Limiting The Number Of Items In A List Box?
May 19, 2011Does anyone know how to add a limit to the number of items in a list box? For example, you can't add more than 10 items in ListBox1.
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Limiting A Textbox To Enter 10 Digit Number Only?
Oct 15, 2011how can i limit a user to enter 10 digit no like telephone no in textbox without using regular expressions?
View 12 RepliesLimiting Textbox To Enter 10digit Number Only?
Oct 9, 2011how can i limit a user to enter just 10 digit number (minimum 8 but not more than that 10 in any case) in a textbox(like telephone no)?
View 4 RepliesVS 2008 - Limiting Number CheckBoxes You May Select?
Jun 2, 2012I am creating an application in Visual Basic '08 with four available checkboxes. Is it possible to limit the number of checkboxes you may select down to 2, and how may I go about doing this?
View 12 Replies.net - Implement A List(Of) With A Maximum Number Of Items?
Nov 14, 2011I'm trying to figure out a good way of implementing a List(Of) that holds a maximum number of records.
I have a List(Of Int32) - it's being populated every 2 seconds with a new Int32 item.
I want to store only the most current 2000 items.How can I make the list hold a maximum of 2000 items, then when the 2001'th item is attempted to be added, the List drops the 2000'th item (resulting in the current total being 1999).
Thing is, I need to make sure I'm dropping only the oldest item and adding a new item into the List.
Pattern For Limiting Number Of Simultaneous Asynchronous Calls?
Apr 9, 2010I need to retrieve multiple objects from an external system. The external system supports multiple simultaneous requests (i.e. threads), but it is possible to flood the external system - therefore I want to be able to retrieve multiple objects asynchronously, but I want to be able to throttle the number of simultaneous async requests. i.e. I need to retrieve 100 items, but don't want to be retrieving more than 25 of them at once. When each request of the 25 completes, I want to trigger another retrieval, and once they are all complete I want to return all of the results in the order they were requested (i.e. there is no point returning the results until the entire call is returned). Are there any recommended patterns for this sort of thing?
[Code]...
VS 2010 Program To Check The Number Of Items In A List Box?
Jul 6, 2010I want the program to check the number of items in a list box, then send use that number to form a FOR loop and send each to the serial port individually. It actually sends everything, but the program always crashes after the last one saying that the sdprintcount variable is an invalid number for the index. I don't get it as this happens no matter how many items are in the list, and it always crashes on the last one. It sends it, but then it says the index number is invalid.
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Dim sdmods As Integer
Dim sdmodsp As String
sdmods = sandwichmodlist.Items.Count
[code]....
C# - LinqToSql - Prevent Sub Queries When Limiting Number Of Rows Returned?
Sep 16, 2009Dim query = (From p in Parent _
select _
p.ID, _
Tags = String.Join("|", p.Child.Select(Function(c) c.Tag.TagName).ToArray)).Take(100)
In the above query, when using Take to limit the rows returned, a separate SQL query is executed for each row to return the 'Tags' field. If I remove Take(100), a single query to sent to Sql Server.So, how do I limit the number of rows returned, while preventing a new sub query being executed for each row?
Limiting The Number Of Characters Can Enter Into A Windows Forms Textbox?
Jan 28, 2012Assuming that I have a Windows Forms textbox and want to reduce the maximum amount of characters that can be allowed in via user entry, how would I do that?
View 2 RepliesVS 2005 - Limiting The Combobox Drop Down List
Sep 18, 2009My combobox dropdownlist contains 60 to 65 items. So i want to show 5 items in the dropdownlist of my combobox and add a vertical scroll bar in it so that the user can scroll it and see the items. How to add a vertical scroll bar in the combobox dropdown list? I want to add this vertical scroll bar only when the dropdown list contains more than 5 items.
View 5 RepliesGet The Number Of Items Or Size Of Items In The Recycle Bin?
Dec 14, 2011I've got some old code of mine that I'm going back to and updating a little bit. On one part of it I need to check if there are any items in the recycle bin or not.
This is the code I was using to accomplish this:
vbcode
Private Declare Function SHQueryRecycleBin Lib "shell32.dll" Alias "SHQueryRecycleBinA" (ByVal pszRootPath As String, ByRef pSHQueryRBInfo As SHQUERYRBINFO) As Long
Private Structure ULARGE_INTEGER
[Code]....
The msgbox and end is just in there for debugging purposes. This always returns all 0s, even when I know that there is something in the recycle bin.
Determine If Property Is Generic List<of T> Via Reflection And Loop List Items
Oct 1, 2009I'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)
Placing Selected/unselected Items In Checked List Box Into List Boxes?
Mar 16, 2011This 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].....
Shuffling Items Inside A Movie List / Need To Delete Half List
May 16, 2011Another 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 RepliesList.count While Adding Items To The List Increments Returns 0
Jul 20, 2011I 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]...
Dynamically Generate List Items To An Unordered List In ASP.NET?
Nov 27, 2009I 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 RepliesFinding Items In One List That Aren't In A Second List Using Linq
Jan 25, 2011I 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 RepliesVS 2008 Search Item A (from A List Of X Items) In List B?
May 5, 2010i 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 RepliesVS 2010 Return Items In A List Before Returning The List?
May 23, 2012That 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]....
Comparing An Item In A List Against Other Items In The Same List In .NET?
May 30, 2011I 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]....
Getting List Of Items Not In Parent List Using LINQ
Mar 28, 2011I 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]......
How To Test 1st List Box If It Has Items More Than Other List Box But By One Item
Nov 15, 2011I 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 RepliesProgram That Will Compare Array Of Grocery List Items Glist And Array Of Coupon Item List
May 27, 2012I have a program that will compare an array of grocery list items glist and an array of coupon item clist.When I compare the two and if there is a match somewhere in the array I want to have a picturebox visible.When there is no match, I want the picture box not to be visible. [code] The code seems to work great until I come to the else statement.When the code finds a match it displays the picture box and the msgbox without error, but as soon as the message box is cleared, even though i've input it as an ELSE statement, the picturebox goes false again.Does anyone have any idea of how I can "hold" the picturebox to stay visible while the match between the arrays exists?
View 18 RepliesRemove Items In One List From Another List?
May 2, 2012i am writing a program that reads a excel report from accounting software with our weeks orders on... so basically the program reads a list of around 100 items which all works fine.I also have a database that holds info on each item, when the excel sheet is parsed the software checks to see if any new items have been added to the list that are not on the softwares database. this is where i am having the issue.I have two lists: ItemsOrdered & ExistsingItems.
All the items ordered this week are in ItemsOrdered and all the items not in the items in the database are in the ExistsingItems list. using these two lists how can i find items that are in ItemsOrdered but not in ExistsingItems.
Remove Duplicate Items But Leave At Least One Of The Duplicate Items In The List?
Mar 27, 2012I have a List object and I want to remove the duplicated items but leaving at least one of the duplicated items in the list;I wrote something like this however I would optimize this code for better performance, is there something faster?
Const chars As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
Dim rnd As New Random()
Dim mylist As List(Of String) = Enumerable.Range(1, 100).Select(Function(i)
[code].....
Asp.net - Count The Number Of Items In Cart?
Jun 12, 2011i am developing an online shopping site..so when the user adds any item to the cart i store it in a table...now what i want is to count the number of items in the cart as well as update the number of items in cart every time the user adds a new item....
Public Function AddToCart(ByVal itemID As String, ByVal itemName As String, ByVal itemPrice As Integer, _
ByVal offer As String, ByVal buyNo As String, ByVal userID As String) As String
Dim sqlStatement As String = "INSERT INTO shoppingCart" & _
[code].....
Check Number Of Items In Listbox?
Jan 17, 2009I have a listbox, textbox, and a button. every time I push the button, an item from the listbox is put into the textbox. when the button is pushed again, it grabs the next item in order and puts it into the textbox. so on and so on until it gets to the last item. once I get to the last item it keeps repeating the last item over and over again. SO what I was wondering is how do I get a messagebox or some sort of checker to tell me when it has moved the last item from my listbox to the textbox?? PS textbox2.text=0 and every time the button is pushed another number is added to the value of textbox2.text. so basically if I could figure out how to grab the value of lines at any given time in listbox I could call a msgbox up!! here is the code I am currently using[code]...
View 3 RepliesGet The Size Of The Array And Not The Number Of Items In It?
Nov 3, 2009When you use array.length you get the size of the array and not the number of items in it.
For example:
Dim MyArray(10) as String
MyArray(0) = "Potato's"
MyArray(1) = "with"
MyArray(2) = "salt!"
MyArray.Length will return 11
How do I get the number 3? I am creating a class library so it's kinda hard to keep testing all kinds of methods until I get the right one .
Sorting Items (number) In Listbox?
Jan 21, 2011i have 1 button, 1 listbox and 1 textbox.this is my code
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
ListBox1.Items.Clear()
Dim finish As Integer = TextBox1.Text
[code]....
if i set the sorted property of listbox1 to true that code will add 0 before the inputted number so that the sorted property in listbox1 will be usefull in sorting integers.
for example i have 1,15,30,36
it will make 001,015,030,036
thats what i think am not sure because i cant edit the code so that it will work in my program.
Using Array With Unknown Number Of Items?
Apr 7, 2011I'm trying switch from using arraylist to arrays. Seams like arrays are not as easy to use when you don't know the size of the array.
Is it possible to use an array without having to specify the size of the array like in this example?
[Code]......