VS 2010 - How To Remove Duplicates In ListView

Jun 7, 2011

Ok, I found some code online on how to do this, but they only compare the Listview.item.text, and they don't care what is in the entire ListViewItem. Is there any code to remove duplicates in a ListView that checks to see if all the subitems are the same as well and THEN removes the entry? [Code]


VS 2010 - How To Remove Duplicates

Sep 3, 2010

just to finalise this, how can i remove duplicates? i have tried this:


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Apr 6, 2012

I have the following coding in place which basically edits my text file, however with the information that is shown in the text file I want to remove all duplicates, is this possible?

Dim path As String = "c: est1.txt"
Dim sb As New StringBuilder
Dim sr As New StreamReader(path)


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VS 2010 Remove Duplicates From Listbox?

Sep 27, 2010

I started programming Visual Basic .NET a few weeks ago. I wanted to make a tool to remove duplicate lines from a listbox. I have the following

Dim strItems As New List(Of String) 'Make a list with originals
Dim strDup As New List(Of String) 'This list contains the duplicated lines

For i As Integer = 0 To ListBox1.Items.Count - 1

LabelChecking.Text = "Checking for duplicates: " & i & "/" & ListBox1.Items.Count - 1
If strItems.Contains(ListBox1.Items(i).ToString) Then


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VS 2010 Remove Duplicates From Text File?

Nov 17, 2010

I'm trying to make a snippet that will remove duplicate lines from text files. However, I seem to be mixing my for loops up.. does anyone know a simple way that I could do this?

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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 datatable.to 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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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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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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Oct 2, 2011

2.0 28 Blue (2 14.00 63.0) [2 12.43 54.3] 42111 9275 55111 -1725
2.0 28 Blue (2 14.00 64.0) [2 13.50 55.3] 40611 9275 53611 5775
2.0 28 Blue (2 14.00 58.0) [2 12.21 54.3] 49611 9275 55111 -3225


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Feb 10, 2012

Depending on the data being used, I can have up 10,000 items in each of the 2 ListBoxs. I need to find and remove any Duplicates between the 2.I am currently using the method of select and Item from Listbox1 and search in Listbox2. If I find a match, then remove both items. This goes back and forth until all the duplicates have been removed. This take some time.Currently have the code in Old VB6 and VB2008 Express.

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Read From Textfile And Remove Duplicates?

Jan 16, 2009

I have my code it is able to read a text file and do checks each line if there are 7W and 5L in that particular line, if no matches it will remove that line... 1 problem i face now is that, there are duplicates in my textfile..Im not sure how am i going to remove the duplicate in the text file. I want to know if there is a way to integrate an additional function inside my code to check if that particular line is a duplicate so i can accomplish 2 tasks at 1 time... Since there are about close to 1million records in my text file.


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Oct 7, 2011

Consider my data table

ID Name


Final Output is


How can i remove the rows in the data table using Vb.Net

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Apr 23, 2010

This seems like a simple question, How do i remove duplicates from a string collection?

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Mar 1, 2012

I have a dropdownlist with some duplicate items on it. I intended to remove them by using LINQ, but do not know how to do it.

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Feb 26, 2010

I know how to remove duplicates in an array (have a simple function for that) but now I was trying to do the same in a matches collection and I can't get anything to work somehow.

In this case the matches collection has a few duplicates that I want to remove.

Dim matches As MatchCollection
matches = Regex.Matches(sExtractedText, "word=""[dw]{8,30}""")
For Each match As Match In matches


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Sep 8, 2009

I have a semicolon delimited string (e.g. an EMail Address List returned from a database or a textbox). How do I separate the string into an array, sort, and remove duplicates? The code below works to separate the string and sort the results, but doesn't remove the duplicates. I could probably then loop through the array and copy to a new array to eliminate the duplicates, but there must be a better way to do this using the VB.Net Array, String, and Collections handling classes.

Dim s As
String =
"Test; Test8;Test1;Test2;Test3; Test8;Test4;Test5; Test6"


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VS 2008 Remove Duplicates From A Listbox?

Dec 15, 2009

i have a listbox and i need to remove duplicates (that can be more than 2)
i try this way but doesn't work...

For i = 0 To ListBox2.Items.Count - 1
For j = 0 To ListBox2.Items.Count - 1
If ListBox2.Items.Item(j) = ListBox2.Items.Item(i) Then


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VS 2008 Remove Duplicates Of 2 Listboxes

Oct 22, 2010

the question states im looking to remove duplicates from a textbox in the sense that i have two textboxes like this


My goal here is to remove item 1 and 3 from the first listbox if it exists on the 2nd listbox, ive searched for 30 minutes to no avail, found a similar question on how to do it in vb but still didnt give me a idea on how to do it relating to vb.net also this is more then one instance,


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Avoiding ListView Duplicates

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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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 24, 2011

I have 3 list views: (steps)

1...One column listview_AllAddresses, read from several .txt files containing email addresses (creating a list with duplicate entries)

2...One column listview_RemoveFromList, containing email addresses populated by textbox add or drag and drop from listview_AllAddresses (working)

3...One column listview_DuplicatesRemoved, where final list is to be diplayed without duplications entries and (no code yet) items from listview_RemoveFromList removed as well

4...Write to a .txt file containing adjusted list of email addresses

Private Sub Button_ImportSource_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_ImportSource.Click
OpenFileDialog1.Filter = "txt|*.txt"


Results are that I get is an exact list moved from ListView_AllAddresses to ListView_DuplicatesRemoved.

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Mar 31, 2012

How can I remove the "ListViewItem: {" when copying from listview?I am copying them to a listbox from a listview and when I do this is what it looks like

ListViewItem: {myitem}
ListViewItem: {myitem}
ListViewItem: {myitem}
ListViewItem: {myitem}

want it to just be


I thought that this would work but it doesn't for some reason

For i As Integer = 0 To ListBox1.Items.Count - 1
ListBox1.Items(i) = System.Text.RegularExpressions.Regex.Replace(ListBox1.Items(i), "ListViewItem: {", "")

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Sep 7, 2011

I'm having an issue wherein my combobox is populated from a datasource (access database >> [URL] and unwanted duplicates are shown.

-Example- [URL]

How can I make it so no duplicates arise?

Also on another note...I'm having difficulties linking the 2nd combo (model) to the first (make).

I would like the program to function in such a manner that

>makeCombo is populated from the database
>the user selects the Make of the vehicle from makeCombo
>modelCombo is populated from the database according to the make selected
>the user selects the Model of the vehicle from modelCombo
>user hits search
>datagrid is populated with appropriate vehicles

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Aug 4, 2011

I'm new to the forums and VB programming in general, so I only have a very basic understanding of VB commands, but I still have a good grasp on logic and the like. I'm doing this for a school assignment, and I am in a bit of a pickle.I am trying to generate an array of 6 random numbers from 1 to 30, making sure there are no duplicates.I think I'm pretty close to cracking it, but it still doesn't work.Here's what I have at the moment:[code]......

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Mar 6, 2011

So I have the

Option Strict On
Option Explicit On
Imports System.Data.OleDb


And the registration part works fine, but my only problem is that if someone registers twice with the same email, it will create another cell in Access, causing me to have duplicates.

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Aug 24, 2009

Is there an easy way to search through a List(Of Integer) and find duplicates? Or do I need to do loops to search through it with each number, comparing it to each one?

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Dec 21, 2010

Below is the code that will and does add to listview1 when triggered, but, will not remove it. I have spent a lot of time trying to figure this one out. There is not any error even when I step through.[code]...

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Feb 4, 2012

I have a listview that has multiple entries and each entry has 2 subitems. I am wanting to know how to remove each item in the listview where the subitem(1) equals a certain string.

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Jul 18, 2009

I am using vbexpress 2008. I have two queries. How a selected item of a listview can be removed? when there are more items than the height of listview an there is scrollbar how focus can be set on the last item of listview every time a new record is added in the listview?

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Dec 26, 2011

I'm trying to remove items from Application Settings using a ListView.[code]...

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May 28, 2012

i don't have any idea how to remove or prevent duplicate item in a listview when ever you update it or insert value to your data base.

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Apr 11, 2009

I have a listview I populate using a button and a textbox. I want to use another button (btnClear) to select and remove the last entry from the listview if there's an error.


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Jul 10, 2006

i've got this code to remove all selected items in a listview... but i like to know if there is any more simple code to do this ...

My code:

Dim i As Integer
With frmMain.FeedsList
For i = 0 To .Items.Count - 1


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Jan 12, 2010

Imports System.Diagnostics
Imports System.IO
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Nov 25, 2009

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Jun 9, 2011

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Apr 10, 2010

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