Detecting And Deleting Duplicate Entry's In A ListView?
Jun 14, 2008
I need help on improving the performance of a program I wrote some time back. This is the main performance issue of the program below. Basically I need to look through some data that is displayed to a user in a list view and determine if the data is a duplicate of any other data in the list. If it is I need to delete the duplicate before my program continues.The below code does the job just fine, however the list view of data has approximately 30,000 rows of data. Hence looping this list 30,000 to the power 30,000 times makes the program very slow. Note subItem(4) in the data is the "unique" identifier that I later discovered was not so unique....
This was a work around function implemented in the code back when I wrote it (not meant to be permanent). I know that listView is not Ideal to store this much data.how to store the data in a more efficient manner or improve the performance of the Search and Delete [code].....
I want to add all the records from table1 to table2. I want to do this 10 times if I execute the following statement: INSERT into Table2 SELECT * FROM Table1 ; Everything works perfectly. The two records are added to table2 But if I execute the stament a second time get the following message: Duplicate entry '1' for key 1 I now i must do something with "duplicate key update" in the Insert statement.
The following solution should allow the user to enter 'colors' to a combo box; however, if the color is already entered (in an upper, lower case or mixed case format), then the 'Duplicate Color' message should be displayed. I get the message, but my color is also being converted to an upper case format in the combo box.
I want to make a very simple program that remove duplicate domain name from a txt file. First, it must have a Open file Button so that it can load list of url to Listbox.
So, the URLs will be loaded into listbox. Then It has 2 more button Start and Save button Lastly one counter to calculate how many URL in that listbox
So example.. let say I have a txt file which contains URLs
[URL]
I open this txt file and loaded it into listbox (can scroll)
Then when I press start button, it will delete the URL that has same domain name. so the output will look like this
[URL]
Then I can save the URL from listbox to my disc drive as text file
I am trying to create the code which will stop duplicate entry of an Account Number being entered in the column 'Account Number'. The user is to input an account number (three digit account number i.e 153) using an input box and this will then be printed into the A column.What is the best way to prevent duplicate account numbers being entered?
The code I have for the input/account number array so far is:
i have to make a program thats a telephone directory. All the information is in different text files. The user has to be able to delete and add people to the directory, i have made it so they can add peple no problem but im having a hard time with the code for deleting them. The questions requires that they only type in the persons name and then they are delted but in the text file they are listed as Fred,123-1234 so when they hit delete the person does not get deleted becuase it is registering there full name as Fred,123-1234 i need it so that it just sees the word Fred and deletes it heres the code. I cant figure out how to do it itried using a query but that didnt work either it just looped infinitely.
Private Sub btnRemove_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRemove.Click Dim Removename As String = txtName.Text If Removename <> "" Then
I am trying to create a small form that will duplicate a users entry for them.On my form i have a text box and two CheckListBox controls and a button. The user should be able enter a value into the text box, and select multiple items from both CheckedListBoxes, when they click the submit button the details will be added to a DataGridView below.
This is an example,The user enters the value Audi A4 into the textbox.
The First Checked Lsit Box is called "Colour" and from the options the user checks 'Red' and 'Blue'.
The second Checked List Box is called "Number of Doors" and from the options the user checks '3' and '5'.
When the User clicks the submit button 4 rows will be added to the DataGridView with all the different combinations, as shown below:
Model Colour No# of Doors Audi A4 Red 3 Audi A4 Red 5 Audi A4 Blue 3 Audi A4 Blue 5
I am currently using this to populate the DataGridView:
I am working on DataEntry Forms in VB.NET There are two controls are having in a present window. One is Combobox and one is Textbox. Combobox values are Mobile, FAX, E-mail. By the mistake some one enter the values like , In the combobox-E-mail and in the Textbox-9987453434. Finally these are saved on the Database. But i want to Re Enter the values.
For this i was selected in the Combobox-Mobile and in the Textbox-9987453434. These are the right values i want to save on the database.
But here the problem is that Phone number column(Textbox) is Indexed. (Unique) or No Duplicates in the database. Now i want to update only one column which is coming from Combobox in the database.
When user inserts a duplicate entry in a unique field, Castle ActiveRecord throws the following exception: Castle.ActiveRecord.Framework.ActiveRecordException was unhandled Message="Could not perform Save for SerieNotaFiscal" Source="Castle.ActiveRecord" StackTrace: [Code] .....
I am adding line entries in a .ini file. The problem is, I am creating duplicate lines in the file, which I do not want to do. I searched this issue online, and the consensus is to use an array, loop through for duplicates and create a new file. However, being so new at this and teaching myself how to code no less, I am at a dead end. This is not a school project, it is something I am doing for work on my own time. I have all of my code done for the program except for this last step.
eg: there are listview1,listview2 and a button1 .u can send items to listview2 from listview1 .if the listview2 has an item button1 will enable if the listview2 is empty button1 will disable
what is the suitable event for this?? (there is an event called BindingContextChanged is it the suitable event?if so how to use it??)
I have a listview, and when you right click, it shows some things. I need to make it see if an item on the listview is selected. Is there a way to do this?
Like, this doesn't work, but in code it would be like
If listview1.HasItemSelected = true then'code here end if
I've been using 'GetScrollInfo' to find the position of the scrollbar on a ListView and I can detect when it hits the bottom of the list. Is there anyway I can raise an event when the scrollbar changes? At the moment I have it working by using a timer but I would rather if possible create an event to fire my routine.
Just lately I've been 'playing' with entering data into a ListView and I have come up with the following code which seems to be OK. Can anyone see if there is any fault with it?
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.
on button.click event,Dim category As New ListViewGroup(cbType.Text) If Listview.Groups.Contains(category) Then Arggh! this should work. Listview.Items.Add(lvi).Group = category
Else Listview.Groups.Add(category) Listview.Items.Add(lvi).Group = category End If
If cbType.Text was "Dog", it will add another "dog" group header every time I add an item having selected dog, when I want to add the item to the existing dog group.
check item listview to avoid duplicate item in database. I have 1 listview, my plan the listview checking each item from database before insert to database. and item in listview obtained from opendialog excel this is my code : when items duplicate already exist, my app error/stop at cmd.ExecuteNonQuery() and I'm hopeless to code check each item when reportcode exist in row of 5 or other row
Private Sub BBIUpload_ItemClick(ByVal sender As System.Object, ByVal e As DevExpress.XtraBars.ItemClickEventArgs) Handles BBIUpload.ItemClick Dim iCount As Integer
I was generously guided by the community to use LINQ to find duplicates on my listboxes the last time around. However, I am now in a tough spot because I need to find and remove duplicates from a multicolumn list view. I tried using LINQ but it says that the listview object is not "queryable". Is there a way for me to find and remove duplicates using only one column of the listview? [code]The code now runs fine when I call it. But it does not remove the duplicates:
I am populating the list view using mysql and i dont know how to avoid duplicate rows. Private Sub Btnrefresh_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btnrefresh.Click Using connection As New MySqlConnection(";") Using command As New MySqlCommand("SELECT Distinct name, type, uploaded, uploader, location FROM programs", connection) connection.Open() [Code] .....
I am working on creating a program that records animal data (wombats) and stores it into a database, using vb.net. I am trying to add new records into a database but every time I click add, to execute that, there are duplicate records that gets added. How do i write the code so itonly adds it one time. I am using a data reader. Here is the
I have a list view control on one of my forms in my program.If i click on a selected item and click on the delete button it gets removed. But i want it so that if i havent got an item selected i click on delete i get a message box telling the user to select an item to delete.
I'm a beginner, and this is an assignment - I have a form with a menu strip and a listview.I also have a separate class that handles everything.When there is data in the listview, and one row is selected, I need to be able to remove that row when delete is clicked in the menu strip.The code I need to use for the delete is below. Currently it's just sitting in the class, and I don't know how to use it.
Public Sub Delete(ByVal item As employee) If IndexOf(item) >= 0 Then '"IndexOf" looks for item, returns -1 for not found DeleteAt(IndexOf(item))
My program takes a checkboxed item and depending on the serial number that is present on the item on the invoice, subtracts one from the amount list I have the following in a listview on a details page which I added with the following code:
Right now it doesn't look like it does anything. I have tried changing my index's on my subitems to 1 and 3 instead of 0 and 2 but i figured because they are subitems that they need to be subitem index 0 and subitem index 2 since there is one item and three subitems to that one item.
Im having some trouble figuring out how I should delete these items. I want it to delete the one I have selected in the listview and delete the corresponding item in the DB. Ive tried various combination's and this is the latest one I have:
[Code]...
So where am I messing up? I keep getting errors no work done but when I close the form2 and open it back up no DB items show up in the Listview. But I close my project, and open it back up and they're back. All while never changing in the DB.
