I am working with a list of points. It is declared as a global in my form.[code]the only issue is that instead of New Point(100,100) i need to be able to navigate to the previous 4 records in the list. pull out the 4 x vals the 4 y vals and boom there you go. In the old days id make a simple loop and get r done but im not sure the syntax to step through the list that way.
View 8 Replies
I've gotten a listbox control to populate with a list of installed fonts, but I need to be able to click a button and remove the selected item from the listbox. How do I do this? Every time I try, an exception is thrown.
Here is the code:
Public Class Form1
Dim fonts as New Drawing.Text.InstalledFontCollection
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code]....
I need to determine the ranking of the List items specified by one specific property of the items.
I have the following Class:
Public Class LevelA
Property items as New List(Of LevelB)
Public Class LevelB
Property factor as Double
ReadOnly Property rank as Integer
End Class
End Class
For example, let's say I have three items in the List. I have set the factor property for the first item as 5.50, the second item as 6.60 and the third item as 3.30.Now I should be able to get the rank property of each item (the highest value should be ranked as 1). Here the first item in the list should have the rank as 2, the second item as 1 and the third item as 3.
What kind of procedure is needed for the "ReadOnly Property rank as Integer" for returning such values? It should somehow be able to access the list in the parent class probably?
By the EnumChildWindows API I can know the Hwnd of the ListBox control of an external application. By the Hwnd I can too to select "generically" the control by a PostMessage API, also if the application is not the foreground window.
Now the question is: is there way, in your opinion, to select a specific item of this external list box, also when the application is not the foreground window?
I have a list of "ObjDay" which could have replicated items. How can I select them?
ObjDay is:
Public class ObjDay
_date
...
End Class
[Code].....
I'm having a problem recently, a logical issue so hard to determine various examples.I need the text that is inserted in textbox, which has been altered or modified or twisted to have a proper format through line accordance and constant white spaces etc. And some cases I stuck at defining the If statement within the loop. Here's an example of a text I'm trying to reformat.[code]I'm using Microsoft Visual Studio 2010 Ultimate version with Microsoft SQL Server Management Studio. This code is being fired on mouse click event of a button control. This is a snippet of my code there are more filtering after but here is what should be changed.
View 11 RepliesI am a beginer in vb.net. For a school project, i have chosen inventory control as the subject. WIth help from videos, i have developed some basic forms with adding/updating.
The product table design is like this:
Name
Type
Size
[Code]...
Now, i am designing the purchase/sales screens. I am showing the items name, qty, price in a datagrid. From the products table, I am able to select the 'ProductName' by giving it a combobox . I want the ProductSellingPrice also to appear in the next column of the grid.
So im trying to get evything that has ends with .iso into a list box, tryed a couple of things but not getting anywhere as yeat
Here is code.
Dim Locate As String = Application.StartupPath & "\Games\"
ListBox1.Items.Add(Locate.EndsWith("*.iso"))
The Locate String is there because thats the location where the iso files are but the application is in the root of the drive. The ListBox1 command is fairly easy to understand
I'm looping all the properties in an object via reflection:
For Each p As PropertyInfo In values.[GetType]().GetProperties()
If p.CanRead Then
'Do stuff
End If
Next
how to determine whether the property in question is a generic List(Of T)? If it is I need to loop the list itself.
I've experimented with GetType and TypeOf but have not managed to get anything working.
To clarify, I want to keep this generic. I do not want to specify the type of T, I need to loop the list items and call the ToString method on each item. T could be one of a number of different types (application specific reference types). Is it possible to do this without specifying types?
(VB.NET 2005 with .Net 2.0)
This program is supposed to allow the user to check items in a checked list box. If the item is checked, it goes into the Completed List Box on the right. The program then adds the unchecked items to the Pending list box on the left. I keep getting placement values (e.g. O,1,2) instead of the strings (e.g. "Key Returned") in the list box results (see photo attached)
Public Class frmCheckOut
Dim i As Integer
Dim cleaning As String = "Cleaning Inspection"
Dim damage As String = "Damage Repaired"
[code].....
Another program I am working on for fun, I am basically shuffling a list inside a listbox, what I want to do is delete the rest but not sure how to go through with that. At the moment I have this: [code] Just contains the code, declarations outside weren't included.So anyway, once clicked, it will call on the function to basically shuffle in a for loop, I was wondering if I should (or how should) create another function and call it in the click button or have just a loop in the click button so it deletes half the list. What I am doing is I have 20 list of items, I want the program to shuffle the items and then deleting the lower 10, meaning, if I had 10 items and wanted 5 top, I'd want: 0, 1, 2, 3, 4 and deleting 5, 6, 7, 8, 9.
View 7 RepliesI am attempting to read the results from a SQL query into a List(Of) and I can see the List.count while adding items to the List increments, however in another part of my code when I am attempting to read the List the List.Count returns 0. My List is as follows:
[Code]...
I have an error panel that is subbed in to a page if an error goes wrong to gracefully handle and display errors.Currently, I am just appending the error messages to a string and pushing that to a label. If you have multiple errors, this gets messy.I'd like to push each error to a list item in a bulleted, unordered list.How can I dynamically generate, from a vb codebehind file, new list items inside of an undordered list element?
View 2 RepliesI have two generic lists, named ListA and ListB. Both ListA and ListB could potentially have duplicate items. What I would like to do is use LINQ to grab the items in ListB that are not in ListA, but I'm unsure how to do so.
View 8 Repliesi want to search item A (from a list of X items) in list B but i want to get the item not found example Search ITEM A in LIST B if not found then return a print....if found continue with ITEM B..and so on.
View 5 RepliesThat was probably bad title, but I'll illustrate what I'm trying to do. I have a method in a class that I need to call several times. The method returns a List(Of String). I'm just grabbing some information from a database.
VB.NET
Public Function GetTestList() As List(Of String)
Dim int As Integer = 0
[code]....
I'm trying to make an Aduto-Forum poster with VB.NET windows form application[url]...
I insert username & pass but I can't click the Login button because there are 2 buttons with the same ID on the page.[code]...
How can I click the second button. [code]...
I have a List(Of MyObj), and I want to iterate through that list and compare each element to all other elements in the same list, excluding (if possible) the same element. I have a solution that works, but it's slow and uses double For loops. It may possibly have also summoned Cthulhu from his sleep. This below is a sanitized version of what I have:
Dim MyList As New List(Of MyObj)({Obj1, Obj2, Obj3, Obj4, Obj5, Obj6})
If MyList.Count > 0 Then
For i = 0 To (MyList.Count - 1) Step 1
[code]....
I am writing app in vb.net
I have two variables one with list of RoomRate and other with list of RoomTypes.
We have RoomRates and RoomTypes linked with RoomTypeInfo variable insite the RoomRate.
So how do i find the RoomTypes which donot have the RoomRates Defined.
My Sample Code:
class RoomType
property UIN as integer
property Title as string
end class
[Code]......
I want to know how to test the 1st list box if it has items more than the other list box but by one item, here is what i have: If lstInvisibleTv. Items.Count > lstInvisiblePc.Items.Count Then it works good if the lstInvisibleTv list box is greater than the other list box by one but it also works if it is greater the other one by one or more which I do not want. I want it to work just by one.
View 3 RepliesI have a Xtragrid where when I double click the row I need to be able to pass the value of one of the columns to a stored procedure. There's got to be an easy way to do this but I haven't been able to find it.
View 9 RepliesI'm just startet to work with datasets, I have configurated an SQL server 2008 to host my databases. the server works fine also over the internet. I am making some SQL test applications, to learn how to use SQL and datagridview.my problem is how can i select a specific cell in my dataset and datagridview. When i know the name of the column and the row that holds the specific cell that i want to select by click on a button
my datagrid look like this
name | price | color | company | left
______________________________
[code]......
The following is a sample order[code]...
I bring this file into a dataset in visual Studio. The problem ixs that I cannot associate a particular set of options with a particular line item - I can't distinguish Item num="0" from Item num="1" and so forth, because the element 'Item' presents itself as a table withing the dataset, and the element 'Option' also presents itself as a table within the dataset. I don't know how to connect the two.
I would like to know how i can programmatically select a row of a DataGridView that contains a specific value in the first cell of that row.E.g, I want to click a button that selects the row of my DataGridView where the first cells of that row contains the number 3.
View 5 RepliesI have code that downloads a webpage into an .html or a .txt file so I have the webpage source code, how do I:Search the HTML source code in the file for a keyword anchor point (Hair Color, it's unique in the entire webpage source code)Step down 3 linesAssign what ever is on that line to a variable called FoundIt?
View 4 Repliesim trying to select a specific bit of data from a table in access using sql in vb.net. My select statement so far is sql = "select [UserAccessLevel] from Member where username = '" & tusername & "'"Useraccesslevel and username being columns in the table and tusername being a variable that stores the username im using to look up the useraccesslevel in the table.
Was wondering if any of you knew anything about select statements.
I am making a program which remembers my last selected row in a data table. I have done this by adding a column with a CheckBox, upon CellClick the CheckBox is checked, and upon ellLeave it is unchecked and the new cell is checked, after every action a Update command is run. There will never be more than one row with a checked cell in the DataGridView,however, the data table is in a relationship with other tables, so there may be more checked cells in the data table itself. My problem now is selecting the row with that cell when I open the program and when changing between other data tables and back again.All solutions I found on selecting a specific cell in a DataGridView are referring to index numbers, and in my case I need it to find a data value in a column, I do not know the specific row, only that one row contains the value of True while everything else is False.
View 4 RepliesI am trying to access a specific item in a listbox. For example, I have 5 items in a list box and I need each one on a different textbox, but I cannot find the code necessary to access a individual item in a listbox. I need the third item in a textbox but I cant find the code to access that SPECIFIC item and turn it into text in the texbox.
View 2 RepliesIf Not m_Batchs Is Nothing Then[code]...
I have this list view (which is working fine) and i want to find an efficient way of populating it in a specific order, ie by date, by identity etc.
I know i can use linq but as i understand this is inefficient. If m_batchs is a large list of objects then i will looping through this list many, many time (as linq behind the scenes loops through the object collection).
How can I add all the items of a specific column of a listview. For example I had a listview of a class like:
name............... surname............... age
------------------------------------------------
asdsa..............asdasdasd................21
sadsad..............asdasdasd...............23
sadsad...............adasdasd...............24
I just want to add all the numbers of age column so I can find the total sum of ages of the students. I want, when I clicked my button It makes my textbox's text = 68 for this example.
