Prevent Duplicate Values Entered By User?

Feb 10, 2012

How do I prevent users from a inserting a duplicate value using SQL Query

datatype is VarChar(50)

e.g. the name field has already been defined as "Josh", I don't want it to be able to add another "Josh"

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Asp.net - Prevent FormView From Clearing User's Entered Values After Insert Method Has Fired?

Feb 26, 2010

I have been struggling with getting FormViews to work the way Microsoft expects me to for about a day and have figure a bunch of great stuff out.

I can catch e.Exception and e.ReturnValue in the ObjectDataSource.Inserting Event Handler and I can even cheat and check other properties of the Object in the ObjectDataSource.ObjectDisposing by checking the e.ObjectInstance ... and I even learned that FormView's Inserting Handler Runs AFTER the ObjectDisposing Handler so If there is a problem found I still have time to react to it and st the e.KeepInInsertMode to true on the FormView.

My problem is, it seems that the values entered by the user into the Insert form are cleared regardless.

So, How do I Prevent a FormView from clearing after it's Insert Method has fired?

(Using ASP.NET + VB)

I don't think posting my code here will really do much good and i would have to modify it to trim out confidential business logic stuff... so I'll skip it for now.

edit:

I have found a temporary and admittedly terribly cludgy solution (in case no one ever finds a REAL solution to the problem).

I have a page variable defined as:

Dim eInsertArgs As FormViewInsertedEventArgs

And then I do the following in my ItemInserted handler

If boolInsertErrorOccurred = False Then
e.KeepInInsertMode = True
eInsertArgs = e

[Code].....

The effect of this is that I am setting the values BACK to the submitted values AFTER ASP.NET binds the FormView to the default (blank) Template.

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Read The Values Entered By The End User?

Dec 17, 2010

I have an EXE that creates objects based on params passed to it.Say I have textboxes named 57 and 21.I want to read the values entered by the end user.

Var1=57.text
Var2=21.text

How do I pull this data from the boxes?

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Saving User Entered Values And Results In Database

May 23, 2011

I have created a small program that performs various calculations with data entered by the user. I need to be able to save the entered values and the results on the system running the program and be able to open it at anytime in the future and have the values and results displayed in the correct text boxes. I am currently reading up on some tutorials but I was just curious as to how I can send all my data in Visual Basic to my database in Microsoft Access?

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VS 2008 Saving And Loading Values That Are Entered By The User

Nov 13, 2009

The problem is this: I have two forms. One form and the other form do mathematical calculations. I want to save the values that the user inputs, so when the user quits the program and then starts it up again the values are still there. But when I open up the program, start typing in values, then calculate them, hit quit. Try to open up the program again, its giving me a message that the input file is invalid. When I click ok, the program doesn't crash, continues. But the values are not there at all. The other form I put exactly the same code, just changed the variables and it doesn't want to save the values at all! I wrote this code for saving and loading the values:

[Code]...

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C# - Library Or Code Snippet For AutoComplete In Text Control Based On The Previous User Entered Values?

Sep 19, 2010

I'm looking for a library for Autocomplete support in text controls which remembers all previous entries of the user and provide auto-complete support for it.For example for "recent files" I use [URL] and it works great. Do you know something like that for this purpose?

UPDATE : This is a .NET Winforms application and I'm using normal Text Control.

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Prevent Duplicate Entries In SQL?

Feb 10, 2012

How do I prevent a duplicate entry from a text field by using SQL Query?

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Prevent Duplicate Upon Keypress

Sep 3, 2010

I have a form with 4 textboxes. How would I prevent the user from entering a duplicate value upon keypress?

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Prevent Numbers Being Entered In A Textbox?

Mar 11, 2012

I have a textbox where the user enters their name, however it is possible to enter numbers in textbox, i was wondering if there is a pre existing function that only allows alphabetical characters to be entered?

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C# - Prevent A Duplicate Insert After Refresh?

Nov 3, 2009

Is there an easier way to prevent a duplicate insert after refresh? The way I do it now is to select everything with the all fields except ID as parameters; if a record exists i don't insert. Is there a way to possible detect refresh?

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Prevent Duplicate Record Entry?

Aug 2, 2010

How Can i prevent duplicate record entry in vb.net.

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Forms :: Prevent Duplicate RECORDS Datagridview?

Feb 7, 2009

how to prevent duplicate RECORDS in datagridview cell vb.net

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Prevent AutoPostback From Clearing Entered Data From Forms

Jul 6, 2011

Background: I have an web form that autpostbacks a list of bundles to a listbox based on the carriers selected. When Postback happens, all user entered data is cleared. How do I prevent the AutoPostback function from clearing entered data from the forms? [code]

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Disabling Button Before Executing VB Code To Prevent Duplicate Records?

Feb 15, 2012

I need to disable a button after its pressed so the user does not have the ability to click it again as this would replicate the process in some cases.After alot of searching I found some tips - alot of code I found I could not understand.This is what I have come up with:

On page load:
If Me.Page.IsPostBack Then
'lblDetails.Text = "disabled"

[code]....

I also read somewhere that I should use: System.Threading.Thread.Sleep(1000) to delay the process or something - not entirely sure why I would do this though.Although, the problem with my above code is that when the code behind page performs validation checks, it exits sub before executing my INSERT SQL code - so when it does this it also disables the button.I am not entirely sure if the above method is fool proof or whether it is a **** piece of code that won't work 100% of the time.On another website I found a script to put on the actual HTML page with <script> tags:

Code:
<script type="text/javascript">
disableSubmit(frm) {

[code].....

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Interface And Graphics :: Disabling Button Before Executing VB Code To Prevent Duplicate Records?

Aug 5, 2008

I need to disable a button after its pressed so the user does not have the ability to click it again as this would replicate the process in some cases. After alot of searching I found some tips - alot of code I found I could not understand.This is what I have come up with:

[code]...

I also read somewhere that I should use: System.Threading.Thread.Sleep(1000) to delay the process or something - not entirely sure why I would do this though.Although, the problem with my above code is that when the code behind page performs validation checks, it exits sub before executing my INSERT SQL code - so when it does this it also disables the button.I am not entirely sure if the above method is fool proof or whether it is a **** piece of code that won't work 100% of the time.On another website I found a script to put on the actual HTML page with <script> tags:

[code]...

But although this works, it does not execute my VB code in the code behind page so I am a little confused where to go here.

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VS 2010 Can Use Timer When User Tries To Log-in And User Entered A Wrong Password 3 Times

Jan 6, 2012

Can i use the timer when the user tries to log-in and the user entered a wrong password 3 times.i will give the user 5 mins to log-in again with the correct password and if the user enters the wrong pass. 3 times again i will give another 10mins also this is what i want when the user close the program the timer is also their and running that it will give the user the remaining tym on how much tym left 4 him to log-in again.Can i do this in vb.net??i dont know how 2 do this i dont have a clue if it is possible can someone give me a code??

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Duplicate Values In A Datagrid?

Feb 26, 2012

I'm using an unbound data grid in Visual Basic. I made the following loop for the purpose of searching each cell and each column for a duplicate value. But for some reason I get a "InvalidCastException" when I try to add a second row.

Private Sub AddJudgeBtn_Click(sender As System.Object, e As System.EventArgs) Handles AddJudgeBtn.Click
Dim exists As Boolean
' ToDo: If the value entered is already on the list, don't add again.
If JudgeList.Rows.Count() > 0 Then

[code]...

EDIT: Adding the entire click event.

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Get Duplicate Values From Dgv Into A Combo?

Dec 14, 2011

I am trying to get duplicate values from dgv into a combo:

[Code]...

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How To Set Up Array Within Program To Allow 10 Values To Be Entered

Jun 16, 2010

I just need to know how to set up this array within the program to allow 10 values to be entered then later be shown into separate labels as a largest and smallest value.Create an application that lets the user enter 10 values into an array. The application should display the largest and smallest values stored in the array. Figure 8-45 shows an example of the application's form after all 10 values have been entered, with the largest and smallest values displayed.The form basically shows a large label box where your values will show up. Then two regular labels next to the boxed label that determines the largest and smallest values. There are four buttons, a clear, exit, Display Min & Max, and Input Values.I have the actual program layout already made and the initial buttons already declared, being the exit and clear buttons. I just need to know how to setup the array's for the other two buttons.

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.net - Linq OrderBy On Duplicate Values?

Oct 20, 2011

m_ListOfsAllFields.OrderBy(Function(x) x.DisplayOrder)

here I have DisplayOrder = 0 for 2 fields, so orderby is messing up and not ordering properly. How can I use orderby to order this collection?

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Avoid The Duplicate Values In The DataBase?

Jan 29, 2011

How can i avoid the duplicate values in the Access Database?? I am working in VB.NET, to create DataEntry Form. I have Combobox. When enter the value on Combobox and press OK button then the value should check on the database , if the value is not there then it should save on the db. else the Missage will give "It is Saved".

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Avoiding Duplicate Values In Database?

Jun 21, 2010

I want to insert number for City_Id and City_name , i wrote a query for auto generate number for City_Id,working fine but in the city name i want to avoid inserting duplicate value like if Mumbai is a City ihave already saved then system should not allow that name again. neither in small or in capital or mixed letter.

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Checking For Duplicate Values In Strings?

Aug 5, 2009

am new to VB.NET and i was wondering if anyone here knows how to check for duplicate values in strings?

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DataGrid Validation For Duplicate Values

Dec 15, 2011

I need to validate a particular coloumn in datagrid for duplicate values before inserting into database. I am using datatable.

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Random Numbers With Duplicate Values

Mar 9, 2010

Get Random value with no duplicate

[Code]...

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[2005] Drop Down Duplicate Values?

Jan 20, 2009

I have a fairly large Drop down menu:

<asp:DropDownList ID="DropDownList8" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList8_SelectedIndexChanged">
<asp:ListItem Value="" Selected="True"></asp:ListItem>

[code]......

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Calculating An Average From Values Entered Into One Textbox

Feb 25, 2012

I am making this for a homework assignment and i need to calculate the average for values entered in textbox1 and place them in other textboxes. I dont understand how to do this with numbers all placed in the same spot. here is my code thus far:

Private Sub Label1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click
End Sub

[Code].....

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Avoid Duplicate Values In Datagride View?

Nov 7, 2010

How can I avoid Duplicate values in Datagrideview. When I am putting Product Id in Invoice which is adding in datagrideview if it is exist in datagrideview it will Highlight with deferent color and give me massage that this Id is existent in datagrideview

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Checking For Duplicate Values Before Attempting Insert?

Apr 14, 2011

I have a form where two fields on the first page of the form make up the primary key. I want to check for duplicate values before attempting to insert the record, since I don't want the user to go all the way through the form only to find out they can't submit it. So I'm trying to check for duplicate values when the user tries to go to the next page of the form. I wasn't quite sure how to do it, and sure enough I'm getting an error. ("Object reference not set to an instance of an object.") The problem is apparently in my if statement, "If myValue.Length > 0 Then", but I'm not sure what needs to be in place of that.

Protected Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate
'get values

[code].....

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Delete Excel Columns And Duplicate Values

Jul 5, 2011

I am trying to create a .Net application to edit a excel file by deleting some columns and keeping the columns which we need and then removing the duplicate values based on the first column which is going to be the Serial no. which should have a check to have 6 digits by default like 2563 should be displayed as 002563.

Code:
Public Function GetAllFileContents(ByVal path As String, ByRef errorMessage As String) As IList(Of String)
Dim contents = New List(Of String)
Try
Dim files = Directory.GetFiles(path, "*.xls")
If (files.Length = 0) Then errorMessage = "Please select the files"
For Each file In files
[Code] .....

I am trying to create something different by not only letting me do it for excel files but for say txt and csv files along with it. Removing all the values which I dont want and removing the duplicates and then if possible putting a check on the first column of data that the serial number number should have minimum of 6 characters and then The output file should have all the details in Uppercase

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