TransparacyKey Property Makes Form Draw Slowly?
Aug 17, 2004
I've been developing a progam at work and for some reason I set the TransparencyKey of my main form to a color rather than transparent.I left it and didn't even think about it until I noticed that the form had a delay when redrawing. All the controls are black boxes for a split second. See attachment.
I never noticed it before but the computers we use here at work aren't made for graphics. They've got various GHz speed celerons and integrated video cards.
I don't need the TransparencyKey in this program so it's not really an issue for me. I was just wondering if anyone knew why it's redrawing so slowly. What is .NET doing when drawing the form?
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Dec 17, 2009
I have a form with about 50 controls on it. labels, check boxes, combo boxes. text boxes and so on. Now I have a image on the back ground of the form and have made the checkbox text with transparent back ground so the picture can show through. the problem is that it is so slow to load. I see each one appearing on the form one by one. I have tried this on multiple machines and it does it on all of them. I have tried making the checkboxes not transparent but it still is slow.
how can I allow the form to load completely before it displays it. This is the initial form that loads and shows up.
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Aug 7, 2009
I'm having an interesting issue that I can't reproduce on a different project, but can consistently on this one. I have no clue what might be causing it, but am hoping that someone may have seen it before.
I have a main form, from which I run a series of checks. On this form, I have a listview control. Because of some issues with the refreshing of this listview control, I had to create my own messagebox. It's just a form that displays some text ( it also happens to look nicer than MsgBox; in my opinion, anyways ). It's been working great for months, until recently.
My problem is that on my main form's load event, I run this check, which returns an error within a try/catch block. I then call my custom messagebox with a message. It in turns calls it's ShowDialog() function.
In any other situation ( after the main form has been loaded ), I have no problems. The messagebox goes on the screen and behaves appropriately ( ie: waits for my input and acts as a modal dialog ( stops execution of my main form's thread ) ). However, on this onload event, my messagebox comes up and goes away almost immediately afterwards.
I've traced it all the way to the showdialog() call. For no explicable reason, it appears to skip right over this call, without me doing anything on the form.
Here's what the inner trace looks like ( when I put a breakpoint on the onclosing event for this messagebox form ):
CODE:
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Oct 27, 2011
some controls(e.g. buttons/labels) dont have a drawmode property. Im looking to create buttons with rounded corners because they just look nicer :P. Now, the problem is that even when you have a custom paint event, the button just gets drawn first and the custom paint event will draw on top. Especially with rounded corners, where you see the parts of the default button in the corners. Is there a way to only execute the custom paint event / block the default paint?
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Jun 13, 2010
I'm trying to add a feature to my program that makes it so when the cursor moves off of the form, the form drops in opacity, making it sort-of transparent. However, it's not working for some reason.
Private Sub hovertimer_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles hovertimer.Tick
If MousePosition.X < "0" Then Me.Opacity = 60%
[code].....
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Feb 24, 2011
am developing a basic "stock tracking system" in VB.Net with an Access Database for my final year project, and I am in need of help with some issues that I am still facing.System:The user basically selects a customer, selects the product, batch number, quantity, and date that the customer has chosen, and gives a summary of the transaction.I am then generating a summary report via the report wizard tool to show stock levels, and info on which customers bought what product.My Database contains 3 tables: Customer, Product, TransactionI can currently write to both the customer and product tables, bit i havnt figured out how to save a transaction record yet?, also, I am saving to the product table from a "Deliveries Form" that I have for entering incoming products. But I have not yet figureed out how to subtract the quantity values in the product table from the "Purchasing Form"? This is a major issue)en the user selects a customer from the dropdown box, that customers details is displayed in a label on the next form for the users benefit. This works when I hard-code the customer ID to be 2 for example, but it doesnt seem to recognise the "gCustomerID" (I have gCustomerID declared Global Variables module file)I think that this is the problem?
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Jul 26, 2011
in the richtextbox(from my class) gotfocus -what I need is the richtextbox.text to also be in a different textbox on the form. the richtextbox(readonly) is from my class that has mousedown and mouseup code and more than one richtextbox (small in size) will be on the form in a container so when user clicks on one I need the richtextbox.text to also be in a regular textbox (not from my class) and not located in container. And I need to read a property I made in my richtextbox class.
[Code]...
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Mar 31, 2010
I am not sure whether this is a trick question?One of the object i have has 2 boolean properties, Standing and Sitting.I have a class called student with the 2 methods stated below- Am I coorrect is assuming that the first method draw() is affected by the standing property AND not the second method?Also the way it affects is that it draws an image when the the stugent is standing?
[code]...
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Dec 25, 2009
I've create my program before in Windowx XP ir required 1:37 seconds to finish the Genetic Algorithm but after I moved to Windows 7 64 bit and trying to used the 64 bits compiled version it runs much more slowly, it could take 5 minutes more, I've tried to change to 32 bit compiled version it run more faster than 64 bits but still slower than Windows XP it takes about 2:01. Is there something I missed in the compiling for 64 bits, or maybe the VS 2008 still not compatible with Windows 7.
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Dec 16, 2010
what i want to do is have a richtextbox lets say this is the text
1
2
3
4
[Code].....
and i what i want to do is have a timer and have it scroll down line by line so each letter gets show and some letters go off the richtextbox cuz its small
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Apr 25, 2009
I'm trying to query a remote machine and get the cpu percentage similar to task manager.. I have the following code:
Code:
im wmiK As New WMI
Private objMgmt As ManagementObject
[code].....
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Jul 1, 2010
So in this program that I've made, I have 5 tabs. One of them uses this chart control for .NET ver 3.5 that I downloaded from the Microsoft website. The issue is, though, that when I start the program, everything is fine until I click on the tab with the 3 charts on it. The tab freezes a little bit, and it takes a few seconds to load the charts. After this initial hiccup everything is fine, but I've tested this on three computers now and it happens to all of them. Anyone know what I can do to make these charts load faster or smoother? This is quite a roadblock.because otherwise I'd be done I've been working on this project in VB.NET for the past 3 weeks and it's my first time using the language. So far every single one of my questions on here has been answered and all within a day or two
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Dec 17, 2009
I am working with serial port communications. I have very fast and continuous data on my serial port. I have a program to read data from serial port. I have comport.Datareceived event in my program to receive data. Now, the problem is there is data going every 100ms to comport. Will my comport.DataReceived event will receive also with that fast? Now,let's say there is data on comport and if I don't read it what happens to the data? The problem I'm facing is my dataReceived event is getting very slow after some time.If I stop sending data to my com, still my datareceiving program is receiving. That means it is not as fast as sending data.If I keep sending data from 4 to 5 days and coz my datareceived event is not that fast as sending, I am getting data very slowly and some times I am getting MemoryOutofRange Exception.
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Sep 12, 2011
just wondering if its possible to fade out a picturebox slowly after it has been clicked?
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Jun 11, 2010
Background :While running benchmark tests this morning, my colleagues and I discovered some strange things concerning performance of C# code vs. VB.NET code.We started out comparing C# vs. Delphi Prism calculating prime numbers, and found that Prism was about 30% faster. I figured CodeGear optimized code more when generating IL (the exe was about twice as big as C#'s and had all sorts of different IL in it.)
I decided to write a test in VB.NET as well, assuming that Microsoft's compilers would end up writing essentially the same IL for each language. However, the result there was more shocking: the code ran more than three times slower on C# than VB with the same operation! The generated IL was different, but not extremely so, and I'm not good enough at reading it to understand the differences.
Benchmarks I've included the code for each below. On my machine, VB finds 348513 primes in about 6.36 seconds. C# finds the same number of primes in 21.76 seconds.
Computer Specs and Notes
Intel Core 2 Quad 6600 @ 2.4Ghz
Every machine I've tested on there is a noticeable difference in the benchmark results between C# and VB.NET.Both of the console applications were compiled in Release mode, but otherwise no project settings were changed from the defaults generated by Visual Studio 2008.
VB.NET code
Imports System.Diagnostics
Module Module1
Private temp As List(Of Int32)
Private sw As Stopwatch
[code]....
Why is C#'s execution of Math.Sqrt() slower than VB.NET?
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Jan 18, 2009
i have a .txt file containing 27,607 words, 1 per line, and i need my program to slowly read through and put it into a textbox/label. It only needs to read in order, not randomly or anything. It needs 2 be slow enough that I can read every word being shown, and if possible it would be nice to be able to change the speed but it is not needed.
Public Class Form1
Dim FILE_NAME As String = "C:My DocumentsWordList.txt"
Dim objReader As New System.IO.StreamReader(FILE_NAME)
[code]....
This is what i tried and all this does is displays 2 words in the middle of the file, then form goes white for about 5 seconds and then the last word in the file shows up and the program remains white. When i try with a txtbox only the last word is displayed.
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Nov 11, 2011
I'm trying to draw a 400x400 px image to a 400x400 form that I made. What I'm doing is:
Graphics.DrawImage Method (Image, 0, 0, 400, 400) 0, 0, 400, 400, ...
But when I run the form, the image seems to stretch slightly upon the y-axis, the x-axis seems to be working correctly.
This was what I was doing before (stretching the old smaller images to fit the size)
... (Image, 0, 0, 264, 231) 0, 0, 400, 400, ...
or something like that. Now that I'm trying to do it the correct way, I can't seem to get it to work properly.
Edit: I wonder if using a simpler verson of Graphics.DrawImage would work?
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Feb 14, 2011
I have an "application" that consists of a form Form1, with the following code behind it:
Public Class Form1
Dim xDown As Integer, yDown As Integer
Dim g As Graphics = Me.CreateGraphics
Dim p As Pen = New Pen(Color.Black, 1)
Dim r As New Rectangle
[Code]...
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Jun 21, 2010
How can I do the same thing with other shaped like rectangle?
I know that I need x,y,widht,height but it still don't do my rec.
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Jul 16, 2009
in vb.net i would like to draw a regular line on a form. is there a control to do this?
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Oct 28, 2009
Can i draw a image outside my form?
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Oct 10, 2010
I want to move cursor with visual basic and it seems I found way how to do that. It is possible even click with Visual Basic whereever on screen. But I cannot check out where on the screen the click was done and so I want to draw two short crossing lines on that point as marker where Visual Basic clicked on screen. If it is possible to move cursor to that position and show it then it is as good as drawing marker.
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Dec 4, 2009
Can I draw my own shapes (such as a filled circle, square, etc.) on a form?Can it be done from code as well as from the designer?Can I use events such as onClick() on the shapes?
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Jun 6, 2011
Draw rectangle outside of form?[url]...
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Oct 21, 2010
I would like to draw a rectangular outside the form using mouse position but so far, I only found out how to draw rectangular inside the form.
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May 1, 2012
I want to draw a histogram when Form2 is loaded, I load Form2 using button of Form1 It didnt work, Form2 is loaded, but no image...i dont know why here's the code
Private Sub Form2_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
Dim img As Graphics = PictureBox1.CreateGraphics
[Code]....
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Dec 7, 2010
On Form1 we have: TextBox1 TreeView1 - holds list of customers, is located near the bottom of the form, not visible from the start. Now, when I start typing text in TextBox1 (i need to filter customers), TreeView1 appears and suggest for example 30 customers matching the searched text. I want the program to show the treeview and draw it also outside of the Form1 boundaries.
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Jun 18, 2012
I am basically teaching my students about OO programming and want them to be able to see the outcomes to methods visually. I want to draw shapes on a form but cant for the life of me get it to work - no errors but no actual shapes are being drawn. So I have created a method called drawFace which is run when a new instance of the object is created. This method has the following code in it
Form1.CreateGraphics.DrawEllipse(Pens.Black, 100, 100, 100, 50)
It doesn't cause any errors, but it doesn't seem to do anything. Also tried adding a picture box to the stage and ammending the code as such
Form1.PictureBox1.CreateGraphics.DrawEllipse(Pens.Black, 100, 100, 100, 50)
But still no joy.
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Apr 30, 2012
I have a website(asp.net) which displays ssrs reports. Howevery everytime that I try to run the report from the website it takes about 2 min to load, but if I click on the report again , it will load up in seconds. I have tried to run a query that is used by the report and I get the results in second as well.
Is there any configuaration that I need to change or any tsql code that I need to add?
I have gone through to solutions provided here on stackoverflow but still had no luck.
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Jun 29, 2011
I created a program that has 11 threads running simultaneously.Each thread runs a stopwatch and measures the amount of time that passes between the Start and Stop.There is no code between the start and stop, so most often, the result is 0 milliseconds.I noticed that INITIALLY, after a few minutes, the program would slow and the output to the RichTextBox would become disjointed.So, every two minutes, I have a timer execute and end the threads and restart them all.This seemed to help, however, after about an hour and a half, the program becomes more sluggish, evident in the stopwatches recording more instances over 0 milliseconds.Does this have to do with 'garbage collection' and is that even possible in VB .NET (I thought C only had that), or perhaps memory management?
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