Prevent Duplicates In Datagridview?

Jan 16, 2011

i have a datagrid which i add values with this code

Me.dgAppraisal.Rows.Add(Me.cmbAssementArea.Text, Me.NumericUpDownArea.Text, Me.txtremark.Text, Me.txtcoment.Text)

What i want to do is to prevent duplicate entries of values in a column.I am using this code but it is not working.

If Me.dgAppraisal.Rows.Count > 0 AndAlso Me.dgAppraisal.Rows.Contains(Me.cmbAssementArea.Text) Then
ErrorProvider.SetError(Me.dgAppraisal, "Employee has already been assessed on



VS 2005 : Prevent Duplicates In List?

Feb 27, 2011

I am trying to prevent an item from being added to my list this is what i have so far duplicates are being added

With dtAll
Dim List As New List(Of String)
Dim dtrow As DataRow


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VS 2008 : Get Values From Datagridview But Not Duplicates?

Jul 21, 2010

I need to get all the different values from my dgv, but no duplicates, and add them as rows to my dataset.for example if my dgv col1 have the following values:



the procedure must get the values from dgv1 and add it to a dataset if the values isnt already there.My dataset should have this:


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VS 2008 Killing DataGridView Duplicates?

Jul 24, 2009

I am trying to kill the duplicate fields in a DataGridView. I have it alphabetize all the items in the DGV and then compare each item down the DGV as long as it is either equal to or alphabetically lower than the next item in the DGV.Here is the code I'm using:

Do While X < data.Rows.Count - 1
' Compare 2 items next to eachother
compareResult = String.Compare(data.Item(0, X).Value, data.Item(0, Y).Value, True)
' Update the status


As I run it through more largely populated DGVs (200k items), I run into an InvalidOperationException saying that rowIndex=190000 (just some high number) is an invalid value for rowIndex.The error seems to appear more or less randomly.When tested on DGVs with 20k items, it seems to complete fine (though it may just be luck and the error isn't popping up).

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[2008] Datagridview Drag Drop : No Duplicates?

Jan 18, 2009

I am trying to drag & drop rows from datagridview1 to datagridview2 using the code below.My question is : how do I check for duplicates in the target datagridview before completing the If Jerry has already been drag dropped to datagridview2 then say, "Jerry is already in the list. Are you sure you want to add a duplicate ?"

Public Class frmDataGrid
' Some Properties that I have set for the Grid
' SelectionMode = FullRowSelect [For both the Grids]
' AllowDrop = True [For Grid DataGridView2]


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How To Prevent 'self' Drag And Drop In A Datagridview

Mar 5, 2009

I'm implementing drag and drop functionality between two datagridviews. This works as intended with one exception: it is possible to drag and drop within the same datagridview. This results in duplicated rows. I want to limit the functionality so that I can only drag from one datagridview to another.[code]

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Prevent A Datagridview Cell From Getting Focus?

Jan 3, 2010

vs 2005 sql 2005 developer/I have a datagridview with 4 columns .I want the user to be able to use the arrow keys to move through the rows and just two of the columns.I want the other two rows to behave like a label that cannot get the focus. Nor be selected.I have been messing arround with the "cell enter" event but the language wont let me set the selected cell from within that routine.

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Prevent A Datagridview From Loosing Focus?

Jan 11, 2010

I have a datagridview. If the user adds a new row, and then clicks away from the grid. How can i stop them from doing this?

I want them to finish the row add first or cancel it. I want to then update the table adapter in the grid's leave event.

If the row validation fails, i want to display a message and re-focus to the cell in question.

The first problem i am running into is that the focus continues to go to the control that the user clicked on to move away from the grid.

How do i cancel that event?

As an example, if the grid is on a tab page and the user clicks on another tab page, i want to prevent that page from displaying if there is an error on the row that is being added to the grid.

I was hopeing for a cancel option in the lost focus event of the grid.

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Prevent Users From Deleting A Particular Row In Datagridview?

Apr 26, 2009

I tried the following code but it did not work.

Private Sub PasswordDataGridView_UserDeletingRow(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewRowCancelEventArgs) Handles PasswordDataGridView.UserDeletingRow


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VS 2010 Prevent Datagridview From Refreshing?

Mar 5, 2011

the Datagridview is included in first tabpage. first tabpage is the search form and the second tabpage is the record detail view. user is switching and working between those two continuously.

The problem is that everytime user selects the tabpage1 the datagridview repaints itself. there is about 6000 rows in datagridview so it takes about 2-3 sec to paint itself. I know the delay is normal and can't avoid that. but it affects the tabpage selection. tabpage1 isn't selected completely until the Datagridview1 finishes it job. in this time the tabpage1 and tabpage2 gets combined and confused.

is there a way to put datagridview processing in backgroundworker or something that doesn't affect main UI ?

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Disable 2 Datagridview Columns And Prevent Tab From Entering Them?

Jul 31, 2010

I have a datagrid with 5 columns.2 of these columns will have data entered into them automatically - depending on the entries of 2 textboxes.I can disable these 2 columns ok.How can I have it so that the tab key doea not enter the cells of these 2 disabled columns. ideally I'd like the tab to enter the cells of the abled columns only.

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Forms :: Prevent Duplicate RECORDS Datagridview?

Feb 7, 2009

how to prevent duplicate RECORDS in datagridview cell

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Prevent Moving From A Cell In Datagridview That Has No Data?

Aug 3, 2011

I am updating my last post so hopefully someone will help.  I have following code that will move a cell to the next column when hitting the enter key while doing an edit. It will even check the row at the last cell to validate data is present.

However, if there is no data in a cell and I press enter, the focus moves to the next line like it normally does. I need to prevent the user from moving or clicking on any cell until the cell they are on has data in it.  Here is the coe I have used[code]...

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Dec 13, 2011

How can I add my duplicates to a combobox[code]....

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Apr 15, 2010

I have a database running on SQL server primary key is all set, my question is i dont want to allow duplicates in the primary key, i want everything to be uniqure. The database already has information in it, is there a away to set it so when i add a new row through the table adapter that it will recognise the last primary key value and increment it by +1?

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Duplicates Primary Key

Jun 6, 2011

i has create system registration that use 2008 & accessdatabase (oledb connection).i set ID

as primary key,when i insert new ID but if ID already in database i will get error cz data anyone know any code that will promp mesej like this "Data already in data base,

insert ID corectly" if data already in accessdatabase.

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How To Ensure No Duplicates

Feb 20, 2010

I have a problem with ensuring no duplicates. I have an Appointments form (frmAppointments) and within it exits 4 date time pickers. The first 2 date time pickers are dedicated to creating an appointment date whilst the other 2 are for the purpose of changing an existing appointment date. When the date and time is entered into either one of the pairs (of date time pickers), the values inside get transferred to 2 corresponding textboxes. The user then clicks Save (btnSave) and the values are saved to sql.

How can I ensure no duplicates (of the date and time) can be created?

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No Appointment Duplicates?

Apr 18, 2010

I have a problem with ensuring no duplicates. I have an Appointments form (frmAppointments) and within it exits 4 date time pickers. The first 2 date time pickers are dedicated to creating an appointment date whilst the other 2 are for the purpose of changing an existing appointment date. When the date and time is entered into either one of the pairs (of date time pickers), the values inside get transferred to 2 corresponding textboxes. The user then clicks Save (btnSave) and the values are saved to sql.

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Remove Duplicates From Dgv?

Jun 20, 2012

i use csv file to populate my dgv. now i wanna eliminate duplicates from my dgv. i knew it could be done using unique datatable. but i wanna eliminate it from dgv not from the dataset or understand it in better way- i wanna check column1 if the vales in column 1 are repeated then the entire row must be deleted i.e the duplicate row must be deleted( if column 1 has 2 duplicate values then 1 row must be deleted)

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W/ Duplicates In Xml File?

May 5, 2011

I'm reading and writing to an xml file and am looking for a way to identify and delete certain nodes.  Below is an example depicting the data as rows with each row sequenced in "Sortorder".  As you may note, "Sortorder=1" data is there row containing data... the other not.   I'd like to keep the row containing data and delete the one that has blank data elements.


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Way To Delete Duplicates

Feb 6, 2009

I have 2 files one is located at ("C:DNSREDIRlocked.txt") the other is ("C:DNSREDIRcustomb.txt"). What i'm trying to do is that i need to add the text found in customb.txt file to the last line in blocked.txt and remove any duplicates found in blocked.txt. [code]...

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.net - Get Duplicates For Two Columns With LINQ

Sep 23, 2011

LINQ drives me crazy. Why does following query not return the duplicates, whereas it works with only one identifier? Where is my error?


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May 6, 2011

I need to go through a list of strings and count the number of duplicates and then print the string with the number of occurrences in one line to a file. Here is what I have but I need to only print the string once and its count.


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Jan 19, 2009

Im adding listviewitems and want to avoid duplication. Now currently, I have resorted to looping through the listview and comparing each items text property against what Im adding. But for a big table this is very slow. The ListView has a .Contains Method but this does not seem to do what I would have assumed; for example [code]Is there a way of doing this so I dont have to loop through all the items?

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C# - Find Duplicates In ArrayList?

Jul 27, 2010

I have to check duplicate records in ArrayList. In ArrayList each item should have atleast 2 times before insert new Item. Per example

Example 1:

AL(0) = '1'
AL(1) = '1'
AL(2) = '2'


Method has to return = 'false', because '2' has 1 time in the list. So I dont
want insert '3' in ArrayList and return false.

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Oct 15, 2011

I want to track orders for my small furniture factory. I want to create a tracking number based on the OrderNumber+ProductID+SeriesNumber.It should look like this:


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Sep 4, 2009

I have a web site where users enter company names to use in the rest of the app. However, recently I've noticed that similar duplicates are appearing, e.g. someone will enter EastTec Solicitors another will enter EastTec Solicitors Ltd someone else will enter EastTec Solictors (missed the i out in Solicitors), when there should only be one entry of EastTec Solicitors. What is the best way of checking the database for entries similar to what they have entered? How would you about checking for spelling mistakes as well like the Solicitors one?

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Checks For Duplicates Before Insertion?

Jan 16, 2012

Im confused on how to write a code on checking duplicates before insertion on I know the sequence on how to do it but its kinda confusing when writing a code. 

1.) Create a query that will check if the mobile number already exists on the database

2.) If not, insert the new data

3.) Else, a message will prompt that "You are already registered".

writing this in PHP is kinda easy for me but in , unfortunately, not easy.. Im still a beginner on


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Find Duplicates In A Array?

Mar 23, 2012

I have a huge unsorted array of strings like

vector = {"2421024141", "325216182","2463112099","2416997168","11114721047","4116940195","1191138134","231244164123 ",..........}


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Find Duplicates In Two Arraylists?

Oct 28, 2011

I have searched high and low for a solution yet still no luck, I have two arraylists populate with FileInfo and I want to compare the two and write the duplicate (matching files) to a listbox.Here is how I have populated the arraylists but in terms of the comparison I have not found anything that works:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim arraylist1 As ArrayList
Dim arraylist2 As ArrayList


What can I do next to compare the two and write the duplicates to ListBox1.

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Feb 25, 2010

I have a set of labels (16 to be exact) that I need to avoiding duplicates with. The 3 dropdowns get conceited to create the string at the end in the label. Two options I have are to wait until they click the "Generate Names" button to find all the duplicates, or to find the duplicate as soon as the 3rd dropdown box index changes (preferable).

All the labels have a similar name: cAname (where A = a number 1 through 16)
c1name, c2name, c3name etc.
I just need to loop through them, edit the border property of the labels that are the same.

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Oct 15, 2011

i have a list of record that already populated but my problems is How to find out if there are any duplicates? VB.NET

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Mar 25, 2012

I am trying to find duplicates in a string. The code works more than I would. The purpose is to create a jagged array with values and positions like this one:

myString = "1123464263948465475965069068547363532627281901"
jagged= {{{1},{0,1,42,45}},{{2},{2,7,36,38,40}},{{3},{3,9,31,33,35}},{{4},{4,6,11,13,16,29}},.........}

Value Positions
1 0,1,42,45
2 2,7,36,38,40
3 3,9,31,33,35
4   4,6,11,13,16,29 ......... and so on with unique keys and multiple or not values.

My code do this, but looping all over the string there a moment when it repeats values and positions, because already found them earlier. How do I make to keep just the UNIQUES? How do I skip the loop when the value is already in?

My code below
Public Class Form1
Public myString As String = " "
Public jagged()() As Integer
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
myString = "1123464263948465475965069068547363532627281901"
jagged = New Integer(myString.Length - 1)() {}
[Code] .....

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Aug 21, 2009

I have for-next loop that loops 6 times around before exiting. Each time it loops it adds a small number and a space to a string so I end up with a string containing 6 numbers separated by spaces. Whats ends up happening is I get "555 555 666 666 777 777" when I should get "444 555 666 777 888 999". I know for sure it isn't the code that generates or applies the numbers because when you put a at the end of the loop it works perfectly, so it seems to me something is happening to quickly but showing the message box every loop gives it time to catch up. What can I do here?

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Oct 8, 2011

i am currently having two problems with this assignment. The program allows the user to add new students to a listbox with a unique Id, lastname and test average. When adding a new student to the listbox, part of the assignment is to not have duplicate students added. I am currently stuck at trying to figure that out. I have figured out how not to have duplicate courses under the course information form but when trying similar code for adding a student i cant get anything i try to work. the next problem is when searching for a student from the list and clicking on the Course Information button, the course information added for that student needs to be displayed. My problem is getting the student searched information to show up right, but if i add three students and search for the first one i added and click on course information button it only shows the last student i added. this is my code for the whole program

Public Class Form1
Private allStudent As New List(Of Student)
Private currStudent As Student


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Jan 27, 2011

I'm trying to create a "LOTTO" number picker, but I don't want to have more than one TextBox. And I also don't want duplicates in that single textbox. The program randomly picks six numbers from 1 to 30 (Sorry I don't have the code at the moment).

My code runs fine, but I keep getting duplicates in the textbox. (I'll update as soon I have the code.)

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Apr 28, 2012

I have a String which contains the following[code]...

give me a VB.NET code for this?

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Feb 23, 2010

I fail to remove duplicates from my List. What am I doing wrong?

Dim Contacts As New List(Of Person)
' remove duplicates '


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May 31, 2011


I build up the ItemList array with the above code. How do i remove any duplicates in this array?

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Remove Duplicates From String?

Sep 1, 2009

I want to remove duplicate values from a string using VB.NET. If values = "3,40,15,109,15" then I need the end result to be "3,40,15,109". I'm using the code below but receiving the error message 'Value of type 'String' cannot be converted to '1-dimensional array of String' and I'm not sure how to proceed.
Dim values As String
values = lblIDList.Text
'Remove duplicates
values = RemoveDuplicates(values)


Value of type 'String' cannot be converted to '1-dimensional array of String'.

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