Dynamically Changing The Image Of A DataGridViewImageCell Isn't Working On Form Load
Sep 27, 2007
I have a DataGridViewImageColumn that should display an image for only certain rows. After I bind a generic list of classes to my datagrid, I loop through each row and update the image cell with an image that is an embedded resource for the rows that require the image. This works great if the form has been fully loaded. However, when I attempt this on form load the image doesn't show up? I also can't perform simpler things such as changing the row background color on form load. Should I be performing this logic in a different event after form load?
For i As Integer = 0 To dgvRoles.Rows.Count - 1
Dim imageStream As System.IO.Stream = Nothing
imageStream = Me.GetType().Assembly.GetManifestResourceStream("MyApplication.Timer.png")
[Code]....
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Jul 31, 2009
How to load a picture to the form dynamically? also how to load a picture to the picturebox dynamically?
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Sep 13, 2009
I have this code which run at form load event:
' Fuente
Dim tamano As Integer = Val(INI_Read(Application.StartupPath + "FSTM.ini", "Options", "Font size"))
[code].....
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Apr 26, 2011
I dynamically load a user control in a form (Form 1).
In my user control there are two things :
a Textbox (TxtBox1) and a Command Button
WHen the button is clicked, it opens a new form (Form 2) Form2.ShowDialog()
My question is, in Form 2, how can i set a value to TxtBox1 of the user control?
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Jun 4, 2011
Well i just tried to turn Rows cells that contain the word Yes into green on form load when i put that code into a button it worked but on a form load i didn't work !
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim j As Integer = 0
[Code]......
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Apr 24, 2011
is there a way to change the background image of a form by just shaking the form? i'm using vb 2010.
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Sep 23, 2009
I am working a building a form that is generated using Project|Add Windows Form|Form.
In the Load procedure, I placed the following code:
dbObject.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=c:scdbv4datascdbdata.mdb"
rsObject.CursorType = ADODB.CursorTypeEnum.adOpenKeyset
[Code]......
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Apr 26, 2009
i would like to add a image from a website to my form directly on load. should be something simple..
also to be able to change images all over the form with images from a website..
don't laugh, i tried this:
Public
Class
Form1
[Code]....
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Apr 8, 2012
Dim LabelArray(12) As Integer
LabelArray(0) = Label3.BackColor = Color.White
LabelArray(1) = Label4.BackColor = Color.White
[CODE]..................
i have made an array. first of all i want to make it global and on form load i wanna show it's first position and on a button' s click i want to increase it's position by one how can i do that
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Jul 14, 2010
I have an application that connect to a database... and this process take a few minutes... and need to show an animated image or a message like "loading...." while the mainform is loading and connecting to the database?
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Jan 14, 2010
I have an application that connect to a database... and this process take a few minutes... and need to show an animated image or a message like "loading...." while the mainform is loading and connecting to the database
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Jan 8, 2012
My client wanted to have a textbox in the Customer form of the application, which offers the applicable endings to a started street name. He starts to type a street name and the textbox offers a list of streets which start with the char sequence he typed into the textbox. Textboxes have the AutoCompleteCustomSource property and even though a list of common street names will be longer than it could be pre-filled on start, I could just hit a database with a query, populate an AutoCompleteStringCollection and show that to the user.
Now here's the thing: If I make the list populate on every keypress/keydown whatever, the program crashes and throws an AccessViolationException. I've found out that that's because: The control is in the middle of showing the AutoComplete list when at the same time it is being modified, resulting in the crash. When you refresh the Autocomplete List, the control is recreated with new pointers. Keyboard and mouse events (KeyPress, MouseOver, MouseLeave, MouseHover) attempt to reference the old control's pointers which are now invalid in memory causing a memory access violation to occur.
The underlying AutoComplete implementation does not allow for changing the AutoComplete candidate list object once it has been set on a window. To allow changing the list, WinForms destroys the Edit control or ComboBox and recreates it. This causes an exception if the underlying control is destroyed while the AutoComplete window is still use it. I read about this on MSDN, their resolution: Do not modify the AutoComplete candidate list dynamically during key events. I know that you can do this by creating a custom control and such, but can it be done with just pure coding wizardry?
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Feb 1, 2012
I have VB.NET code that is called when the selected tab index of a tab control changes, I am trying to get the code to change the text in a text box to the URL of the web browser control that when the tab changes. I have the code below, however it gives errors:
AddressTextBox.Text = CType(TabControl.SelectedTab.Controls.Item(0), WebBrowser).Url.ToString
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May 10, 2010
I have a ContextMenuStrip attached to a TextBox
Dim TelTBMenu As New ContextMenuStrip
With TelTBMenu
.Name = "TelTBMenu"
[Code]....
Whilst the form is loaded this runs fine twice, but then although the Setting boolean is reset the ToolStripItem text remains unchanged unless the form is re-loaded.
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Aug 15, 2011
we're working on a billing systemCurrently I am working on the categories module. Here's the thing:I need a dynamically changing UI. So the user can add categories, delete them and teh UI would accordingly add or remove controls automatically.I used DataGridView, but since the fetching and storing of data will not be done in a database, I need to fetch it and update it using an HTTP API, the data bindings are causing problems as I need to update, Insert or delete data using functions instead of letting VB do the hard work. I tried creating a datatable and checking for changes everytime user added/deleted/changed a row, but again the problem is: in a datatable I am not able select what type of control represents the column. For Example I have a parent category column where the control needs to be a combo box. The datatable's columns don't seem to provide an option and are automatically set to text box.I am thinking there is a really cool way of doing this that I am unaware of. all the VB.NET books I have read only seem to use DataGridView in conjunction with some sort of a database and not independantly.
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Mar 7, 2011
How to set up a Chart using the new MS Chart control. I want to be able to populate the data via SQL because the user will be able to dynamically change the values via drop downs. The format of the data will be the same (Qty, Time Period) but the Focus of that data will change. I'm honestly not sure where to start, I can draw the chart but I have no idea how to populate it with data via code so it can be changed dynamically.
VBE 2010, and I'm hitting an AccessDB
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Jun 20, 2010
I'm making a button that will create a textbox, and label dynamically.
I have it creating both, but when I try to set a font on the label, it disappears.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
NumBox = NumBox + 1
[Code]....
When I remove the line that sets the label's font, it shows up, but in the default font.
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May 15, 2009
I have made a program wherein you the labels are dynamically created with a press of a button. if you press on the label, the label would then change color from white to blue. my problem is that how will you make the backcolor of the label change when the button3 is pressed.
here are the codes. placed the whole thing since I dunno if you guys would understand what I mean.
[code]...
PS here is the link to what my program looks like. link to my program . the button3 in the image is Reserve Seat.
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Oct 25, 2010
I have the following table row on my .aspx page.
Initial Requirements:
<ItemTemplate>
<td valign="bottom" id="ReqStatus" runat="server" style="background-color: Gray">
<%#ReqStatus(CType(CType(Container.DataItem, System.Data.DataRowView).Row, DataSet1.DataTable1Row))%>
[Code]....
I can change the color of the return value based on conditional statements but cannot figure out the correct syntax to change the table cell back ground. My attempt is commented out.
How do I correctly declare the table cell? Findcontrol must not be the correct way.
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Mar 1, 2010
I am trying to write some code that will allow me to dynamically load DLLs into my application, depending on an application setting. The idea is that the database to be accessed is set in the application settings and then this loads the appropriate DLL and assigns it to an instance of an interface for my application to access.
This is my code at the moment:
Dim SQLDataSource As ICRDataLayer
Dim ass As Assembly = Assembly. _
LoadFrom("M:MyProgsWebServiceDynamicAssemblyLoadingSQLServerinDebugSQLServer.dll")
[code]....
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Jun 2, 2011
I have a GUI that is processing data from our shop floor.In order to communicate with external programs, we are using MSMQ to process messages. Each interface we have to an external program, we are currently creating a class file with only properties,calling the class in the GUI, setting the properties, then sending the class object to MSMQ for processing.The class is serialized as an XML file, and the queue watcher can pick up the class, deserialize it process the messages without any problem.Currently we have identified three interfaces, developed the classes for them and this is working great.As more interfaces are identified moving forward, I would like to avoid having to add the classes to the GUI front end for each interface.I would like to create a DLL for each interface (again only with properties) that could be dynamically loaded and discover the properties for the class.The GUI could then set the properties for the class and process the message.One property each class will have is the name of the interface.This will be a readonly property that will the queue watcher know which interface to use. In order to make this dynamic, I could create some tables in our database that would contain the name of the interface and cross reference the properties in the DLL with parameters in the GUI. This way the GUI would only call one DLL that would be embedded in the GUI, it would call the database to get the parameters needed for the interface, match them from the GUI and create the message.
1.What is the best way to dynamically load DLL's using VB 2008?
2.Does this sound like a good proposal?
3.My intent is to have the GUI re-compiled as little as possible to minimize the impact on the shop floor when new interfaces are created.
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Jan 13, 2010
i m trying to load the tabs dynamically.(Using AjaxToolKit). Firstly, when i hit button1 on pageload, it loads tab1() (works good) and when i hit button2, itloads up tab2() All these tabs are ascx pages. In tab1 i m loading WebUserControl.ascx. it works okay.
Issues:
1) When you runthe code, first click on button2, it doesn't load tab2 dynamicaly but it does when u hit button1 for the first time.
2) Repetitive clicking on button1 or button2 should load the same tabs next to eachother again and again but it doesn't
3) Thirdly, the main issue is that I m tryin to load another .ascx on loadtab2() which should have webparts in it. I should be able to load an another custom usercontrol into these web parts dynamically. But i m not able to do so.
Here is my code:
Default.aspx
<p>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</p>
[code]....
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Mar 27, 2009
[Code]....
This is in a button click event, and when I click the button, the DllMax.DllMax form should be shown.[Problem]The DllMax.DllMax form is shown well, and after I close it, I found the CPU is from 0% to 20%.Don't quit the application, add Click button1 again, and close the form, the is from 20% to 40%.The CPU persentage is NOT added when the form is opened(I checked it carefully), but added just when the form is closed, and it will keep to 40%.I don't know what the CPU is doing? I want to know:1. Is there a method to find out what exactlly CPU is doing in my application?2. Why the CPU from 0% to 40% when I close the form?3. Why the CPU keep to 40% even I did the FormToShow.Dispose()?
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Sep 13, 2011
there are two forms, form1 and form2. form1 has textboxes 10, the user can enter data in a specific number of textboxes: ie: 5 or 3, or etc.
then the user clicks a button, and based on the number of textboxes that he entered data on, form2 will load a number of texboxes: If the user filled 3 textboxes in form1, form2 will show 3 textboxes.
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Jul 27, 2009
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
Dim con As OleDbConnection
Dim cmd As OleDbCommand
[CODE]...............
The insertion part of the form works great. But my problem is in the form load part......If i leave a field blank(Null),then perform Save operation,close the form after successful insertion and then reopen the form,then it retains the previous values during the form load......This is only in case where i leave a field blank in the previous data entry in the database.......But if i enter values in all fields then form load is working great.
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Jun 16, 2011
I need a code that will load text, the correct image to match it and the command for each image. what i want to do is make a program that will download a swf and an image into to folders. then at startup the program will load all the swf and images and put the images into a listview so when you click on the image for the swf file it will give the link to the swf so it can be loaded.
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Dec 22, 2009
I am "weeks new" to visual basic 2008 but I was hoping that someone might tell me how I can open an image in whatever type of "visible" graphics window (always positioned at: x=0 y=0); move to some "definable position" of interest x=(n) y=(n); change the brightness of that "individual pixel" by some "definable means of measure" from its original state; and save the new image as a separate image file?
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May 26, 2011
I am attempting to dynamically create a profile page. Everything works fine except when I try to add the title (surrounded by <h2> tags) to the lbl control which is inserted in the select statement. Let me know if this is too confusing and I will attempt to explain further.
[Code]...
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Dec 20, 2009
i want to know, which way program runs faster1- add image to button through its property -> assign image from project resource file2- on form load event, assign images to buttons, from project resource file
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Oct 19, 2011
I've been experimenting with Windows 8 and Metro UI, I've written a perfectly reasonable load of a bitmap image, but it doesn't seem to be loading,
Public Sub New(Image As String)
Debug.Print("ms-resource://MyAssembly/" & Image)
Img = New ImageBrush()
[code].....
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