Detect If A Listview Is Empty?

Aug 26, 2010

I want an if statement to detect if a listview is empty and then show a message;

If lvwoutstandingproj.
MsgBox("No outstanding practices present", MsgBoxStyle.Information, "VeriSIS")
End if


Detect Clicking On An Empty Listview?

Oct 19, 2010

Is there a way to catch the vent when a user clicks on an empty listview/details control please? I want to enable the listview when a user clicks on it and disable another control. Or should I be using another control?

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Detect Empty Image In Picture Box?

Jun 11, 2010

I used code below to save image. It works fine.[code]...

1) How to detect if there is no picture in box?

2) How to assign a null value to @signature?

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Detect Picturebox Is Empty Or Have A Picture?

Jun 21, 2010

How to detect picture has a picture on empty?Suppose , I droped a picturebox control on form, there is no image loaded in it, what codes should I needed those will tell me that picturebox is empty?

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.net - Detect Empty Results In A Linq-To-Entities Query?

May 29, 2009

The only way I know of is awkward:

'check for empty return
Dim count As Integer = (From s In myEntity.employee Where employeeID = myEmployeeIDVariable).Count
'If there is a record, then process


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C# - Empty ListViewGroup Is Not Shown In ListView?

Mar 5, 2012

I could not find any remarks on MSDN ListView.Groups Property that empty ListViewGroup will be hidden. Is it by design, or I am missing something? My sample code below will show only "group 2" with item "item1".

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles MyBase.Load
Dim gr = New ListViewGroup("group 1")


Is there are any way to show ListViewGroup without adding dummy item

For now the only workaround idea I have is to use collapsible listview (Vista and up)

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Disable Button While ListView Is Empty?

Nov 8, 2010

How would I go about disabling a button while the ListView is empty?

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Event Detect Change Of Listview Item Count?

Jun 22, 2010

Is there a event detect change of Listview item count? Like it will be trigger whenever i add an item or delete an item form listview. I search on MSDN Listview Event member, but cant c any usefull.

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VS 2008 Event To Detect Changes In Items Collection In Listview

Jan 16, 2010

I'm trying to create an inherited version of the ListView control that (among other things) should have a different background image if the listview is empty to if it has items.Obviously you can easily enough test the count of the collection, but I need to be able to react to the event, however there doesn't appear to be any event related to adding/removing items.

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DataGridView - Convert Nulls To Empty Strings And Display It In The Grid As Empty Strings

May 14, 2009

I have a DataGridView that has some columns with dates. It binds to an in-memory Datatable which gets loaded from an string array of data passed back from the backend Some of the rows returned have nulls for the date columns. Solution 1: If I define the Date column in the DataTable as "string" I can easily convert those nulls to empty strings and display it in the grid as empty strings (desired results). However, if the user clicks on the date column header to sort by date, it doesn't order the rows as you want. You get a purely string sort order. Not acceptable


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Nothing Equals String.Empty, Null Does Not Equal String.Empty?

Jun 28, 2010

This must've have been asked before but I couldn't locate it. In a mixed code project (VB and C#) we were debugging some old Visual Basic code where a statement as follows could be found:

If Request.Params("xxx") <> "" Then
'do something

I considered this a bug as Request.Params could be null, in which case the statement would've become false which wasn't the idea. So I thought. I just found out, -- probably for the tenth time and I will keep forgetting -- that the following two statements are not equal, while Nothing in VB should be equal to null in C# (thought I):

if(String.Empty == null) // always false
If String.Empty = Nothing Then ' always true

Should I dismiss this as a typical Microsoft backward compatibility effort, or should I consider this a huge error in the VB.NET compiler? Does anybody know the Microsoftean opinion on this oddity?

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Arrays - If Not String.Empty Ignoring Empty String

Aug 11, 2010

I have a array of strings and I am looping through them, but the string might be empty so I am trying this:


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Format Listview : Head Of Listview Textalign = Center And Item Of Listview Textalign = Right?

Mar 12, 2009

i want to format listview head of listview textalign = center and item of listview textalign = right

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VS 2010 Listview Add And Select - Populate A Listview And Leave Selected Records That Are True

Apr 19, 2012

I want to populate a listview and leave selected records that are true

I have a DB record which is ID int, desc varchar, selected boolean.

I have tried the code below

LVProducts is a Listview and DS is a dataset


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Listview In Child Form - Listview Will Not Access With My Add Button Control In FrmCreateUserType

Jul 29, 2010

I have 3 forms, one frmMain - main form, second is frmUserType- childform, and the last frmCreateUserType. In the main form I have a menu item to open my frmUserType, In this form I have a button to open another form which is my frmCreateUserType, In this form I have a button to add records then update the listview in frmUserType. The problem is the listview will not access with my add button control in frmCreateUserType. I tried not to used mdiparent declaration for my frmMain and frmUserType as children and it works, so meaning that the problem is showing my frmUserType as childform?I am using 2008

Code to open my second form (frmUserType)


Code for my add button to update the listview in frmUserType


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DoDragDrop List View Item Reordering - User Can Drag Media Tracks From One Listview To Another Listview

Feb 12, 2010

I have a media browser program I am building. I am trying to use drag/drop so a user can drag media tracks from one listview to another listview and then use the second list view as a playlist in windows media player com object. Reading at MSDN I have found out that there is no built in support for item re-ordering with the listview control. I have listview1 working correctly but when I try to reorder items in listview2, the dragged item ends up at the end of the list. So basically I need to get the item insertion index corrected. I have tried more than 10 times to get this code right.

Here is my code which includes a form with two listview's.

Public Class Form1

Private Sub ListView_ItemDrag(ByVal sender As Object, ByVal e As _
System.Windows.Forms.ItemDragEventArgs) Handles ListView1.ItemDrag, _


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Columns Of Listview Can Be Resized Automatically Based On Information In Listview?

Feb 15, 2009

I would like to know if it is possible if the columns of the listview can be resized automatically based on the information in the listview?

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Copying Multiple Selected Rows In A Listview And Putting It To Another Listview?

Feb 22, 2012

I have two listview in a separate form, basically what i want to do is whenever I select a row in my first listview the items in that selected row will be copied in my second listview which is empty.

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ListView Rowheight Varies - Using ListView Control, With SmallIcons Style ?

Mar 15, 2012

I'm using ListView control, with SmallIcons style in VB.NET. Icons are loaded fine, but when I start to scroll ListView down or up from scrollbar (clicking from arrows), rowheight drops to about half from normal in next 20-30 rows below/above upper/bottom row (depends from the scrolling position). After 1-2 seconds, ListView is "refreshed" and scrolling continues normally. When focus in on the ListView and I'm moving up/down with arrow keys or PageUp/PageDown, everything is normal. Any suggestions, what is happening? SmallIcons size is 16 * 16. Is it compulsory to set "Blank icon" with SmallIcon size to all rows, when adding them or what? Wasn't like that in VB6, how is it in VB.NET?

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VS 2008 - How To Access Listview Data - Program That Contains A (listview) Control

Sep 22, 2009

I have a vb-2008 program that contains a (listview) control.

View = details
AllowColumnReorder = true

Lets say the table has 3 columns (a,b,c) and 1 row of data.

a b c
1 2 3

I want the user to be able to re-arrange the columns (by dragging the column headers) before printing the contents of the table.

c a b
3 1 2

Statements like:

.. ListViewX.Columns(2).Text
.. ListViewX.Columns.Item(2).Text
.. ListViewX.Items(0).SubItems(2).ToString

Give the column-name (c) and cell-contents (3) of the origional table .. not the (3rd) column (b) of the re-arranged table.

How can i get the column-name and cell-contents of the (3rd) column of the re-arranged table?

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VS 2008 ListView Index - Find Out What Item Has Been Selected In A ListView?

Mar 21, 2010

Do I really have to go through all this just to find out what item has been selected in a ListView?


Isn't there something fundamental like this? Is absolutely everything in VB.NET buried beneath a colossal heap of bureaucracy?

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VS 2008 Use Current Listview To Generate MsAccess Data In 2nd Listview?

Mar 20, 2010

i am developing a point of sales system. currently i have my product code scanned and displayed in a listview. lets say that i have 5 product codes displayed in my first listview. By clicking on a button, how can i use these codes to call upon the details (prices, product name, etc.) of the corresponding codes and display in another listview?

i am using Visual Basic 2008 and MsAccess as my database. who have the idea on solving my question. (As my last thread has not been answered at all..

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Make The Listview Sort The Listview Items By Column?

Jun 22, 2010

im trying to make the listview sort the listview items by column (whichever column was clicked, sort the list based on that column)

in vb6 it was done by:
Private Sub ListView1_ColumnClick(ByVal ColumnHeader As MSComctlLib.ColumnHeader)
Static olditem&
With ListView1


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Use Current Listview To Generate MsAccess Data In 2nd Listview

Mar 20, 2010

i am developing a point of sales system. currently i have my product code scanned and displayed in a listview. lets say that i have 5 product codes displayed in my first listview.

By clicking on a button, how can i use these codes to call upon the details (prices, product name, etc.) of the corresponding codes and display in another listview?

i am using Visual Basic 2008 and MsAccess as my database.

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VS 2008 ListView Instead Of CheckedListBox - Add The Size Of File In Listview

Jan 18, 2012

I want ListView instead of CheckedListBox files in checkedListBox is being updated via ListBox1 How can I add the size of file too in listview


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Data From Listview To Be Loaded To Another Listview But Different Forms?

Apr 21, 2009

I am having a problem regarding to pass all the data on the listview from one form to another and add another columns. The purpose of my columns is that I want to put text from there because I am sending a mail but I want to get the status of my message if it failed or send and write it at every end of the rows.

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How To Populate The Listview It Populates All Of The Listview Items

Mar 13, 2012

I have the code below and when I try to populate the listview it populates all of the listview items but only the first subitem. No clue what I've got wrong.[code...]

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Loading Contents Of Listview To Another Listview Which Is On A Different Form?

Feb 22, 2011

I have one form which calculates something and displays it into the listview but then when Print button is clicked another form will appear which has a differently layout but same information. And on that print form there is another listview, how I would load the contents from the first listview to the printout lsitview which is on a different form.

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Search In ListView And Populate The ListView Table?

Mar 11, 2012

Here's my code and It's now working. I put that in "txtSearch.text"

If lvList.View = View.Details AndAlso lvList.Items.Count > 0 Then
Dim lvItem As ListViewItem = lvList.FindItemWithText(txtSearch.Text, True, 0)


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VS 2005 Display The Listview Subitem In The Listview?

Aug 27, 2009

I am trying to display the listview subitem in the Listview .Actual Problem Dispaly:I have to dispaly the three values :

BARcode CheckoutFlag TAGUID
L00657 Loo657 E00010003E

But ,I am getting the wrong display:

BARcode CheckoutFlag TAGUID
E00010003E Loo657 E00010003E

I am unable to print the barcode value.where ever Ia m able to display the Little value.The main two functions are below.
Private Sub rfLoadtoList(ByVal iBarcode As String, ByVal iTitle As String, ByVal ImgIndex As Integer, ByVal bgColor As Color, ByVal frColor As Color, ByVal cFlag As Boolean)
Dim Srnumber As Integer


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2005 - Copy ListView To ListView?

Jan 23, 2008

VB.NET 2005

Anyone has a quick way to copy a listview to a new listview?

It tried the following, but it crashes ..

Dim arrTemp(lvwTemp.Items.Count) As ListViewItem
lvwTemp.Items.CopyTo(arrTemp, 0)


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Listview Data Transferring To Other Listview

Mar 16, 2012

im using 2008 and i would like to ask if is it possible that if i click a data in my listview then it would go to another listview and using a db

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Add Empty Value To A DropDownList In MVC

Jun 2, 2009

I'm building a data entry interface and have successfully bound the columns that have reference tables for their data using DropDownList so the user selects from the pre-configured values.

My problem now is that I don't want the first value to be selected by default, I need to force the user to select a value from the list to avoid errors where they didn't pick that field and by default a value was assigned.

Is there a more elegant way of doing this than to add code to include an empty value at the top of the list after I get it from the database and before i pass it to the SelectList constructor in my controller class?

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Have An 'empty' Date?

Feb 11, 2012

I was wondering what is the best way to make sure a date is 'empty' so that, if it hasn't been set by the user, that situation is testable.

I've checked and found one way of approaching the issue:


Is the second one more of a stop-gap measure? Is the first way the sanctioned way (which hopefully doesn't entail a lot of complication with testing/setting the values of the date)?

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How To Empty Recycle Bin

Feb 26, 2008

I have been all over visual basic websites but I cannot find How to empty Recycle bin. I just want a simple button on my Form to "Empty Recycle Bin" and if possible to open Recycle Bin as well with a button.

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How To Set An Empty XElement

Dec 22, 2009

Im trying to add a Xelement to an XElement. But when I tried to add this XElement to the empty XElement VB throws "Object reference not set to an instance of an object" The Bold line code throws the exception

here the sample code: Private Sub Button_OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_OK.Click


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InputBox Is Empty?

Mar 20, 2009

[code]......If someone leaves the txt2 empty.... and they click the button how can I pull up another inputbox like for <= 0?

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Looking Up Empty Textbox

May 2, 2010

I created a button in my form which is used to add a new textbox.But before that, the button should identify if all the textboxes that have been created are empty.If there is an empty one, it would not add a new one.[code]

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Value Of 'g' Cannoy Be Empty

Oct 16, 2009

I am having problems with optional parameters, I have declared a method as follows [code] This tells me that the value of "g" cannoy be empty.I put an if statement in there to see what is going on, OrganizationGuid is equal to nothing. How is that possible? I have declared it as a string and gve it value, when when it falls into the method it "is nothing". How can i make sure that it gets value?

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VB Check If Int Is Empty?

Nov 22, 2010

A really boring question, sorry, but I really don't know that yet ;) I've tryed always string.empty, but with a decimal, there is an error.

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