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.
I have searched the forums for an answer to this problem and while I have found simalar issuses, I have not found a solution that works for me. I have created a dataset and populated it. I know that this is true because I can view the information in the dataset in other ways such as using labels or textboxes. However to display the data in a organized and usable way I would like to display the information in a DataGridView control. I DO NOT need to be able to modify or add anything to the datagridview, JUST view the information there. I am not using any wizards to complete this and so I need to be able to complete everything programmaticly. I have written the code involved to the best of my understanding. When I run the application, there are no crashes or errors thrown, I just can't get the datagridview to populate. Below is the code that I am currently using:
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]....
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.
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.
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
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.
Dim xmldoc As New XmlDataDocument() Dim xmlnode As XmlNodeList Dim i As Integer Dim namestr As String
[code].....
Lately iv been experimenting with XML and VB.net so far so good but not I tried to get it to work with a dataveiw and im confused becasue iv never used one before and wondering why it populates the wrong places like so...like those numbers are spose to go into the ID box and I am spose to get the names in the Name box but it isnt...?
so i started a program yesterday and after a whole day of tinkering with codes i have realised that something was wrong with my old program and i have started again.
I'm trying to display the population of a city, as soon as it has been chosen in the combobox.I put it on my formload, and it will always read the index of -1 since it hasnt had a chance to be chosen, how would I bypass this without a button being clicked?
If cboCities.SelectedIndex <> -1 Then lblCurrentPop.Text = "The current population is: " & CStr(intPopulation(9)) Else MessageBox.Show("You must select a city!")
Im trying to create a treeview with data from an access DB, the tables are structured and related as followsfor example - What i need to do is populate a treeview to look like this, remember all nodes will be have variable number of children (if any)
I have a winform that has one combobox. I want to populate that it with a list of folders in a directory. I thought this might be a common thing but I have not found any thing concerning this.For this example lets say the root folder is C:TestingFolder ListIn the folder "Folder List" directory there are 5 folders as such:
I have data codes in the format abcd123, abcd345,... present in the table Info of database.I want to drop abcd from code and display remaining code in a combobox of datagridview.
Code:
Dim dsCodeList As New DataSet Dim dtCodeList As New DataTable
[code]....
It is giving error at first statement inside for loop saying Column Code Does not belong to Table Info.If i write simple query without use of right function and use dtCodeList.Rows(i).Item("Code").substring() to ignore first 5 characters, it works well.
Create an application that will predict the approximate size of a population organisms. The user should select or enter the starting number of organisms in a combo box, enter the average daily population increase (as a percentage) in a text box and select or enter the number of days the organisms will be left to multiply in another combo box. For example, assume the user enters the following values:
Starting number of organisms: 2 Average daily increase: 30% Number of days to multiply 10
The application should display th following table of data.Day Approximate Population 1 2 2 2.6 (table should list values up to 10 days)
Be sure to add appropriate ToolTips for each control on the form.Input validation: Do not accept a number less than 2 for the starting size of the population. Do not accept a negative number for the average daily population increase. Do not accept a number less than 1 for the number of days the organisms will multiply.
1. when i pick a value from a combo in next col of data grid which also have a combo should populate conditionally.
2.when i edit the cell having combo previous selected value is overwritten by first value of combo it should be if i select any value from combo but should not over written default as i click the cell. (edit mode is on click)
3.by pressing enter key cursor should jump to next cell in same row . means navigation should horizontally but should jump to first cell of next row if cell is last cell
I am using the tutorial posted here for my database testing. I have gotten it to display the data using a messagebox but it just goes through them 1 by one. I want it to display all the data from the database in a table on my form.
Using connection As New SqlClient.SqlConnection("Server=71.200.87.112MySQLExpress; Database=database_test;User ID=sa;Password=greddy6;Trusted_Connection=False;")[cod
Something happened to my VS2005 setup and now the first time load for F1 can take a full minute to load. I think the last significant thing I did was install an add-in for ESRI ArcExplorer. I uninstalled that add-in but help is stil VERY slow to start.Does anyone recognize the problem and have a simple fix?
Is there any way that i can be able to get the ExecutenonQuery to Execute faster. Am using it to run mysql queries that have joins from diffrent tables. As I have come to notice, the user has to wait a while before the statement ExecutenonQuery can be completely executed.. is there any way that I can get it to execute faster?
Im using VB2010 professional edition and Ms Access 2007 DB. Main form contains a button which accesses database, fetch results in textboxes and update database. But sometimes it takes almost 40seconds to fetch and sometimes it fetches immediately. Couldn't understand any pattern for this. The table in the database contains 8000records and Main form has 3000 lines of code.
We have old VB6 code, and now that Windows 8 is coming along, we are worried that it won't work. So we have to decide what to port it to. VB.net would seem to make sense, but since it compiles to an intermediate level, its not as fast as programs that compile straight to assembly language. Another choice we found was "Power Basic" which is supposed to be much faster that VB.net.
I happen to like various features of VB.net such as the GUI editor, and intellisense and so forth, and so I'm wondering - is there some way to get around the MSIL (intermediate level) factor in slowing the language down?
its' only me, or is VS2010 really so slooow? This taking 50 seconds to open vs2010, 30 seconds to change from an small project to other small project.as a comparation, in the same machine I can open three different vb6 projects, each one in one different vb6 instance and each one takes "only" three to five seconds. of course I can maintain all the three instances opened all the day, sutching from one to other, debugging, changing, even generatin' exe files, without noticeable penalties.machine is Dell Vostro 1700 4 GB, two internal disks, Win Vista business, Intel Core 2 Duo T 7500 2,2 GHz. two years old.
am using system.net.mail to send email as shown below, but its too slow. it takes about a minute to send, whats wrong with my code. Am calling the code below in backgroundworker_dowork. is there a faster alternative, maybe free or open source code
' send the email ' Dim smtp As SmtpClient = New SmtpClient() Dim mail As New MailMessage()[code]............
