I want to make a lotto bulletin and i created the buttons in the program. I have assigned a handler to it and that is working also but how can i change the background of this button later on in the program ?
'/ teken 10 groupboxen
For i = 0 To 1
For y = 0 To 5
[Code]....
I am trying to create a function that will return a pen(System.Drawing.Pen to be exact) that will have a random color and width. I thought that something like this should do the trick:
Public Function random_pen() As Pen
Dim clr As Color = Color.FromArgb(255, random_rgb_color_gen, random_rgb_color_gen, random_rgb_color_gen)
Dim pn As Pen = Pens.PeachPuff 'just a random color else i get a null exception...
pn.Color = clr ' the error is here
[Code].....
However when the code is run i get an Argument Exception with the error message:"System.ArgumentException was unhandled Message="Changes cannot be made to Pen because permissions are not valid.""
I have written some code to generate 10*10 textboxes during run-time.the problem is; I don't know how to access / change them after they are created. after some googling, I found this code to show the text of ie box42;
MessageBox.Show(Me.Controls.Item("box42").Text)
but it gives an error (nullreference exception was unhandled) hereby the code;
For i = 1 To 10
For j = 1 To 10
Dim tb As New TextBox
tb.Name = String.Format("box{0}{0}", i.ToString, j.ToString)
[code]....
how do i change the property of a created object in the timer event? In other words i have a button that creates a panel for me, in a time event i want to change the created panels to a different backcolor, how would i do this?
View 1 RepliesI have a sub that handles when 14 ComboBoxes have their Index changed. I am able to cast the sender of the event, and obtain properties from there. However, after that, I want to be able to change the properties of the actual sender, rather than the cast one.[code]...
View 5 RepliesIf you want a instance of an object to be created when a form loads or another class is created, you have two options:
Public class example
private IAmAObject As IAmAObject
public sub new()
[CODE]...
Or like this:
public class example
private IAmAObject as new IAmAObject
public sub new()
[CODE]...
I always use the first one. It's more type work but I think it's neater. How about you people and is there any real difference between the two?
How to change all properties of a form to properties of other but don't change important properties like Owner,Handle, OwnedForms, Parent,HasChildren,Controls and ... .I have a child form that i want it to provide controls of Form.The background form provides Aero frame and child form is a transparent form in it.I want it because I want to draw buttons with system style in Aero in Windows Forms.This is my own code but it does not work good (ForeForm is child form):
For Each Propertry In ForeForm.GetType.GetProperties()
Select Case Propertry.Name
Case "AeroBackgroundEnabled", "FormBorderStyle", "TransparencyKey", "Parent", "Owner", "ShowInTaskbar", "Handle", "HasChildren", "OwnedFo[code].....
Additionaly:I wrote a great Aero Form.I don't publish current version (1.2) that supports Aero Blur,RealTime Aero Color change,extend Basic theme?
I am somewhat new to object oriented programming and am attempting to flatten a Linq object hierarchy by using a shim class.how to initalize a derived class with property values from a base class?I have two objects, a base object with about 100 properties, and a derived object which inherits from the base object and adds a few additional properties beyond those of the base object. My simple constructor creates the derived object, but I am looking for a way to initialize the derived object properties with values from the base object.Right now I am using reflection to iterate over the properties individually and I suspect there may be a better way. The following example shows my shim class constructor for the derived class, and two properties:
newProperty1 - a new string property of the derived class
flattenedProperty2 - a new string property of the derived class, copied from a 2nd-level object of the base class
Code example:
Public Class derivedObj
Inherits baseObj
Private _newProperty1 As String[code].......
Is this the correct constructor approach to flatten the object hierarchy using a shim class? My second question relates to initialization of properties in the derived class. The constructor above creates the derived object, but what is the best way to initialize the derived object properties with values from the base object? The following code uses reflection to iterate over the properties individually, but I suspect there may be a better way.
Code example:
' property names are in the string array fieldNames
'baseObjQuery is an ienumerable of baseObj
'derivedObjList is a list of derivedObj[code].....
Is there a simple way to initialize values for the properties in the derived object based upon the values of the common properties in the base object?
[code]I want to make the Properties Window to update the properties for X and Y at each MouseMove, so they become immediately visible for the user.
View 2 RepliesI hope the question makes sense, anyways. I'm looking to know if in VB.NET, when we call an object's constructor, is there some kind of a reference that points back to the caller? I'm interested because of a corner case where I want the object being created to first be able to validate the existence of some data in the caller before it allows itself to be created. If this validation fails, I plan on throwing an exception. This corner case will never happen at runtime unless the object being created is used improperly by a programmer. The object being created is not inheriting the object I want it to validate, so I can't do anything with the MyBase qualifier.
It's bit of a "future-proofing" issue that I have a (bad) habit of doing. Not critical -- I can always leave stern comments behind as a last resort. Wanted to know if this was possible.
I want to build a MVC helper function for which I pass a Entity Framework object and have it build a select. Generally speaking I tried something like this:
Public Function RenderSelect(ByVal helper As HtmlHelper, ByVal sSelectName As String, ByVal aItmes As Array, Optional ByVal sTitleKeyName As String = "name", Optional ByVal sValueKeyName As String = "id") As String
' open select
[Code].....
However, it isn't working. It would be great to have a way to do this and pass the current entity object.
Dynamic Object Properties in a MVC Helper on a Entity Framework object
View 1 Repliesi been trying to figure out how to get the control name and other properties of a dynamically created control. I have actually dynamically created a label andnamed it. how do i retrieve its name and other properties.?
View 3 RepliesI'd like to have something like:
[Code]...
how to change the properties of control which are created at run time. The actual situation goes like this: I will be creating 4 picture boxes at runtime and assigning pictures to them. Now if i wanted to change those pictures, i am not getting how to call those picture boxes.
View 6 RepliesI had created another thread asking how to create OvalShapes during runtime... Ok, so I have that covered, but what I need to know how to add properties to these OvalShapes individually. The OvalShapes are stored in the List(Of OvalShapes) if I create a loop from 0 to the length of the list it modifies all the OvalShapes with the same propertiesWhat I�m trying to do is make like 5-10 balls collide, this is why I need these properties to be individual to each OvalShape.
View 2 RepliesAfter taking a few years off from programming, I decided to start learning vb.net. I have created a user control that contains a picture box. I added some custom properties to the picture box that will hold general string data from a database.
My problem is that the user control is programatically created during run time, and during this time a DoubleClick event handler is added for the picture box that is within the user control.
I need to be able to set the custom properties for the picture box during the creation of the user control, so that when the control (picture box) is double clicked I can read these values but am unsure on how to access them.
The picture box is the entire size of the user control, or I would just add the custom properties right to the user control and add the DoubleClick event handler to that. However, double clicking needs to be done on the picture box since it takes up the entire user control, unless anyone has an idea to trigger the DoubleClick event of the user control when the picture box is double clicked.
[Code]...
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.
I am working on a TCG card game and I am having some trouble of thinking how to find the Properties of a Picturebox that was created at RunTime through a Click Event.
Here is the Code I have This is the Sub that I have to create the Pictureboxes...
Code:
Private Sub CreatePictureBox(ByVal name As String, ByVal x As Integer, ByVal y As Integer, ByVal height As Integer, ByVal width As Integer, ByVal picture As String)
Dim PB As New PictureBox
[Code]......
I am looking for the best way to have a kind of runtime dynamical references. I will try to explain the purpose with an simple example.
Lets imagine we have a structure holding a persons data like this
Public Structure Person
Public FirstName As String
Public LastName As String
[code]....
A list of Persons is contained in a List Of Person. On a form we have a textbox showing the (First and Last) Name and a textbox showing ONE phone Number. With a selection we can choose what phone number to show. The selection gives the selections "Home", "Work" and "Mobile". we can scroll through the list of persons with a kind of scrolling mechanism (not important in this case)
For the textbox showing the choosen phone number we DO NOT want to use a CASE statement (it would be possible in this example, but with the real project this results in a runtime changing case).
So we want to use something like this:
textboxPhoneNumber.Text = SelectedPerson.xxxPhone
Where xxx can be home, work or mobile, resulting in the right reference to the structures choosen element (HomePhone, worhPhone amd MobilePhone).
Is there a way to achieve this in VB 2010?
i have a project to generate code for TabControl.I'm doing 1 form whit textbox-es to enter the tabcontrol properties (name, size, pozition) For the number of the tab pages in the control i'm generating dynamicly another tab control with the number of tab pages entered in the tab control tab pages field [code] this is the part of the code, i have more fields.What i'm trying to do is when i enter the tab name in theTextBox_tp_name field in the generated dynamicly tab pages, the tab_pages.Text have to change when i enter a new name in the theTextBox_tp_name.
View 12 RepliesI want to generate a dynamical graph or bar chart X vs Y . Please send me a example I can manage the rest
View 2 Replies1. if i have ten images in my database, i want my windows app. form to load all these images at once but into ten different picture boxes which i will draw.
i want to do this by getting the count of images and start drawing and populating the images after each drawing. in future if i have only 4 images in the database... i draw 4 picture boxes on a windows form
I created an Access Object in vb.net:Dim acApp As Object = CreateObject("Access.Application.11")en I open Access I need to pass a parameter to it though "/cmd".I read that the only way to accomplish this is through a shell - that it is not possible directly using an Access object.
View 5 RepliesI need to call this function saveBase from more than one place so i decided to send a number in variable x to know of what type to create the object named Model. however when it's within the if statemet i keep getting the error that model is not declared ![code]...
View 6 RepliesI have a dll that create container object. How can dll inform a form that the container (me) has been created. Is it possible in new sub of that class?
View 13 RepliesIf I declare my object at the beggining of my page class, and instantiate it in a dropdownlist selected_index change event. Shouldn't this object be available thru out the entire page and also persist thru a postback? I lose the object in my selected date change event in my calendar.
[Code]...
I am trying to figure out how to add my own properties to an object. i am trying to make my own rpg game and i want to be able to refer to a integer property like so: strengthstat = bronzelongsword.attackstrength. of course strength stat being an integer vairable that would equal to the property attackstrength that belongs to the bronze longsword.
View 14 RepliesI'm adding some functionality to an app that was made a few years ago and I need to raise an event when the tabcontrol is clicked. However it would seem because the control was created publicy I can't add a handler to it? I never ran across this before. I stripped the code down to the bare essentials. As you can see in the image, if I Dim the control within the sub I can add the handler. But any handler created for the publicly created control fails.
Is there another way to create the hander in this case?
My
Public Class Form1
Dim x As Integer = 0
[Code]....
As you can see, i can retrieve the tag of the button (which is created at runtime) without any problems, i've made a temporary msgbox to show me the value of the tag, just for testing purposes. What i do have a problem with, is retrieving the tag of the individual web browsers, how should i do this?
Next issue, how would i code for my buttons to show the web browser with the same tag as the button that's just been clicked?