IDE :: Datagridview Performance Slow Increment And Decrement In Column?
Dec 18, 2009
i have a datagridview which have 3 columns, two button columns increase or decrease, 3rd displays the value increased or decreased from button. i have datagridview_CellContentClik behind button columns. The problem is increase in value on pressing button is very slow. i mean if i press button quickly the value should increase quickly but its the same slow pace for increasing or decreasing value on pressing button.
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Feb 27, 2011
Trying to use the domainUpDown button. After you insert the button and double click on it you get:
Private Sub DomainUpDown1_SelectedItemChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DomainUpDown1.SelectedItemChanged
End Sub
I know there is an "instance" for each of the up or down button in the domainUpDown tool. I just wanted to know how to increment one for the up button and decrement one for the down each time it is pressed.
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Feb 27, 2011
I would like a program that will use a NumericUpDown button:
-when the up arrow is clicked, the number in the NumericUpDown box will increment by 2 -when the down arrow is clicked, the number in the NumericUpDown box will decrement by -2
I got the button inserted and double clicked on it to get the NumericUpDown1_ValueChanged but am stuck there. I looked thru the MSDN site
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Apr 21, 2011
I've got a DataGridView control that is bound to a datatable. The first cell of each row in the DataGrid is a checkbox. When the screen loads all of the checkboxes are unchecked by default. I have a "Select All" button to check all of the boxes. This is performing very slowly when I have a large number of rows in the grid. If I have 1,000 rows it takes over 30 seconds for them all to be checked. When I had 5,000 rows I gave up after 5+ minutes with no result. To check all of the boxes I am looping through each row of the datatable and setting the first item to True:
[code]...
Since that yielded such slow results I changed the logic to loop through each row of the datagrid and set the cell to True but that took three times as long.
Is there a way to quickly "check all" on a large set of data?
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Mar 16, 2009
I have a program in where I need to loop though the entire dataset.datatable. I takes a long time. What is the alternative I can use to do the some job but faster?
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Aug 6, 2010
while using VS 2008 SP1 for VB WinForm apps (on Win 7 Ultimate machine),I find that while the performance of VS 2008 is on the slow side, it is generally tolerable except for one thing: when selecting an image for a button, the "Select Resource" dialog will come up, and I choose "local resource", then Import. After navigating to the appropriate folder and selecting the desired image,I will almost always get the "hourglass" (now the blue whirly thing),and only after several seconds will the operation complete(i.e. the "Select Resource" dialog will show the image I selected,and then I can close it and be on my merry way). Typically while the whirly thing is going, the dialog box title will say "Select Resource (Not Responding)". Also on some occasions during the wait period, the Select Resource dialog will hide, and I will have to click the VS icon in the taskbar to make it reappear so the operation can complete.
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Jun 8, 2012
In my winform application, I have 2 datatables, both contains 37000 rows. Table 1 has 171 columns and Table 2 has 4 columns. A While loop runs to update values in Table 1 from Table 2 for 4 columns. A For loop runs inside While twice to update values. It takes more than 5 min to do so. which i think should be a task of 5 seconds.
Columns being updated are:
Int64 - 1 Columns
String - 1 Columns
[Code]....
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Apr 2, 2009
I have built an application using VB 2005 express edition with backend Ms Access 2000. In main form(which is loaded on startup), I am having 9 datagridviews, each bound with databindingsources. I am refreshing this data every 15 seconds by refilling the table adapters and updating the datagridviews.Now, this access database is shared in the network and is accessed by about 5-6 users concurrently. There are other forms which are used to edit the data.My problem is poor performance of the application. Its very slow in opening up forms, not responding sometimes and using the network resources fully.
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Aug 12, 2009
We have a project for a client that is written in VB.NET. In one of the projects, we have about 100 modules, which are all VERY simple. They're extension methods that convert between object types. Here is a small snippet:
Public Module ScheduleExtensions
<System.Runtime.CompilerServices.Extension()> _
Public Function ToServicesData(ByVal source As Schedule) As ScheduleServicesData
[code].....
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Apr 19, 2010
I am new to the world of VB.NET and have been tasked to put together a little program to search a directory of about 2000 Excel spreadsheets and put together a list to display based on the value of a Custom Document Property within that spreadsheet file. Given that I am far from a computer programmer by education or trade, this has been an adventure.
I've gotten it to work, the results are fine. The problem is, it takes well over a minute to run. It is being run over a LAN connection. When I run it locally (using a 'test' directory of about 300 files) it executes in about 4 seconds.I'm not sure even what to expect as a reasonable execution speed, so I thought I would ask here.The code is below, if anyone thinks changes there might be of use in speeding things up.
Private Sub listByPt()
Dim di As New IO.DirectoryInfo(dir_loc)
Dim aryFiles As IO.FileInfo() = di.GetFiles("*" & ext_to_check)[code]....
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Apr 24, 2011
I have constructed my database and I have used auto increment the ID's of each column. When I was testing and inserting data into my tables the auto increment of these column's of course incremented.
Now I am looking to start each individual Id column at 1 and not at the number where it is now.
I know it has something to do with using max value and +1. I have deleted the entire table and have tried everything to re-insert my data and start the ID's at 1, but I have had no luck.
Also to,
I know within Vb I can use a datagrid view and add there and it starts at the max value of the column +1, but when I have another form to add data within columns the column number is not in numerical order, How do include code within that seperate form to auto increment ID column numerically?
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Nov 8, 2011
I have a column in access table with numbers ranging 1-11.What I want to do here, is for the subsequent row to be +1.
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Feb 24, 2009
code to auto generate and increament values in a database column?
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May 14, 2009
What i am doing is trying to manually increment a data column with a range of my choice. Say i have a range from 1 - 10. Now with my update query i want to update a column with 1,2,3,4,5,6,7,8,9,10 UPDATE TABLE SET Type = [min_range] to [max_range] WHERE Po = 'A' AND Loc = 'F'; WHERE Po = 'A' AND Loc = 'F' will return 10 records but i want type to be 1 - 10 for those records couple of days trying to get this work and i am using VB 2008 .NET.
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Jan 16, 2012
There are 3 columns(Count,Item,Price) in datagridview which is bound to a datasource. The count is 1 by default and it should increment by 1 when i click on a button,so the count would be 2 if i click button again
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Jun 24, 2010
I have a VB.NET app that has DataGridViews and Drop Down boxes.In VB6, the FlexGrid was fast, scrolling was smooth.Now, in VB.NET, the DataGridView is really slow to scroll through, and the dropdown boxes are sluggish as well.For the interesting bit. If I run Microsoft NetMeeting and either leave it open or click the X to close it (it still stays as a resident program in the system tray though), all the data grids and drop downs work smoothly again.If I actually terminate NetMeeting, they go back to slow/sluggish again.What is it (was it?) in NetMeeting that maybe can be incorporated into my program (some Microsoft library?) that changes how the graphics redraw?
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Apr 9, 2010
How to add a checkbox column at first column of datagridview including column header?After adding, how to code to "check all" or "uncheck all"?
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Oct 4, 2010
I'm using a DataGridView to load data from a DataTable. This DataGridView is located on a tab (Forms.TabPage). When clicking this tab the datagrid takes a second or two to draw from the top down, regardless of wheather data is being loaded or not. Is there anything I can do to speed up the DrawingRendering when clicking the Tab?I Don't think the actual population of the DGV is causing this, as it's filled during form load so by the time the tabs click it would have loaded the few rows (20 - 30) it displays.
Using cn As New SqlConnection(connectionString)
Using cmd As SqlCommand = cn.CreateCommand()
cmd.CommandType = System.Data.CommandType.Text[code]....
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Feb 17, 2011
I've got a pretty big datagridview that I have to populate, and it's already (with not loads of data) taking quite a long time to populate. I can't imagine it's possible in my situation to bind the datagridview to the data I want to populate, but here is the situation.
I want the column headers along the top to be a bunch of users, which I have in one data table. I want the row headers along the side to be skill names, whihc I have in another data table, and the data in the middle is the score of each user for each skill in data table 3. Some users don't have a score, some do.
The way I have achieved this at present is to create the columns first using data table 1, then for each skill (data table 2), create an array of rows from data table 3 that match the skill, find the matching user (ColumnIndex) for each of these rows, and fill in the score.
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Dec 1, 2009
I converted some c# code to vb.net and the converter.telerik.com turned this: i--; into this: System.Math.Max(System.Threading.Interlocked.Decrement(i), i + 1)Whats up with all the fancy-ness?
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May 10, 2011
I am loading data from query into a dataadapter and then into a dataset.the datadridview datasource is the set to the dataset.but it takes too long to load the data into the datagridview.
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Jul 26, 2010
I have this code:
If kivertekhossz = 2 And dgvszamlatukor.Rows(ind).Cells(1).Value.ToString.Length > 2 Then<br/>
dgvszamlatukor.SelectedRows(0).Cells(0).Value = My.Resources.S_CLOFOL<br/>
[code].....
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Jun 19, 2010
A DataGridView in my VB.NET 2008 program contains over 15,000 rows. I loop through the rows, totalling groups of rows and appending 'total rows' and one 'Final total row' to the DataGridView. That works fine. I want to initially hide all rows except for the total rows, giving the user the option to show all 'detail' rows. If i place the statement << dgvTitleCounts.Rows(intRow).Visible = False >> in the loop, execution time increases by three minutes and that is unacceptable.
I see two options: (1) find a faster way of making all rows invisible; and (2) place the total rows in a separate DataSet and bound DataGridView.
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Jun 22, 2011
The following snip of simple code runs pretty slow on my computer, and I suspect that it is due to excessive memory usage, since the program reports using >1GB mem according to TaskManager. Am I using the DataGridView in a wrong way? Instructions: Make a windowsforms application and put 2x button and 1xDataGridView on it. Push button1 and then button2 - sort the data in the DataGridView by a different col and push button2 again. It'll go above 1GB mem usage! Basically I need to display a lot of data to a user and allow the user to sort the data and generate something from them.
Public Class Form1
Public dt As DataTable
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
dt = New DataTable
[code]....
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Sep 30, 2011
I have a datagridview that takes time when loading, and once loaded, is also very slow when using the scroll bar to see the other rows.[code]..
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Apr 22, 2011
i have problem when i generate my program the program takes time till in my datagridview from table adapter in which i already create in a dataset any way how to make the program fill the records faster and decrease the loading time when fill in the datagridview? [code]
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Mar 17, 2008
Do we have increment operators in VB.Net? I want to use post increment and Pre increment operators in VB.Net.I want touse the statement like, i++ and ++i.
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Feb 24, 2010
Add persistence to multible DataGridView in terms of Hide/Show column and column width
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Feb 13, 2012
It seems that on clicking datagridview column header, the column will be automatically sorted based on the column type. I have a column showing some numbers. If column type is string, it sorts "1","20","3" into "1","20","3". If column type is double, it sorts into "1","3","20" which is the result that I want. However, there might be some erros in the numbers and error messages(text) will show in the cell instead of numbers. So I cannot set the column type as double. I want to ignore these error messages and sort all the numbers. How can I do this?
Also, I need to add some background colors to different rows in datagridview. So in the column header click event, I call the bkgColor Sub to achieve this. My question is that how can I override the sorting method in this event?
Private Sub DataGridView1_ColumnHeaderMouseClick(sender As Object, e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles DataGridView1.ColumnHeaderMouseClick
Try
[code]....
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Feb 27, 2009
i have a datagridview with three columns. i set the first column to visible=false, so the user can only see two columns.when the user presses the tab key in the first visible column -- column(1), i want to ignore column(2) so that the user only tabs through the rows in column(1)i can't get it to work. it will always tabs through the rows in column(2) even if i use the column name.
[code]...
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