I have got a question to you. I want to know how I can check the listview items in form1.listview1.items and me.listview1.items to see that if both listview have got the same text property of the items then display the messagebox that says "you can't add the same items again. Please select a different item and try again!", otherwise display the messagebox that says "the items have been added".
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A first chance exception of type 'System.NullReferenceException' occurred in MyApp.exe
A first chance exception of type 'System.ComponentModel.Win32Exception' occurred in System.dll
1- How can I check the size of a variable? Size in bytes, not length. (;
2- What data can be stored into byte variables? And what the maxium size of the variable?
3- How do I store data inside a byte variable?
To check if a setting has been set, I currently use:
If My.Settings.Username <> "" Then If this the best way to check? Is there a better way?
I am developing an application for multi user using vb.net with back end as ms-access. For the table name as employee_master, there is a column, name as student_profile having datatype as Yes/No .
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i have a list of record that already populated but my problems is How to find out if there are any duplicates? VB.NET
View 3 Replies(Visual Studio Visual Basic) many times, and I populate the ListView columns with data using SQL statements that pull data from a database. I'm now trying to use a ListView with the addition of check boxes.
View 4 RepliesLet's say I have 50 cars and I created 6 attributes for each of the 50 cars (therefore 300 total variables and values for those 300 variables). These attributes are created and valued based upon the following structure:
Car1Name = "Dark Red Car"
Car1Color = "Dark Red"
Car1DoorCount = 4
Car1Cost = 10000
Car1Appeal = 10
Car1BoughtStatus = False
Car2Name = "Bright Red Car"
Car2Color = "Bright Red"
Car2DoorCount = 4
Car2Cost = 11000
Car2Appeal = 8
Car2BoughtStatus = True
and 48 others of similar structure/syntax
How do I take a a module with these variables and values and populate them into a listview within a form such as Form1 and ListView1 without continuously going into listview's UI and manually entering the data? The goal is to show the USER a list of 50 cars, their color, door count, cost, appeal, and purchase status.
This line of code references a checkbox in a Gridview, how can I assign the value of the check box 1 or -1, I think it is for checked or unchecked, to a variable so that I can run an if statement against it, and change it to True or False?
dt.Rows(row.DataItemIndex)("DisplayString") = (CType((row.Cells(3).Controls(0)), CheckBox)).Checked
I want to check If a variable is equal to some values or not, for example:
if a = 1 or a = 5 or a = 7 or a = 10
is it possible to do it like sql:
if a in (1,5,7,10)
I have a BaseClass, a DerivedClass1 and a DerivedClass2 from a third party library. DerivedClass1 and DerivedClass2 both inherit from BaseClass.There's a ContainerClass, from the same library, with a member variable ActiveItem, which can be of DerivedClass1 or DerivedClass2, so it is declared as BaseClass.I want to know if ActiveItem is of DerivedClass1, as it can change in runtime without notice.If I do
Dim isDerivedClass1 as boolean = TypeOf(oject.ActiveItem) Is DerivedClass1
then I get a compile time error, telling me that ActiveItem can never be of DerivedClass1 type.I have tried several combinations of GetType and TypeOf but it doesn't seem possible to check this. I have also tried to declare an auxiliary DerivedClass1 variable and comparing their types, but haven't got any luck either.
Edit:The following code doesn't compile in vs2005 SP1.
Public Class Base
Public x As Integer
End Class
Public Class Derived1
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In Visual Studio 2010 is it possible to check the state of variables during run time. When a run time error occurs the error is highlighted and you are able to mouse over different variables to see their values when the error happened. I would like to do something similar except without the error.
View 7 RepliesI have a struct setup like the following[code]...
I then loop through a counter and add each PersonInfo object to the Dictionary. The Primary defaults to false if the Code is already in the Dictionary, but if it has not been inserted into the Dictionary, I want to set the Primary to True. It would be easy to check if the Code was the key, but I can't because the Code is not unique.
I have some web pages that include other pages, and I need to check if a variable (a string) has been declared in the page or not.
I was exploring try catch and finally, but im always getting a compiler error saying the variable doesnt exits.[code]...
I'd like to know if my textBox1 variable has the ABCAttribute. How can I check this?
View 3 RepliesI have a ListView that contains 3 checkboxes per row. I want to set it up so that only one checkbox can be selected at a time. Here is my current CodeBehind...
Public Class MyClass
Dim Checkbox1 As Checkbox
Dim Checkbox2 As Checkbox
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Let me know if I need to include anything else. Right now when I click a checkbox and another checkbox is selected then both are selected instead of just the new one..
How can you check all the checkboxes of all the items in a listview?
View 2 RepliesI have a project which is 98% complete. Its basically a Shop(till) interface. I have a form that has tabs the first being the main till, second shows a listview with everything in stock and the quantity of items in stock. Im stuck on one part of the program where when the form loads it checks the stock and if any of the items have a quantity less than 5 for example than it displays a message box to the user telling him/her to order new stock, but im not sure exactly how to do that.
View 5 Repliesi want to get the row(s) when the checkbox is check/uncheck in the listview..
For Each Item In CheckedItems
If (Item.SubItems(4).Text) = "Cash" Then
'Code Here
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I have a window which has 8 items in a listview along with 2 radio buttons below the listview. The user is able to select one or more selections in the listview and turn the selection on or off with the radio buttons(live, prior to hitting the submit button), my question is how do I tell which selection was changed? I was going to put the one or more selections into a string/array and use that later for some messages once the user hits the submit button. I can almost think of it but can't quite get there, i'll be using an if/else with the .selected option in listview items but am not sure how to tell if the user, say,goes back and changes the option from On to Off(Off originally)to remove that option from the array.
View 2 Repliesi cant really find how to code check and uncheck or if listview 1. selected item = checked then.
View 2 Repliesi have create 1 listview & checkbox inside listview. how to print check item in listview.
View 6 RepliesI have a text file that stores processes marked safe/bad which saves like this
*2010-04-18*AvastSvc.exe*Avast Nullspace(forcheckbox) * date * process * Comment
How do i get *AvastSvc.exe* minus the ** and check to see if it has appeared in the listbox???
Also i cant find on google how to make my treeview always fully expanded on startup
I'm trying to make it so that if a user checks the listview item checkbox, it does something, but not when the code checks it. This seems really basic.
View 2 RepliesI am using visual studio 2008. I need to use the listview tool with checkboxes instead of the checked list box as with the ListView the properties can be set that the user can only have one choice.
Problem: I am not sure on the code to manipulate what option has been picked. I want it to output the same as the code below. I know how to manipulate a checked list boxes by the example code below:
If (ChkdListChoice.SelectedIndex = 2) Then
LstDisplay.Items.Add("Spicy Chicken - �3.50")
price = price + 3.5
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I'm working on my listview to extract the strings from my php source. I want to check for each array in my listview when i finds the matches of html tags "<span id=""mystrings2"">Enabled", then tick for each checkbox in the listview when the matches are found.
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ok in vb6 i would use this to check all items in a listview.
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Now Here's my confusion. And i spotted at least one other person on here who was asking the same thing about this.But got no real clear answer that i could see. as a test to compare i tried his suggestion and loaded the same listview up in both a vb6 app and a vb.net app..The list i used was quit large so the comparison would be very through..my list was in the 80,000 lines range tho..yeah talk about overkill The vb6 app checked/unchecked the items within a matter of milliseconds..the vb.net took an extremely long time tho..well not extreme but was very noticeably slower about doing the loops.
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I have a ListView object with the View property set to Details. I also have the CheckBoxes property set to True. When a user clicks the checkmark I have it run through some code in the ItemCheck event. Assuming the checkbox is
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With the code above, the check box still changes state regardless (Checks and unchecks). How can I force it to stay with the current state before the user clicks on the checkbox?
Dim myObject As Something There I defined my variable myObject of type Something. But, as you can see, I am giving it no value yet. Sometime on runtime I want to check if myObject is holding a value or not. I tried this: If myObject <> Nothing Then But apparently I can't do such comparison.
View 3 RepliesI want to see if a variable's type is string or double type. How to do it in vb.net immediate window?
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