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.
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] .....
How can I Avoid Duplicate values In datagrideview. IF found dublicate values in will change the row backcolour and show me the rows.
View 1 RepliesI'm currently using a timer to check for the time of midnight.At midnight each day I have to add a bunch of records into a database.My windows form program will be POSSIBLY running on multiple computers at midnight, meaning I may get duplicate records, because each running program will detect midnight at the same time and add the records accordenly.
View 3 RepliesHow 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".
View 6 RepliesHow 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
View 4 RepliesI state that I am Italian and I am using a translator.
I have a problem that I can not fix.
I have a listview with a group. The property view is SmallIcon
On my windows xp everything works perfectly, but I tried the same thing on Windows 7, and I have this problem: When I add a bit of items in the listview I have some strange display problems, no errors.I made some screenshots to let you know
I want to know if it is possible to nest groups within a listview. I started with a listview in my application that contains list types and this worked fine. I have now been asked to group by Product, then Week Commencing and finally by List Type; This would envolve a 3 group nest and i just cant figure out how to do it (if at all possible).
like so...
Rods
1st Jan 2009
Shakespeare
listview items 1
[CODE]...
If what I am trying to accomplish is beyond the listview control, can anyone suggest a possible avenue to explore?
Any snippet of code for adding groups at run-time to a listview. I am currently listing books (and stats) without groups via the following code which is executed in a loop (one pass per book title).
item = New ListViewItem
item.Text = seq.ToString
item.SubItems.Add(Mid(titlenode.Nodes(N_CSTAT).Text, 3))
item.SubItems.Add(Mid(titlenode.Nodes(N_JSTAT).Text, 3))
item.SubItems.Add(titlenode.Nodes(N_PUBLISHED).Text)
[Code] .....
The listview is set to details view. What I want to do is group the book titles by series. For example, books by Michael Connelly may be grouped by "Harry Bosch", "Jack McEvoy", "Mickey Haller", etc. I can create a new group for each new series by
groupnum += 1
group = New ListViewGroup("group" & groupnum, _
System.Windows.Forms.HorizontalAlignment.Left)
group.Name = "group" & groupnum
group.Header = series
But I cannot find how to add the group to the listview and add the new item to the associated group.
I constructed a form with a listview and programatically added items and groups to it. It worked perfectly. I have now made it an MDI child form and the grouping disappears. I even removed my code and simply added groups and items through the form designer. The items display fine but not the groups.
View 4 RepliesI hava a Listview1 component. I want show all group exits in listview, because if not exits item in listview then group not show.
View 1 RepliesUpdate: (Please vote to close) This question is unresolved, and is likely a list view bug.It can be replicated by using the example code from the MSDN link below, and adding this code after the list view initialization code:
myListView.View = View.Details;
myListView.Columns.Add("Column1");
myListView.Groups.Add("group", "group");
[code].....
i want to make the listview control collapsible to the groups alone. Like in Vista's My Computer, where only the group names are shown and then we click on the group to expand it
View 3 RepliesI have a program where you have three entries, CD name, artist, price and it goes into a listbox and .txt file when closing. I have to have a message box if you enter the same CD name. I have a code to open the .txt file and compare strings but I need to change it to compare only the CD name and not all three entries. Is there a way to do my string compare against my listbox without opening the .txt file?? The program loads the listbox from the .txt file when opening. Private Sub btnAdd_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAdd.Click' adds CD information to the list box
' declare variables
Dim strName As String
Dim strArtist As String
Dim strPrice As String
[code].....
I am currently using VB 2008 and there is a form I'm using which contains a listview control. I am dynamically filling the listview with groups and items. After I fill it up, it is supposed to look like this:
[CODE]...
Each item is specific for each group. The problem I have is that when I maximize the form to full size, and everything expands, the items change positions into something like this:
[CODE]...
How can I make the listview keep the items in the "row" view always, instead of the "column" view whether I maximize or not?
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.
View 5 Repliescheck 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
[Code].....
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 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:
View 1 RepliesI have this code to delete the duplicates but i am stuck on how to firstly combine the subitems before deleting the duplicates.
vb.net
Dim DuplicatesList As New List(Of String)
For Each item As ListViewItem In Me.lstTakeoffList.Items
[code].....
I have this data in txt file and the data keeps changing all the time.
[code]...
I would like to read all lines and compare, if the same name and same address is found, which is in the [......], then i need to count it and show the most frequent buyer!should i read it all and put in array, and compare and put the duplicate data and count into another array?
I have a List object and I want to remove the duplicated items but leaving at least one of the duplicated items in the list;I wrote something like this however I would optimize this code for better performance, is there something faster?
Const chars As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
Dim rnd As New Random()
Dim mylist As List(Of String) = Enumerable.Range(1, 100).Select(Function(i)
[code].....
I'm throwing errors when I call this function before running my calculations:
Function CalcValidation() As Boolean
' Didn't want to leave something out, so I needed a validation to ensure that a selection
' had been made for each component.
[code]....
I have a block of related sub routines I would like to "group" together within class to make navigating a littel easier. When I say group, I mean achieve the same functionality of being able collapse and expand a block of code as would with single procedure or class. Two alternative ways I can think to accomplish this is either use a partial class for those procedures or use namespace. I just wanted to see if VS for VB.Net had another way to be able group and collapse blocks of procedures.
View 3 RepliesI have a contextmenustrip. I want to create many groups items in that contextmenu. I mean Line which separate each groups. I can do that in Dotnetbar. but with contextmenu in win form I cant.
View 2 RepliesI have a string of hexadecimal numbers that is generated by the program which I created.
B 53 D0 A1 58 3 DA AF E2 15 9E E 68 F0 65
Given by:
HexText = HexText & " " 'the space makes the characters separated into groups
I want the single characters "B" and "E" would both have 0's before them so that the text is all in groups of twos. How can this be done?
0B 53 D0 A1 58 3 DA AF E2 15 9E 0E 68 F0 65
instead of:
B 53 D0 A1 58 3 DA AF E2 15 9E E 68 F0 65
I was thinking I might be able to do a for Loop and go through the text and if it's a single character add a 0 before but don't understand the exact syntax behind it:
For i = 1 to Len(HexText.Text)
'If a character in a group of two of the string is not equal to a hexadecimal number, make that character equal to 0.
Next
I would like to get the first N groups elements with Linq of a ObservableCollection, an example trying to get the first 2 groups:
Data example:
GROUP1 item1
GROUP1 item2
GROUP1 item3
GROUP2 item1
[code]....
How, if it's possible, you can make a combobox have groups like the html example below:
<select>
<optgroup label="Swedish Cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
</optgroup>
[Code] .....
I am currently trying to separate my text into groups of 5.For example.
Original text is ABCDEFGHIJK.I am trying to make the output to something like this ABCDE FGHIJ K.Using textbox for it
Is there a way to delete local groups through vb.net? i.e. an equivelant to the c# function NetLocalGroupDel?
View 1 Replies