Removing multiple items in a ListView "at the same time"

Windows Forms General

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    - Performance impact on use of this/me keyword The this/me keyword isn't required in many circumstances. Is there a performance advantage or disadvantage to using it when it's not required Gus Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Custom Folder I need to create folder in every user folder when i setup my application on other machines Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Modal Form Hi all, I need to show a form as dialog to a parent window only not modal to the entire application. see if i have three forms form1, form2, form3 first i showed form3, then form1 and set form2 as modaldialog from form1 , now i cannot access form3 also without closing form2, ie form2 is modal to the entire application Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Why to double click SQL DB File for connecting. The fact that you're not seeing the connection in Server Explorer would explain why you get the exception. When you double-click the file we recreate the connection for you. But what's interesting is why the connection isn't created automatically when you open the project. Normally VS will do that for you. A few of questions: 1. Is this a web site or a client app (Windows forms, console, etc.) a. If a web app, is the database file stored under your App_Data folder 2. Is Server Explorer already opened when you open your app 3. Do you have any VS service packs installed 4. Are you running over a Remote Desktop session or are you working directly on the local machine Thanks, Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Web browser problem Under Internet Options in IE, click the Advanced Tab. Under Security, check "Allow content from My Computer" Hope this helps, Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Assigning icon from default settings on target machine I know that the icon for the .pdf extension is correct as the file that the start menu shortcut is targeted at (in the installation folder in Program Files) has the correct icon. Also I can query the registry to extract the correct icon. This information just doesn't seem to get passed on to the shortcut in the Start menu though. If I create a shortcut by hand, next to the actual PDF, it picks up the correct icon. If I move this shortcut to the start menu, it still has the correct icon. There just seems to be something special about the shortcut that the Visual Studio setup project creates (if I right-click on it and select Properties, the Change Icon button is greyed out, unlike the shortcut I created by hand). Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Textbox value lost while validating This looks like it's a bug in .net. With the form set to autovalidate = diabled, then a call to validatechildren causes validate events on all the controls on the form, but only the first one with changed contents generates a property-set call. However - once I implemented INotifyPropertyChanged in my object, (even without actually raising the event at all ) everything behaved as it should . . .very strange. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - DataGridView, CheckBox fields and Strongly Typed datasets.... Im now seeing this happen with a Datagridview that has no check boxes but instead has a dropdown cell and a couple of button cells. Does the VS design team know about this issue Its not earth shattering by any means but it is annoying and it does take some time to reset all the fields back to the way that they are supposed to be. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Find a window control at a point on the screen Can you give me more details on how to do that I am really confused. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - MaskedTextbox and allowing only valid int input I’m trying to setup a MaskedTextbox on a form to allow for only valid int input, but can’t seem to get something that I’m happy with. What I need is that the user enter something that’s entirely numeric (no decimals or negative signs), a minimum of 1 digit and a max of 4 digits. I’ve set the following properties: Mask=”0000”; ResetOnSpace=false; TextMaskFormat=MaskFormat.ExcludePromptAndLiterals;, and if you type in “323_”, or “_323”, its fine, and it doesn’t allow the user to press space. But, if you clear the field and type 3 (right cursor over) 23 to produce “3_23”, it obviously does not parse as a valid int. I then decided to try setting the maskedTextbox1.ValidationType = typeof(int); and setting up a typeValidationCompleted event, but unless the whole mask is completed (4 digits), it fails. How can I get this to work in my favor Its almost to the point that I just roll my own based on the standard textbox. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - CheckedListBox DataSource property Hello As mentioned in the documentation, it is not recomanded to used the DataSouce, DisplayMember and ValueMember properties. Does anyone have an idea why Thanks, Gil Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - DataGridView Scrollbar Ok, VB guys, I translate my codes into VB.NET for you: Public Class DgvScroll Inherits Form Private timer As Timer Private dt As DataTable Public Sub New () MyBase .New() InitializeComponent() End Sub Private Sub DgvScroll_Load( ByVal sender As Object , ByVal e As EventArgs) Handles MyBase .Load dt = New DataTable dt.Columns.Add( "id" , GetType (System.Int32)) dt.Columns.Add( "name" ) dt.Columns.Add( "aa" ) Dim j As Integer = 0 Do While (j < 25) dt.Rows.Add(j, ( "Row " + j.ToString), "aa" ) j = (j + 1) Loop Me .DataGridView1.DataSource = dt 'HScrollBar hScroll = this.dataGridView1.Controls[0] as HScrollBar; Dim vScroll As VScrollBar = CType ( Me .DataGridView1.Controls(1), VScrollBar) AddHandler vScroll.Scroll, AddressOf Me .vScroll_Scroll AddHandler vScroll.MouseLeave, AddressOf Me .vScroll_MouseLeave timer = New Timer timer.Interval = 3000 AddHandler timer.Tick, AddressOf Me .timer_Tick timer.Start() End Sub Private Sub vScroll_MouseLeave( ByVal sender As Object , ByVal e As EventArgs) timer.Start() End Sub Private Sub timer_Tick( ByVal sender As Object , ByVal e As EventArgs) Me .dataGridView1.DataSource = Nothing Me .dataGridView1.DataSource = dt End Sub Private Sub vScroll_Scroll( ByVal sender As Object , ByVal e As ScrollEventArgs) timer.Stop() End Sub End Class Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Parent, child forms check if open or closed Hi all, I'm new to c# and currently working on a project containing mdi forms. This is how the project is layed out. Parent form is called Street_Index. This contians a menu strip which can open 2 different forms. * Street_Search * Office_Search Within the Street_search form there is a button that i click that returns the results in another form called Search_Results. Search Results contains a grid and on double clicking the column of the grid it returns the results of that row back to Street_Search form which displays them in textboxes, grid, combobox, etc.. Within the Office_Search form there is also a button that opens the Search_Results form and then from there you can double click on the grid within Search_Results and open up Street_Search form which will display the results as previous. Now onto the question. What is the cleanest possible way to check to see if a childform is open or not and if it is refresh it or bring it into focus Thanks in advance Take care all. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Suddenly I'm getting this error: The form referred to itself during construction from a default instance Thanks, I realised it was because I was declaring a new dataview in another form as a global object in that form, which referred to frmData. If I declare the dataview but leave it until the form's load event to supply its table, rowfilter etc the problem doesn't occur. Thanks again for your help Louise Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - datagridview - testing values of an unbound column Hi there. I have a datagridview that I populate via a table adapter and everything is working just fine. Now i'd like to give the user the option of: selecting multiple records in the grid by checking a checkbox. this checkbox is available for each row of data and i created it by adding an unbound column. What i'd like to do is enable a button on the same form only if one or more records have been selected by the user. how do i do this I was thinking about using the event: Private Sub DataGridView1_CellContentClick( ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick End Sub but this event can potentially be fired many times and for any column that's selected. Any suggestions Also, what's the easiest way to allow the user to edit the data for a given record I need to do another query when they request an edit because the current datagrid doesn't show all the details for the record. I intend to launch a new window to do this. Please and thanks. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - how to host different controls in the same column in DataGridView control Hi, I am trying to create a datagridview. And in one column i want to have different type of cells (hosting different editing controls). For example, in the same column first cell shall host a combo box control, second cell shall host a text box control, third cell shall host DateTime picker control, another with Colorpicker control, etc. if i follow the host controls in windows forms Datagridview cell and c urrently if i change the cellTemplate property of DataGridViewColumn to calendarcell, then all the cells in that column become calendar cell. But instead i want to have a different control, for example colorpicker, in the next cell ie the one below this. Please advise how to achieve this using datagridview cell. -Madhu. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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  - 1
    - How to lock a control on a design form Hi there, I've created a design form at runtime using "System.ComponentModel.Design.DesignSurface" and cousins. I now want to lock individual controls on the form depending on conditions. I know I can do it this way: TypeDescriptor.GetProperties(myControl)["Locked"].SetValue(myControl, true); but this seems irregular. Is there a more mainstream way or is this it. Thanks. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - DataGridView ImageCell Description Hi, I have a dataGridView control on the form and it is not data bound. I have an image cell(whenever required) which is needed to display the image as a thumbnail. I want to display a description next to the image. I have tried using the 'Description' property, but it doesnot seem to work. I don't have an image column. I just create an image cell when needed. Thanks! Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Usefullness of any event Mario, I haven't used the Paint event yet. I take it that it fires multiple times. Do the multiple firings execute you code over and over Do the multiple firings help you or, if it was built differently, i.e, to only fire cleanly only once, would you prefer that Thanks. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - column caption i'm trying to use the column caption but it didn't work. i'm currently using microsoft visual studio .net 2003. i check the online tutorials and did the same, but the caption never turn up at the datagrid. can anyone advise me on this below is my codes. another issue is that, is it possible to change the colour of columns with using tablestyle count = Db.Observation; counter = 1; year = Db.year; mth = Db.mth; DataColumn Quantity; for ( int i=0; i<count; i++) { if (mth > 12) { year++; mth = 1; } Quantity = new DataColumn(year+" / "+mth, typeof ( int )); Quantity.Caption = "Data " + counter; productTable.Columns.Add(Quantity); counter++; mth++; } Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - How do I reference a control's properties? Under the assumption the Button and the TextBox are on the same form: Void Go_Click(System::Object^ sender, System::EventArgs^ e) { System::Form form = (System::Form) ((System::Button) sender)->Parent; System::TextBox textBox = form->textBox1; textBox->Text = "Hello World"; } Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Record Locking and Transactions in Strongly Typed Datasets Hi kia, Yes, change the source code of 'xxxDataSet.Disgner.cs' manually will make it work. Hope this helps. Regards. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - hide and show a process??? You could try making the form completely see through (set opacity to 0%). You could also hide the form(try this.Hide(); and set the ShowInTaskbar property to false. This should make the form 'invisible'. Hope this helps. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - TreeView Comtrol: Add buttons to nodes in TreeView control I am now using TreeView in my web page. I want to add some buttons next to some of the nodes in the treeview. The button should be aware of the value of its corresponding node in the tree. Is there any good way of doing this Thanks! Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Access Denied Reading Registry Perhaps you have assumed incorrectly: I do not work for Microsoft. Therefore Microsoft has not given you a "crappy explanation". Furthermore, often comments are brief. This is because the person asking the question should do some experimentation, consult documentation, etc. If you have additional questions, they tend to be answered in 2 days or less, but no one is required to do so. As to your original problem, the only operation that an ordinary user can perform on that subkey is read. You cannot write it or delete it unless your code to do so runs as administrator. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
  - 10
    - How do I Find The Product Code? This is driving me crazy and it must be simple. I am trying to find the product code so I can author manifests for installing MSDE. How do I find product codes for things I want to install I must be missing something easy. Do we just make them up For example here is the product code for SqlExpress ProductCode="Microsoft.Sql.Server.Express.1.0" Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Menustrip reading XML I stand corrected! Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Can we Add ListItem objects to ListBox ? You can add anything to ListBox because it accepts an object and every type in .Net is somehow directly or indirectly inherits from the object class. It better to Inherit from ListItem and override its ToString() method so atleast you can have meaningful view of its in ListBox: Here: public class MyListItem : ListViewItem { public override ToString() { return this.Text; } } I hope this will help. Best Regards, Rizwan aka RizwanSharp Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Using the Windows password in my application I have a WinForms C# application for which I currently have two methods of login - either the user enters their password when they log in, which I store in my SQL 2005 db encrypted, or I just let them in based on their windows login id. In both cases I do not ask for a username, I get this from their Windows network login. What I would like to do is something that I have seen other applications (Lotus Notes) do. If your application password is the same as your windows password, it just lets you in, but if they are different then you must enter the application password. I am not worried about the db login, just the application login. I have been searching for an example of this, but I have not had any luck. If this question has been already asked and answered, my apologies, but please point me in the right direction. Later I will need to do the same thing in an asp.net application, but right now my problem is only winforms. Any help would be appreciated. Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Bring to Front Form Problem I want the mainForm to be owner of other forms because i need all the behaviour characteristics of this relation except of the fact that the mainForm can never be brought in front from its children. Is this a way to bring the parent form in front of its children Thanks for comments Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - How do I allow the user to enter a negative number in a column on a grid with validation? This is my 1st C# VS proj and I'm having some difficulty validating data entered on a column. HEre's the code. if (dgExtents.Columns[e.ColumnIndex].Name == "Sequence" ) //number is currently < 300 { dgExtents.Rows[e.RowIndex].ErrorText = "" ; int newInteger; if (dgExtents.Rows[e.RowIndex].IsNewRow) { return ; } if (! int .TryParse(e.FormattedValue.ToString(), out newInteger) || newInteger < 0) { e.Cancel = true ; dgExtents.Rows[e.RowIndex].ErrorText = "the Sequence value must be a number" ; } if ( string .IsNullOrEmpty(e.FormattedValue.ToString())) { dgExtents.Rows[e.RowIndex].ErrorText = "Sequence is a required field" ; e.Cancel = true ; } Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms
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    - Programatically trigger keyboard shortcut I want to trigger a behavior for which a third party component provides a keyboard shortcut. The user can trigger this behavior with CTRL+SHIFT+V, but I want to programatically trigger this behavior in certain circumstances. Any ideas Tag: Windows Forms General Removing multiple items in a ListView "at the same time" Windows Forms

SeeSharp

Hi all,

Suppose we have 5 items in the ListView: "Alpha", "Bravo", "Charlie", "Delta" and "Echo". When we execute RemoveAt(0) followed by another RemoveAt(0), the first two items got removed. If we execute RemoveAt(0) followed by RemoveAt(1), "Alpha" and "Charlie" got removed.

What I want to achieve is: I can multi-select items in the ListView to decide which items i'd like to delete. For example, I select "Alpha" and "Delta", so the index 0 and 3 are stored in SelectedIndexCollection. Then I enumerate this collection to delete these two in one run. At this time, if I run RemoveAt(0) first, the index of "Delta" will be changed to 2.

Can I delete multiple items "at the same time" in the collection without having to mess with the indices

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Re: Windows Forms General Removing multiple items in a ListView "at the same time"

nobugz

Classic trick, iterate backwards:

for (int ix = listView1.SelectedIndices.Count-1; ix >= 0; --ix)
listView1.Items.RemoveAt(listView1.SelectedIndices[ix]);

These would be easier though, ListView is smart enough to make this work:

foreach (ListViewItem item in listView1.SelectedItems)
listView1.Items.Remove(item);

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