Datagridview Delete Existing Items
Nov 1, 2010
I have a datagridview i use to load alot of klients into a combobox. The values of the datagridview is a connection to a MySQL db.
What it's suppose to do, is to: When clicking the combobox, it should make a list from the datagridview, getting all the names from the klients.
My problem is that it gets dublicated, and will use to much memory at a moment.
I've tryed to check if the item it was about to add allready existed in the datagridview, if it was, it shoudn't add it again, however my code failed, and I'm having huge CPU and RAM useage when running this problem for more than 30mins.
My code:
Private Sub loadCustomers()
SQL = "SELECT * FROM kunder;"
Try
[Code].....
The code above is only checking for dublicated in the combobox, And I want the code to also check for dublicated items in the datagridview.
Or a way to clear the datagridview right after the items are inserted into the combobox?
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Jan 23, 2012
i want to delete existing data in datagridview using loop . i write code below:[code]but problem is that when data found and deleted row then orginal data index mismatch. and get error. how do make loop in up to down and delete row if match
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Jul 1, 2011
am Working on VB.NET 08 Windows Appl. Present i am Working on the DataGridViewCombobox Column. When i click the Combobox ,Clear the Items Which are having the Combobox and add New Items Manually.
For Example: In the Load Event For each Combobox cells Having a,b,c Items. But When i Click the Combobox cell in the DataGridView the Items (a,b,c) delete and Add new Items X,Y,Z .
How can i delete and add new items when click on the Combobox cell in the DataGridView??
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Apr 22, 2009
How to remove already existing items in the checkedlistbox?
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May 21, 2011
I have a listview which contains information. This information is retrived from database, 'till now ok. The problem is: I must update the existing items on listview and insert the new ones.
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Sep 11, 2010
I'm reading a binary file into a bindinglist of (t); to be bound to a datagridview.Each line in the file represents a single transaction but I need to consolidate and or filter transactions that meet certain criteriaI know how to do this from a mechanical standpoint (looping the list while adding each item, and adding a new item, or merging the data with an existing item), but I'm looking for a practice, pattern, existing components, or something else that I'm missing (I'm drawing a blank for keywords to search).I don't want to reinvent the wheel if I don't have too. I'm particularly concerned with speed and performance issues with 100k plus records to process in some instances.Currently working with .NET 2.0, but will move to 3.5 if a particularly sexy solution exists.
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Oct 17, 2010
I'm trying to figure out what would be the easier method for what I'm trying to accomplish. What I have is in, on the main form, a datagridview that is bound to an xls file. I then have another form that the user can import/paste data to another dgv. This content then needs to be appended to the end of the main form's dgv. Would it be easier to add it straight to the dgv and then save it to the excel file or save it to the excel file and reload the dgv? Or does it matter? I'm not exactly sure how to do either method but I figured I would start here.
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Dec 9, 2009
I have a datagridview that is bound to a dataset by dragging it onto a windows form. I want one of the columns on the datagridview to be read only for existing records (rows), but I don't want it read only when the add new icon is pressed on the navigator. How can I tell when a row is being edited as opposed to being added?
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Sep 3, 2009
I have a simple database with our customers data. I'm using access database, dataset, and a datagridview. So when I selected a row, I want to make a new row with datas from selected row. Here is my code:
[Code]...
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Nov 25, 2006
How can I delete all the selected items in a multi-select listbox in VB.NET?
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Aug 30, 2011
Private Sub btnRemove_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRemove.Click
[Code]...
i was able to delete an item in the listview, but when i refreshed it, it seems that it would not be deleted in the textfile.
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Jan 20, 2010
How is it possible to delete all the items from a ListBox that have the same extension? This is in particular to video files that have have extensions of .mpg, .modd and .moff. I can populate the ListBox with just the .mpg files but I would like to know how I can remove the other file types should I put the whole lot in.Also, presumably using similar coding, it it posssible to highlight all lines with a particular extension?
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Aug 8, 2010
How can I delete items with forbidden words?
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Aug 2, 2011
I am coding a simple database that uses a .txt file as a way to store infomation (It is required to use an external file and .txt was the first one that comes to mind), my question was. Is there a way to click on data in a list box and then delete it from both the listbox and the .txt file?
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Jan 18, 2009
I need code for program which will deleting same items in listbox, for exampe
I really have:
I
You
You
He
He
She
It
And I want to have:
I
You
He
She
It.
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Feb 20, 2012
why when i press the delete button the code does not delete items and if i add items the items are not added from the database.
Public Class Form1
Dim inc As Integer
Dim MaxRows As Integer
Dim con As New OleDb.OleDbConnection
[code]....
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Apr 17, 2012
I have created about six invoices. Listed on these invoices are checkboxes that contain items that are listed in a listviewbox on another form. I want to be able to click the checkboxes next to these items and the inventory list decrease in amount... ill show you how i created my boxes and then my coding for my checkboxes...
This is how I added items to the listview
Private Sub ItemDetails2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim items As New ListViewItem
[Code].....
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Aug 4, 2011
in my tableadapter query i have a count function "COUNT(PRIMVENDOR)" to give me the number of rows in each group by:
SELECT VENALPHA, PRIMVENDOR, [GROUP], COUNT(PRIMVENDOR) AS GrpCount
FROM ViewCurrentMasterFile
WHERE (PRIMVENDOR = @VenNum)
[Code].....
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Jan 1, 2011
What I am trying to do is update existing records in a dataset with an unbound datagridview. It updates just fine but I have added a simple backcolor change for errors. What I don't understand is it will update fine but throw the backcolor = red at the same time. Am I overlooking something here?
vb.net
For Each dr As DataRow In Form1.DbDataSet.Tables("tblInventory").Select() For Each row As DataGridViewRow In DataGridView1.Rows If row.Cells("colInventoryID").Value = vbEmpty Then 'Do Nothing Else If dr.Item("Inventory ID").ToString() = row.Cells("colInventoryID").Value.ToString() And
[code]....
I'm trying to get this working in a test application before adding it to my main project, so that's why the names of controls are the way they are.The errors I'm trying to show are if "Inventory ID", "Cart" and "Shelf" do not match. When they don't match it doesn't update, which is what it is supposed to do. However, if they do match they update just fine but also show the Inventory ID error. If I comment out that ElseIf for the Inventory, it throws the Cart error. It's like the ElseIf blocks get called even if the If statement is true...
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Jun 6, 2011
I have a small application which has a MS Access as backend, and the front end is developed using VB.Net 2008. When I click on the listview item and then click delete button to delete a particula list and its content on the database, it is giving me the error as "No value given for one or more required parameters". My access database have a Primary key as the first character of the firstname combined with the first 2 characters of the lastname. It does not have a Anutonumber fiels. My code for the delete button is as follows: the code was working fine on a MS Access that has a Primary Key as the AutoNumber being generated.
Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click
If lvData.SelectedIndices.Count <= 0 Then
[Code].....
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Oct 14, 2009
I have a series of files in different folders. Is there any way to open these files automatically search for lines containing fullBod and delete them completely? Then, close the file and save the changes? This tool should be able to process several files at once in a directory. clock [t= 83] SetSwitch [figure= fullBod switch= walk_across state= 01]
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Nov 11, 2009
I somehow lost a MenuStrip & StatusStrip from my form. Now I have all these MenuStrip items in the dropdown box of my properties window & I can't seem to delete them.
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Jun 16, 2009
I want to know to how to delete duplicate items in menubar?
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Jun 28, 2010
I add several unbound columns to datagridview,i've succeeded to copy data from other datagridview to this unbound dgv and also got save database from unbound datagridview to database using tableadapter.insert worked .But i can't figure out how to display the data back into the datagridview with existing column..I've tried using this way :
Try
Dim cn As OleDbConnection = New OleDbConnection_
("Provider=SQLNCLI;Server=.SQLEXPRESS;Database=salon;Trusted_Connection=yes;")
cn.Open()
[code]....
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Jun 18, 2012
i want to delete an item on a listview, this is my code
If ListView1.SelectedItems.Count > 0 AndAlso MessageBox.Show("Do you want to delete this item?", "Confirm", MessageBoxButtons.YesNo) = Windows.Forms.DialogResult.Yes Then 'make sure there is a selected item to delete
ListView1.SelectedItems(0).Remove()
End If
now my problem is i want to delete that item on the text file line
( using streamreader and streamwriter)
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Jun 19, 2010
I'm working on a To Do List program of sorts. I currently have a CheckedListBox on the form with an Add Button and a Delete Button. I send the items to an array and then use that array to fill in my CheckedListbox. This all works.
I wrote the following code to delete items:
Dim summarylistboxindex As Integer
summarylistboxindex = SummaryListBox.SelectedIndex
MonkeysTasks(summarylistboxindex) = String.Empty
[Code]....
I use a variable called INTCOUNTER to keep track of my position in the array.
My question:
How can I use the second piece of code that deletes multiple items at once from my CheckedListBox AND delete the corresponding entry in the array?
ie if my checkedlistbox items were Apple Orange and Banana
I want to delete Apple and Banana at the same time and then remove them from Fruits(0) and Fruits(2) at the same time they are deleted from the CheckedListBox.
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Aug 21, 2010
In my project, I want to use Coordinates of a place (eg; London) which is selected from a list of several thousands of coordinates of places.
I thought of using comboBox / ListBox to display the list of the coordinates of places.
I want to know how to make this "editable"; ie: anyone using this program should be able to Edit / Add / Delete a coordinates of a place. And the newly added Place should be saved so that he/she can use it whenever it is needed.
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Apr 13, 2012
I am making some kind of calendar where I can add tasks, so I can easily organise my tasks. For it to complete, I have 3 things I can't figure out how to do it:
1. When I launch the program, I want the items in my listbox to be sorted alphabeticly.
2. I want to save the items in the listbox, so if I close the program and reopen it the items are still saved in the listbox.
3. The items in the listbox all start with a date, fe. "13-4" for today. If that date already passed I want that item to be deleted.
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Nov 11, 2010
I need to make a program in vb that takes a 1 page existing pdf that i specify and inserts that into another existing pdf that i specify.
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Jul 14, 2009
I use this code to delete row in datagridview. but it is error :
Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index[code]...
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