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• How to know what tab is selected in tab control in vb.net

  - by user225269

  I have this program that should execute a piece of code base on the tab that is selected. How do I do it? I've tried: if tabcontrol1.tabcount=1 then 'Execute this code' else if tabcontrol1.tabcount=2 then 'execute this code end if -But doesn't work, what's the proper way of doing it?

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• Sending Email in .NET Through Gmail

  - by Mike Wills

  Instead of relying on my host to send email, I was thinking of sending the messages though my gmail account. The emails are personalized emails to the bands I play on my show. Has anyone had success doing this?

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• .NET: How to know when serialization is completed?

  - by Ian Boyd

  When I construct my control (which inherits DataGrid), I add specific rows and columns. This works great at design time. Unfortunately, at runtime I add my rows and columns in the same constructor, but then the DataGrid is serialized (after the constructor runs) adding more rows and columns. After serialization is complete, I need to clear everything and re-initialize the rows and columns. Is there a protected method that I can override to know when the control is done serializing? Of course, I'd prefer to not have to do the work in the constructor, throw it away, and do it again after (potential) serialization. Is there a preferred event that is the equivalent of "set yourself up now", so that it is called once whether I'm serialized or not? The serialization i speak of comes from the InitializeComponent() method in the form's code-behind file. #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { ... } It would have been perfect if InitializeComponent was a virtual method defined by Control, then i could just override it and then perform my processing after i call base: protected override void InitializeComponent() { base.InitializeComponent(); InitializeMe(); } But it's not an ancestor method, it's declared only in the code-behind file. i notice that InitializeComponent calls SuspendLayout and ResumeLayout on various Controls. i thought it could override ResumeLayout, and perform my initialization then: public override void ResumeLayout() { base.ResumeLayout(); InitializeMe(); } But ResumeLayout is not virtual, so that's out. Anymore ideas? i can't be the first person to create a custom control.

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• .NET: Strange behaviour of double.Equals() when boxing.

  - by Vilx-

  What's going on here? int zero = 0; double x = 0; object y = x; Console.WriteLine(x.Equals(zero)); // True Console.WriteLine(y.Equals(zero)); // False

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• Perform a function at a specific time in VB.NET

  - by Shardul

  Hi, I am writing a small app to automatically connect my PC to the internet at a certain time.. I am using rasdial.exe for it... Private Sub SetIt_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Dim windir As String = Environment.GetEnvironmentVariable("WINDIR") Shell(windir & "\system32\rasdial.exe", AppWinStyle.NormalNoFocus) End Sub My question is how to make the shell function run at a specified time or after a certain interval?? Regards, Shardul

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• .net Components ... a Custom Form

  - by carlos

  Hi, I've been working in the creation of some custom components adding functionalites to the basic components such as a Datagridview. Now I want to create a custom Form ... I mean, when I choose add new item in the VS menu, there is a Windows form and some varians of it like an about box, or Dialog, that are simple Forms with a custom controls already on it. I want to have a login form for my set of applications, so this login is avialable for all the development team to use it in the different modules. How can I develop the form and then add it to the "Add New Item" screen? Thanks !!!

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• Adding controls dynamically at design time vb.net

  - by chris

  I have been developing some custom smart tags. I am using a DesignerActionMethodItem which gets me to a fired method in code. When I try to hit the controls.Add the control is added but it seems the designer is unaware of it. It is never serialized and it goes away when the form is refreshed in the designer. Any help would be greatly appreciated. I am sort of stuck and google hasn't helped me. Please don't send me anything about smart tags that has nothing to do with adding controls dynamically at design time, I have already read so many looking for this.

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• Why no ArgumentEmptyException in .NET ?

  - by Andrei Rinea

  I am beginning to think I am doing something wrong. I mean they did place System.String.IsNullOrWhitespace finally but no ArgumentEmptyException class. public FilterItem(string name, IEnumerable<string> extensions) { if (string.IsNullOrWhiteSpace(name)) { throw new ArgumentNullException("name"); } if (extensions == null) { throw new ArgumentNullException("extensions"); } if (extensions.Count() == 0) { throw new ArgumentOutOfRangeException("extensions"); } this.Name = name; this.Extensions = extensions; } throwing an ArgumentOutOfRangeException feels unnatural. Also an instance of ArgumentException is too general in my opinion. It's easy to me to create a new exception class call it this way and have it over with. What bugs me is that it's not in the BCL/FCL and I am beginning to think there's a good reason not to have it. Should there be one?

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• changing "application files" folder in vb.net

  - by every_answer_gets_a_point

  i understand that some files get published to this folder in my application. i want all the files to be in the same folder. how do i do this? meaning that i want the setup.exe and everything to be in one folder after i have published the application. i dont want to have an application files folder at all

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• Thread vs ThreadPool - .Net 2.0

  - by NLV

  Hello I'm not able to understand the difference between Thread vs ThreadPool. Consider i've to manipulate 50,000 records using threads. In case of threads i need to either predefine no of threads or no of records per threads. Either of them has to be constant. In case of threadpool we dont need to set any of them theoretically. But practically we need to assign the number of records per thread, because the no of threads may grow extremely large if the input no of records is huge. Any insights on this?

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• Int128 in .Net?

  - by Adam Tegen

  I need to do some large integer math. Are there any classes or structs out there that represent a 128-bit integer and implement all of the usual operators? BTW, I realize that decimal can be used to represent a 96-bit int.

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• Problem with CruiseControl.net configuration

  - by Pawel

  Hi I started using ccnet to build my project. This is quite new issue for me so I have some problems. First thing: Why does ccnet copy directory with my project to another directory (ccnet creates new folder named the same as project name included in ccnet.config file and copies to them directory with my project) Second thing: Dashboard page cannot show reports for recent build (When I click on any item in recent build then I get page: "The page Cannot be found" I suppose that page cannot link files with logs. but I don't know how to link it. I create one publisher: <publishers> <xmllogger logDir="c:\Branches" /> Can anyone help me?

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• Date format error in vb.net ?

  - by ahmed

  I get this error when I run the application Incorrect syntax near 12, on debugging I found that this error is caused due to the # along with the date. Dim backdate as datetime backdate = DateTime.Now.AddDays(-1) on binding the data to the grid to filter the backdate records this error is caused Incorrect syntax near 12. myqry = " select SRNO,SUBJECT,ID where datesend =" backdate Now i am trying to extract only the date or shall I divide the date into day , month and year with DATEPART and take into a variable or convert the date or what should i do , Please help ???

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• opening transaction validation in vb.net

  - by Mark

  Can anyone help me on how can I validate transaction example: transaction = mySqlConn.BeginTransaction(IsolationLevel.ReadCommitted) If there's still an opened transaction, then the code above will ignore.. How do I know if there was a transaction not yet committed before opening new transaction to avoid Nested Transaction?

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• What is the minimum interface that has the Count property in .Net

  - by SoMoS

  Hello, I need to change a method that has one parameter that takes a serie of objects. I need to find the lowest Interface (in inheritance tree) that has the Count property. Until now I was using the IEnumerable but as this has not Count I need to change it to the wider interface possible so the method can work with the biggest number of types of series (collections, lists, arrays, etc). Thanks in advance.

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• VB.Net: Detect Webcam

  - by Ben

  How can I programmatically detect whether a webcam device is plugged in to the PC or not, return 'True' or 'False.

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• Get all folder / directories list in VB.net

  - by Henry

  Hi, this is my first Stackoverflow question, im learning VB and having a few problems with getting a list of all folders/directories on the system, im using the code included here and it seems to work until it hits the recycle bin folder, and some other system folders Sub main() Dim DirList As New ArrayList GetDirectories("c:\", DirList) For Each item In DirList 'add item to listbox or text etc here Next End sub End Sub Sub GetDirectories(ByVal StartPath As String, ByRef DirectoryList As ArrayList) Dim Dirs() As String = Directory.GetDirectories(StartPath) DirectoryList.AddRange(Dirs) For Each Dir As String In Dirs GetDirectories(Dir, DirectoryList) Next End Sub Can anyone help me with this, id like to know what is causing this first, and a good fix, or alternative way to do this. Thanks in advance.

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• Binding a Button to a GridView

  - by Tyler

  This a pretty simple question, I'm just not sure how to do it exactly. I would like to bind a Button or perhaps ImageButton to a GridView in ASP.NET/C#. Currently, the GridView has two columns and is bound to a DataTable with two columns. I want to add a third column to the GridView, which will include the Button. I know GridView has ButtonField, but I'm not too sure how to go about using it to do what I want. I want to dynamically generate these Buttons and add them to the GridView. Here is how my GridView looks right now: <asp:GridView ID="GridView1" Runat="server"> <Columns> <asp:HyperLinkField HeaderText="Display Name" DataNavigateUrlFields="DISPNAME" DataNavigateUrlFormatString="ViewItem.aspx" DataTextField="DISPNAME"> <ItemStyle Width="70%" /> </asp:HyperLinkField> <asp:BoundField DataField="TypeDisp" HeaderText="Type"> <ItemStyle Width="20%" /> </asp:BoundField> </Columns> </asp:GridView>

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• Manipulating / Resizing / Scaling an image in vb.net

  - by Christian Payne

  Imagine I have a rectangle say 400px x 300px. Then let’s say I want to load an image in that. All of this is very easy using Sytem.Drawing.DrawImage. But then I want to leave the left hand side as 300px but change the right hand side to 250 px. I can draw the box using 4 DrawLines but I don’t know how to squash the image into the new shape. I want the right hand side of the shape to be 250, the left size 300 and the top and bottom 400px. I can’t use DrawImage as it expects the left and right sizes to be the same. Is there a way to manipulate the image into the new shape? I've looked at other questions, but they only apply where the left and right hand side is equal. Any thoughts on how to squash an image into a shape which did not have parallel sides? (If it helps, I'm happy to sacrifice image quality to fit the right shape.)

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• Lucene.Net memory consumption and slow search when too many clauses used

  - by Umer

  I have a DB having text file attributes and text file primary key IDs and indexed around 1 million text files along with their IDs (primary keys in DB). Now, I am searching at two levels. First is straight forward DB search, where i get primary keys as result (roughly 2 or 3 million IDs) Then i make a Boolean query for instance as following +Text:"test*" +(pkID:1 pkID:4 pkID:100 pkID:115 pkID:1041 .... ) and search it in my Index file. The problem is that such query (having 2 million clauses) takes toooooo much time to give result and consumes reallly too much memory.... Is there any optimization solution for this problem ?

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• Why .NET Boolean has TrueLiteral and TrueString?

  - by user309937

  Why in Boolean type there are two fields with the same value? internal const int True = 1; internal const int False = 0; internal const string TrueLiteral = "True"; internal const string FalseLiteral = "False"; and public static readonly string TrueString; public static readonly string FalseString; static Boolean() { TrueString = "True"; FalseString = "False"; } in reflector generated code, methods don't use those strings but: public string ToString(IFormatProvider provider) { if (!this) { return "False"; } return "True"; } would't it be better to use those const values?

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• Better Reporting for CruiseControl.NET

  - by Michael Sync

  Hello, Is there any way to generate the good error report from Cruise Control? I like to get the following things in that report. The line number of File that break the build The name of developer who commited that file. (It should not be related to last person who committed because the build might be broken earlier before last person check-in. ) Thanks.

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• VB.NET: Scrollbar "button"?

  - by Omega

  I plan on using a scrollbar for, well, scrolling an image. The image is 200x500, however, the only visible area is 200x250. So I set the max value to 250, and the min value to 0. The idea is that if I drag the scrollbar's button to the bottom, 250 pixels will have moved for the image, right? But wait, the scrollbar's button is.... very small. And the scrollbar is actually pretty long. Is there a way to make the scrollbar's button longer?

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• vb.net array for slideshow button

  - by StealthRT

  Hey all, i am in the middle of trying to figure out how to go about doing this... I have a form that i call like so: call frmSlideShow.showWhat(1,4,8,9,11,22) Each of the numbers represents a different image slide (slide1.png, slide4.png, etc..). The problem i am having is trying to create a "previous" and "next" button to flip through them all. Trying to figure out what number the user is on and going from there and seeing what numbers are still left from the list above that was sent, etc. If anyone has an idea how i would go about doing that then that would be awesome! :) David

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• Are there any hierarchical, multi select controls that use check boxes in .NET

  - by Daniel

  I need to be able to select multiple options on a web form, but those options are hierarchical. For example: Option 1 Option 1 a Option 1 b Option 2 The user should be able to select Option 1, or Option 1a, etc. Selecting Option 1 a should automatically select Option 1. Any controls/solutions out there that fit the bill? (I'm not looking to spend $)

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