to enter "23.34" but accidentally enters "23.345" the program will round up to "$23.35" which will cause a problem in the end calculations.here is the code. if someone could explain what i need and where that would be great.
Private Sub TextBox1_KeyDown(ByVal sender As Object, _
ByVal e As System.Windows.Forms.KeyEventArgs) _
Handles TextBox1.KeyDown
[code]....
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Jul 25, 2011
I have a oracle database. I use the OracleDataAdapter(Oracle.DataAccess.dll) for select, update, insert, delete operations. I don't set any (table) locks on my own(I only start a transaction). I have a oracle table named "test" with the entry "test1".
Now my question: Can Person A read the entry "test1" while Person B is updating/deleting the entry at the exact same time? What happens in the worst case? An old match/empty match or can it cause any kind of exception/error(e.g. "TableLocked-Exception")?
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Aug 26, 2009
I am designing a fairly small application to manage a waiting area for a clinical department. There will be a receptionist who books appointments and updates exisiting appointments to say that a patient has "Arrived". In seperate rooms will be nurses who call patients who have "Arrived" and update the appointment as "In Session" and finally as "Discharged". The appointments are viewed in a flexgrid with nurses across the top and time down the left, patient names are displayed at the relevant times and the cells are shaded a colour to represent the current appointment status ("Booked", "Arrived", "In Session" and "Discharged").
I am using SQL Server as the back-end and Visual Basic 6 (I know) as my front-end.I have been told that there will be 2 or 3 nurses plus the receptionist logged in to the system but I would like to cater for growth.My question is what is the best mechanism to use in order to reflect the status change made by one user on the screens of the other users currently logged in?
I have been thinking about using a timer to refresh the data at a set interval but I do not want to keep hitting the server excessively (although what is considered excessive? we would be talking about a call for data every 60 secs per user). Plus the server could be serving data for many other applications so this is another consideration.Alternatively I have been thinking about sending some kind of message via Winsock to the other users notifying them of data changes as they happen. I don't have a lot of experience with this and am concerned about clients not receiving messages and users seeing old data. It also seems strange to me that once the days appointments have been retrieved from the database that "in theory" a client could go the whole day without having to query the database again to pick up changes - kind of scary.Some information on the data:We would probably be looking at around 100 appointments per day We capture patient name, date of birth, date and time of appointment and appointment status.What is the standard approach / best practice for this kind of scenario?
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Jan 18, 2011
Write an application that tests the user�s knowledge of road signs. The application should display a random sign image and ask the user to select the sign name from a Combobox.
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Dec 8, 2011
I have a simple query that fills a datatable from an Access DB. There are about 1.7 million records returned, so I would expect it to take a little time. At first, the query was a very simple one, and it took a couple seconds to fill the datatable. However, I really wanted the ability to restrict the rows by a certain date field, which meant a single INNER JOIN to a different table. Having written this, I verified that it was correct by copying the SQL string into the query builder in Access. The query, in Access, took a couple seconds to complete. That was comparable to the time I was seeing before I added in the join.
However, in VB, the query isn't completing at all. After 60 seconds, I get a message about a ContextSwitchDeadlock stating that it hadn't been able to transition or pump messages in a long time. Frankly, since the exact code works fine when I remove the JOIN, this seems like it is either a deadlock internal to the Jet engine, or the error message is an artifact of a very long running query. My question is why a query (albeit a large one) is hanging in the VB program when the exact SQL runs in a couple seconds in the Access query designer, and when I remove the JOIN, the query runs in a couple seconds in VB?
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Jan 28, 2011
1) I'm dragging a file (.txt) into a rtb which works fine, but how do I get the filename? (messagebox whatever)
2) How do I restrict files to drop? (like a .exe)
vb.net
If e.Data.GetDataPresent(DataFormats.FileDrop) Then
Dim Files() As String
Files = e.Data.GetData(DataFormats.FileDrop)
Dim sReader As New StreamReader(Files(0))
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Sep 27, 2010
None of the Microsoft videos I have watched, or the other posts I have seen, have given me the pieces I need to understand this process. This is the one key piece of understanding that I need to finish about 4 different programs I have started in the last 2 years. All of them key on understanding the following processes:
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Sep 3, 2010
I open a word document in webbrower, but some File Download dialog box opens up with three buttons Open, Save and Cancel. I always wants to open the document directly instead to click on open button.
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Aug 18, 2010
I am in a need of a Regular Expression to restrict input to only certain characters in a text box. The text box can only allow 0 or 1 "+" sign at the beginning and at no other position. The text box can only allow 0 or 1 ":" sign not before the "+" sign. The text box can allow any number of 0-9 digits.
[Code]...
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Nov 4, 2009
I have followed a tutorial at url.... It is a very good tutorial but it is also a little dated. Most people who visit it praise it to high heaven so I decided it was a good place to start as an absolute beginner to programming. (I have teamed it up with Dan Mabbut Vis basic tutorial at about.com and joined DreamInCode in order to learn what I can accomplish with Visual Basic 2008 Express ). I am up to part 6 of 7 but keep going back to part 4 because there is one aspect I just cant work out.I am creating a form which logs staff in or out of work and allows staff to include a message with their ( at work /away from work ) status details on the form.The form is supposed to update a users status in a new row when they click a button. In my form the rows per user are being over-written with the updated information - it is not being written in a new row. There is a login form which precedes the staff status form - this has a little relevant code re calling the user info from the database but I think my problem is related to the insert statement in the middle of the below code.[code]
My code has changed quite a bit since the above as the form has progressed but the problem started at the stage above and has not changed with the forms progression. Every other aspect of staff update info is working well in my form - just not in a new row.I am going bald - The tutorial was written for VB2005 Express - I am using VB2008 Express though it has not made too much difference to the tutorial.
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Aug 28, 2009
i am using vb.net 2005 to developed desktop application ,I am having two windows form user control , the first control name con.vb containing the design and code for connecting to database and getting a list of my project values in combo box.Now the second user control report.vb which i am using to generate some reports , since the code behind is using connection to connect to various project database , so i want to get the value of First user control into another how i can get the i have tried the below but its giving me error in run time but no error in design or code behind [code]
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Jul 10, 2009
I am writing an app that uses a combo box to list file types for a user to select from. Because a complete list of all options is both impossible and wildly unwieldy, I am only providing about 10 common extensions. I want the user to be able to type in their own file extension if the one they need is not listed. the first item in the combo box is empty by default, but during testing when i type something in their to use as my selection, i get the exception "Object reference not set to an instance of an object." pointed at extensionComboBox.SelectedItem.ToString
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Jun 21, 2011
I have a problem when updating an entity (User) in my application.
The entity is located in session when the user has been logged. So I made it:
Dim u as User = (From x in ctx.Users).First()
Session("user") = u
[code]...
I got the follow error:
An object with a key that matches the key of the supplied object could not be found in the ObjectState Manager.Verify that the key values of the supplied object match the key values of the object to which changes must be applied.
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Aug 31, 2009
i am using vb.net 2005 to developed desktop application I am having two windows form user control , the first control name con.vb containing the design and code for connecting to database and getting a list of my project values in combo box.
Now the second user control report.vb which i am using to generate some reports , since the code behind is using connection to connect to various project database , so i want to get the value of
First user control into another how i can get the i have tried the below but its giving me error in run time but no error in design or code behind -
MR.MainForm.Connection1.project_combobox.SelectedV alue.ToString
Error i am getting is :
System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="MDR"
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Jan 20, 2009
Is it possible to deactivate a combo box once a user has selected an option?
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