Datatables And Screen Painting?
Dec 2, 2010
Their system executes a DB query everytime they select something, causing performance issues. So I thought that I would read the superset of data into a datatable, and then whenever they want subsets, simply run against the datatable. I've done some testing and the performance difference is HUGE.The problem is how the screen paints on postbacks. The screen will temporarily go blank then the data will appear as expected. Of course, they don't want the blanking of the screen each time they select a subset of data.
I am currently using a repeater to handle the display of data due to the nature of what they want to display. A datagrid might be a good alternative for sorting functions, but I think it would still blank the screen when it data binds.How do I go about filling the repeater without blanking the screen? Is it even p[ossible? Logically I would think not but I don't have the experience. Or perhaps I can fill a datagrid without blanking the screen on the postback?I'd rather not have to go out to the database every time, but if that's the way to go then I can live with that.
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Feb 19, 2010
I'm writing a simple paint program in VB 2008 that allows the user to create rectangles using MouseDown event to anchor one corner, MouseMove to stretch (or grow) the rectangle, then MouseUp event to complete the rectangle.The last statement in the MouseDown event is Me.Invalidate() to trigger the form's paint event where all the rectangles are drawn (refreshed).
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Jun 1, 2012
I'm having a hard time joining 2 datatables and have the joined datatable as result. First datatable (labels) holds data including a printerid. Second datatable (printers) holds printer references (id > unc). I would like to have as endresult (joined) a datatable with all data from the first datatable with the field (unc) of the second datatable. [Code]
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Jun 29, 2011
BTW this issue occurs in any MS office program when the VB.Net (or even VBA) is processing information.Example: In Excel, a worksheet is displayed on the screen. I start either, a VB.Net or VBA procedure and within 30 seconds the Excel worksheet (previously displayed) blanks out. In both VB.Net and VBA,ScreenUpdating = False. My expectation is that the previously displayed screen would stay static as if I left my desk to get a cup of coffee; came back and the same ole Excel worksheet was still there?Of course, setting VBA Screen Updating = False accomplishes two goals: 1) speeds up processing and 2) saves the user from seeing unnecessary "garbage-processing" steps.Why does VBA or VB.Net ScreenUpdating = False not freeze the screen at the time of its invoking?
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Aug 19, 2009
This is mis system projectcell painting in datagrid when error while calculating datai have made a datagrid with 7 columns firstly 7 r with values 0 at beginning when user enters input then in the datagrid with first 6 columns & 7 one with total i.e. total (column 7) = col1 + ...to Col7now, when the total entered by user is different from total it should match itif same then no cellpainting is done
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Sep 29, 2010
Has anyone ever noticed that when adding many rows to a datagridview the scroll bar has a problem painting and the user can no longer use it? How do I fix this?
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Aug 24, 2010
I downloaded Visual Basic 2010 Express and got familiar with it over several days but the following issues are stumping me:
Where are the art instructions to be found? The ones featured in the examples are pretty basic. I've looked all over but can't find anything.
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Feb 18, 2011
I just finished creating a program where you find the area of a 5 sided polygon. But not I want to actually draw the polygon given the coordinates
Private Sub PI_Estimation_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
Dim myGraphics As Graphics
[code].....
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Oct 16, 2009
Drawing on top of a RichTextBox control has always been a pain due to the Paint event, and related OnPaint() method being suppressed. Here is a bit of code that gets around this issue.The following derived RichTextBox will use a seperate NativeWindow control to hook into the message stream of the RichTextBox, listen for the WM_PAINT message, and then raise the Paint event on the RichTextBox for you.In this way, it is possible to use the Paint event handler of the RichTextBox control to paint on top of the control after it has performed its default rendering of the text.The following code is an initial implementation but appears to be pretty solid so far. 'Based in part on code located at: [URL]
''' <summary>
''' A RichTextBox object which raises, and utilizes, its own Paint event.
''' </summary>
''' <remarks></remarks>
[Code].....
I may continue to expand upon this idea, but I wanted to get the initial code out here as this seems to be the minimum to get the painting functionality to work.Reed Kimble - "When you do things right, people won't be sure you've done anything at all"
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Jan 2, 2010
in the painteventargs of the form, i've got something like this: [Code] i'm getting a very cool gradient effect from red to yellow, but why is that the case? shouldn't the 1x1 portion be totally red? and the remaining pixels be totally yellow?
i'm not trying to paint a 1x1 portion in my form, im trying to know why e.Graphics.DrawImage(bm, 0, 0, 100, 100) doesn't draw a 1x1 red portion on my form through the code provided above. my understanding is that 0,0 specifies the point to draw the image. bm specifies the image actually drawn, which is 1x1 px. and 100,100 specifies the allowed space for the graphics to draw, if this is correct, the first pixel should be red and the remaining 9999 pixels should be yellow but they aren't.
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Mar 5, 2009
I'm not sure if this should be here or in the Graphics subforum. Basically, I want to simulate the monitor(s) going black (it's an immature April Fool's Day prank). My initial thought was to create a borderless form that is the size of all the monitors with a backcolor of black. Then, slowly, increase the opacity of the form. This approach works great as far as the visual effect I'm trying to achieve...the problem is that it's a form. If the form is on top - while you can *see* windows below it - you can't interact with them. I'm wondering if there is a way to create the same visual effect without using a form so that the PC will remain usable while the monitor appears to slowly be getting darker?
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Feb 18, 2011
painting only part of text in cells like my column is NAME and values are bahushekh ,bahushekh1,msdn ,abc etc for that column. Now I want to paint only bahu in Red if it exists rest part will be black
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Feb 28, 2012
I have a panel that has a BackgroundImage set to "zoom". Because of this, the image usually has some grey "letterboxing" showing the panel beneath the BackgroundImage. I want to paint on the Graphics Object of the Panel using its paint event handler. Is there a way to contrain my painting to just the image part of the panel? Is there a way to find the rectangle that the BackgroundImage is occupying within the panel?
P.S. I don't want to make a graphics object from the BackgroundImage because I'm already using that for some other "paint layers".
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Apr 28, 2010
I've never had a need minimize my application until today. But when I did, and I brought it back up, it looked... strange. Which makes me think it has something to do with a paint problem... or something.
Before:
After:
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Apr 29, 2010
I have a datagridview, wich on colum is a Combobox getting data from another table.This column it's an evaluation score mark, who permit user choose between number 1 and 10I wanna do the following:In my DGV, if the value is lower than 5, then paint this cell, and only this cell, redIf the value is uper than 5, than paint this cell green (and only this cell).That means in the DGV I will have at the same time, red and green cells.
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Nov 24, 2010
How do I paint the part pointed to?
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Sep 20, 2009
I am not doing something right! I just changed my program over to painting to a picturebox instead of the form. Anyway I want to be able to print the picturebox as big as it can on a 8.5x11 size piece of paper without streching the image!
First of all I can't even get it to print at any size... it says I have no Picturebox1.image!
Public Sub Picturebox1_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint, PictureBox1.Paint
g = e.Graphics
[Code].....
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Jun 4, 2010
I'm tired of looking at the boring default dark gray back of an MdiParent. I tried using Juggalo's Gradient Form and realized that the MdiParent was not being painted, at all. A temporary work around was to create an Image and set it as the background. This is fine and dandy but when I bring the thing to full screen and drag around my MdiChildren forms, the application gets laggy. I have already tried setting the Form to Double Buffered and it doesn't work at all, no noticeable change.I did try editing the Form's Paint() event, but to no avail.Here's the code I'm using to create the image (practically from Juggalo's Gradient Form):
[code]...
Creates the image nice and fast. I want this to happen in the Form's Paint Event though, so I don't have to rely on an Image that causes my program to lag about.
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May 27, 2012
How to center a cursor at the top of a line in freehand painting. I made a freehand painting program in Visual Basic 2010, I used m_Graphics.FillEllipse(brush1, e.X, e.Y, 40, 40) for painting a broad line. It works.. But.. the cusor is not centered on the front of the broad line. He is at the Left Top of the rectangle that describes the FillEllipse. How can I make the cursor to stay in the middle of the front , while moving around, so that I can more precise paint with him ?
[Code]...
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Dec 7, 2011
I have inherited the standard panel control to create a panel having custom border color. The problem is, while the panel is on a form and any other form is moved across it, it paints hapazard lines of the same color as the panel custom border color, all throughout background of the panel. I tried to Refresh or Invalidate the panel in its paint event but of no avail. The same is happening while designing in the design editor too. See attached image. Why is this happening and how to get rid of it? My code follows:
[Code]...
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Oct 3, 2010
1)How to Paint close,Maximize,Minimize buttons with images
2)How to change height of title bar
3)How to Paint Form border
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May 22, 2012
I have form, on which a component is placed, which is inherited from Forms.UserControl. This component, called Panel, handles the layouting as visible in the screenshot below.
The screenshot shows 10 Panels. Each Panel contains its own title bar and visible area, in which any UI can be displayed.When the application starts, the application contains only one single Panel. When the user decides to split this Panel into 2 Panels, those new Panels are displayed side-by-side in the area of the old Panel either horizontally or vertically. Inbetween these Panels a splitter is added, so that the user can resize the Panels. The user can do the splitting multiple times, so that you reach a layout as given in the screenshot above with 10 Panels.
Minimizing and the maximizing the application causes a painting issue as displayed in the screenshot below. The red rectangle indicates the area, where the layout is not displayed properly.
Here some additional information:
1. Windows 7 The issue occurs only on Windows 7 machines. On Windows XP the application is running properly.
2. .Net Framework The application was developed for the .Net Framework 1.1. I upgraded it to 4.0. All warnings were fixed, which occured after the upgrade to 4.0.
3. Layouting Technically The Panel works internally with mutiple Forms.Panel, 1 Forms.Splitter etc. objects. If the Panel is not splitted, it displays the title bar and a visible area below, both instances of Panel. If splitted, the Panel replaces the title bar and visible area with 2 instances of Panel again but divided by a Splitter.
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Mar 19, 2011
I made a painting on a picturebox in Visual Basic 2010. Now I wish to save that picture on my harddisk. But
pictureBox1.Image.Save("C:MyImage.jpg")
does not work.
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Imaging
Imports System.Text
Public
Class Form
[Code] .....
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Mar 18, 2011
I am working on a spreadsheet-like custom control, manually painting all cells according to its bounds and indexes. All is working fine until I populate it to upto a hundred rows (with fixed 6 columns). Basically my sheet expands itself to fit all cells, so to use it properly on a form, I use a panel with autoscroll = true and with my sheet inside. The problem is, the control flickers a lot, which I think is caused by painting ALL of the cells. Is there a way to paint only the visible area.?? So when I scroll down, the control would paint only the visible cells on that area. What I am thinking right now is to not put it in a container, but rather, put a scrollbar in my control. Then that scrollbar would then handle the setting of visible cells, and then my paint event would only paint that visible cells. I am using VB btw, .NET 3.5.. I cant put the code in here cause its separated in different classes(Cell, CellCollection, Rows, Columns, Range, Worksheet, etc.)
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Feb 9, 2009
Well im just upgrading from VB6 and i was able to paint images to the background of a form. The same method does not seem to work in VB 2008. Is there a way i can draw/paint images to the background of my form?
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Apr 1, 2011
IDE: VB Express 2008Problem: Painting DataGridView Columns.I have done extensive Google searches and found very little on the subject.I have searched this site to no avail.
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Oct 6, 2010
I have started to work some more on my 'shape editor'. If you're not familiar with it,ust imagine the Visual Studio form designer: a 'canvas' (the form) with a bunch of 'shapes' (the controls) that can be selected, moved, resized, etc. I have just finished implementing snapping between shapes and the canvas boundaries. But now I am having some slight issues with painting the snap lines.Just FYI: this is what I mean by snap lines:The blue lines that indicate that the 'buttons' are snapped to each other, and a purple line indicating that button1 is snapped to the boundary.
My shape editor is based loosely on jmcilhinney's 'manipulating GDI+ drawings' codebank entry, and a central idea in that post is to only draw what is necessary. In other words, when I move a shape I could re-draw the entire canvas, but it is much faster and smoother to only re-draw the old and the new location of the shape. Since nothing else has changed, I don't need to draw the rest. So, I simply invalidate the old bounds and the new bounds, and even with a lot of shapes all moving simultaneously it still feels very smooth.
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Dec 21, 2010
I'm looking to draw a trackbar normal, only with a transparent background. I have created a new class that supports transparent backgrounds set to true. Without using userpaint, the trackbar does nothing or takes the color of it's parent. When using userpaint I have to draw the control on mine own. Not quite sure where to start first though...
I've read about drawing a line (not so hard), drawing a floating object (to act as marker), and handling events on when the floating object moves left/right... Drawing 3 separate objects inside an inherited trackbar control seems like a clunky way of calling methods that should exist somewhere? Is there an easier way to draw the control normal without a background? If not, some in starting to implement all 3 new objects working together would be good (I could draw them separately but that's about it).
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Nov 11, 2011
I have created a custom ToolStripProgressBar. It is basically a class inherited from ToolStripStatusLabel, and i paint the 'progress' bar myself (just a simple rectangle). I have tried creating a custom ToolStripProgressBar using different methods including inheriting from both ProgressBar, ToolStripProgressBar and ToolStripControlHost. I always ran into difficulties doing in this way. Inheriting from ToolStripStatusLabel works well, but with one issue...
In order to have the progress bar update in the statusbar, i have to call StatusStrip.Refresh. Trouble is, adds a huge overhead to the drawing of the progress bar graphics. Simply calling the invalidate method of my ToolStripStatusLabel does not seem to render anything to the screen. how to have my graphics draw without calling the refresh method?
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Jan 18, 2010
I have Visual Studio 2008 SP1 installed and lately it is taking longer and longer to bring up a Resource File (.resx) in its standard editor. Some of the file loads up, but you can see that the screen does not paint/render it 100%.I tried doing some searching on the web and the only thing I came across was doing a edit to the GDIProcessHandleQuota registry entry from 10,000 to 20,000. This appeared to work initially, but the problem came back the next day.I am doing an extensive localization project and this is severely limiting the amount of work I get done.
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