Add A Newline To A Windows-forms TextBox?

Aug 19, 2009

I am trying to add a line of text to a TextBox component in, but I cannot figure out for the life of me how to force a new line. Right now it just adds onto what I have already, and that is not good.I have tried copying the actual linebreaks, didn't work. I tried AppendText(), didn't work.


Check If A Newline Exists In A Multiline Textbox (windows Forms)

Feb 11, 2009

I'm trying to count characters in a textbox, which includes newline characters and tabs. How do we know if the textbox contains only newline characters? ie or if the user types in one or more characters, then a bunch of "newline" characters (CR followed by LF) and then goes back and deletes the original one or more characters leaving only the leading "newline" characters. I don't want to count the characters in textbox only if new line exists..

If String.IsNullOrEmpty(TextBox1.Text) Then
Label5.Text = 0


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Unable To Cast Object Of Type 'System.Windows.Forms.Button' To Type 'System.Windows.Forms.TextBox'

Apr 28, 2009

I have a panel with some controls in it (several textboxes, a slider, 2 buttons, and a small groupbox).. When I click a button, I want all of the textboxes within the panel to be readonly... So I have this code: [code] When I run it though, I get the following error:Unable to cast object of type 'System.Windows.Forms.Button' to type 'System.Windows.Forms.TextBox'.If I remove a button, it moves on to give me the same error but for a label..

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Oct 4, 2011


Why it is that the text boxes have errors like this even they are in the tax forms..

Label13.Text = sss.Text - philhealth.Text - pagibig.Text
Label18.Text = semiSalary.Text - Label13.Text


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File I/O And Registry :: Each Line Of Textbox To A Newline Of Textfile?

Aug 24, 2009

i know i have to use a loop to get each line of the textbox onto a newline of a textfile but i dont know how to figure out how many lines of text the user has entered into a textbox. I tryed using a try statment to loop until it errors, it seems to work sometimes but other times it only takes half of the textbox and adds it to the textfile. And if atmaweapon reads this, i tryed to make better names for variables. Here is my code,

Path = ("Meals" & ComboBox1.SelectedItem & "" & TextBox1.Text & ".txt")
File = New System.IO.StreamWriter(Path)
If ComboBox2.SelectedItem = "1" Then


how many line of text there are... im not so shure how good it is to run a loop tell it errors for a textfile, but its the only way i could think of.

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Richtextbox - .NET Rich TextBox Newline Character Removal?

Aug 19, 2009

I am using a Rich TextBox in VB.NET and passing to a StringBuilder. I need to replace the New Line character from the TextBox with either a space or a comma. Problem is the standard codes for new line don't seem to be picking up this New Line character in this case. Is there a specific character used in Rich TextBoxes as the New Line?

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Can't Set Focus On A Windows Forms Textbox?

Jun 9, 2011

I can't seem to get input focus on a textbox when a tab page first comes up (I'm using Windows Forms, VB.NET 3.5). I have a textbox on a panel on a tab page, and I want the focus to be on the textbox when the tab page comes up. I want the user to be able to start typing immediately in the focused textbox without having to click on the textbox. I have tab stops set in the order I want and the textbox is the first tab stop. The tab stops work except that when the tab page comes up the focus is not on the textbox, i.e. the one that's first in the tab order.

In the Enter event handler of the tab page I call the Focus method of the text box, but it returns False and does nothing, no error messages. I know I can access the text box because at the same point in the code I can set the text of the text box.If it matters, the layout of the tab page is a little complicated:[URL]..I want to set the focus on TextBox1.

What's the best way to get the focus on the desired textbox? If setting focus is the best way, why is the textbox.Focus() method failing?

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Assigning Buttons To Textbox With Windows Forms?

Nov 2, 2009

How do I make a connection between a button and textbox when using windows form applications. In other words, if a button is clicked on, how do I assign it to read that certain textbox where the information was entered?

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Entering An Answer On A Textbox In Windows Forms?

Apr 5, 2012

I am creating a program that shows two random numbers on two separate labels then I have to add / subtract them and the answer should be entered in a textbox

How can I add or subtract the numbers and enter the answer on a textbox?

I am creating it in Visual Basic Windows Forms Application

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Windows Forms Textbox Auto-change

Oct 5, 2011

I've got a Windows Forms with some Textbox's and I'm trying to make a one of them which can automaticly (or if you press Enter) change letter D to today's date, to make user life easier.

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Winforms - TextBox Validation In .NET And Windows Forms?

Mar 5, 2009

I'm using the following code to validate the text entered by user. It works perfectly fine. But I want to add the backspace feature so as to allow the user to delete the wrongly entered number.I have tried a couple of things and they worked but before last digit (after the decimal point) i.e. it does not allows to delete after the number has been completely entered.number is being entered in the format: 12313213.45

What shall I do?Private Sub TextBox5_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox5.KeyPress


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Check Validate Text In Textbox + Windows Forms?

Feb 17, 2010

I am new to Win Forms, I have a scenario here..When User enter ID in a textbox, I want to check that value in database and get the name for that ID before submitting the Submit Button.

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Create A Misc Properties For A Textbox In Windows Forms?

Mar 18, 2009

I am using 2008,how to create a misc properties for a textbox in windows forms?

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Drag From Windows Forms Textbox To .NET Code Window?

Oct 6, 2009

I have written a little helper app that mostly does various text operations on a paragraph of text.  I am able to select  a block of text from the Code Window and drop it onto my VB.NET apps TextBox and complete the text operation.  However I am unable to drag and drop the altered text back to the VB Code window Via the DoDragDrop method.

If e.Button = MouseButtons.Left Then
Dim d As New DataObject
Me.TextBox3.DoDragDrop(d, DragDropEffects.Move)
End If

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Error'Value' Is Not A Member Of 'System.Windows.Forms.TextBox'

Apr 28, 2010

ERROR:Error'Value' is not a member of 'System.Windows.Forms.TextBox'.

My Code:

Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.TextChanged
If TextBox3.Value > TextBox2.Value Then


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Adding An Event To A Dynamically Created Textbox - Windows Forms App?

Jan 27, 2012

OK, so my project is like this:The user selects a folder from their computer that holds a list of subfolders. The program then dynamically inserts a check boxes per subfolder within a seperate cell of a Table Layout Panel.I want to and a simple Click event to each checkbox control so that when a control is clicked, it counts all of the check boxes on the form that are checked.How do I go about adding the event handler to the checkboxes when they are created. Here is the code that adds the checkboxes:

Dim iCol As Integer = 1
Dim objFolder As Object = Nothing
For j = 0 To rCount - 1 '0 to dynamic number of rows


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Forms :: Convert Console.WriteLine To Windows Form Textbox?

Apr 18, 2010

I'm an absolute newb to vb (less than a week) and I'm trying to convert a console app to a windows form.In the console app, I have this code

Public Sub rconPacketReceive(ByVal fromserver As Boolean, ByVal isresponse As Boolean, ByVal seq As Integer, ByVal words() As String) Handles rconObj.packetIncoming
Dim w As String = Nothing
For Each word In words


What I want is to have this Console.WriteLine displayed in a text box on the form but don't have any idea on how to do it.

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Limiting The Number Of Characters Can Enter Into A Windows Forms Textbox?

Jan 28, 2012

Assuming 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?

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Windows Forms Textbox Stored Procedure Code Injection?

Jul 12, 2011

I have the following sub in a windows form:

Private Sub BTNC_storeclientdata_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BTNC_storeclientdata.Click
' Update Clientdata[code].....

This performs an update in the SQL Database via a stored procedure. When I add '; insert into codeinjection(test) values ('CodeInjected!'); select ' in the last textbox (TBC_phone.Text) the value 'codeinjdected' is inserted into the table codeinjection as well. How can I avoid this?

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Re-direct Output From A Console Application To A Textbox In A Windows Forms Application?

Sep 14, 2010

I am trying to use the System.Diagnostics.Process class.I have the following Windows Forms application. It consists of 1 Button and 1 TextBox. The only code is for the button click event as follows.

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim myProcess As New Process()


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Error "2 Operator '<=' Is Not Defined For Types 'System.Windows.Forms.TextBox"

Mar 4, 2011

im sure that this is incredibly simple but im very new to this. could someone tell me what Error 2 Operator '<=' is not defined for types 'System.Windows.Forms.TextBox' and 'Integer'. K:programmingchapter 4 labchapter 4 labchapter 4 labForm1.vb 16 24 chapter 4 lab

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VS 2010 String Conversion - EValue Of Type 'String' Cannot Be Converted To 'System.Windows.Forms.TextBox'

Apr 8, 2011

I'm trying to code a program but this error repeatedly shows up and I can't for the life of me figure it out EValue of type 'String' cannot be converted to 'System.Windows.Forms.TextBox'. It appears in relation to this code


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Operator '*' Is Not Defined For Types 'System.Windows.Forms.VscrollBar' And 'Systems.Windows.Forms.VscrollBar

Oct 29, 2011

I am trying to use values from form1 in my project, in form2, but Im not sure how to do it. I've tried

txtboxTotal = (Form1.vsbLength * Form1.vsbWidth) * Pattern

But I get: operator '*' is not defined for types 'System.Windows.Forms.VscrollBar' and 'Systems.Windows.Forms.VscrollBar.'

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Implicit Conversions From 'System.Windows.Forms.Control' To 'System.Windows.Forms.Webbrowser'

Sep 8, 2010

I have the code which checks if there is a selected tab

Private Function GetBrowser() As WebBrowser
If TabControl1.SelectedTab IsNot Nothing Then
For Each c As Control In TabControl1.SelectedTab.Controls
If TypeOf (c) Is WebBrowser Then
Return c


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Unable To Cast Object Of Type 'System.String' To Type 'System.Windows.Forms.TextBox'

Jun 12, 2011

Unable to cast object of type 'System.String' to type 'System.Windows.Forms.TextBox'.

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Can't Copy Paste Cut Code - Gives Error "Unable To Cast Object Of Type 'Public_Information_System_Remake.PIS' To Type System.Windows.Forms.TextBox"

Mar 31, 2011

same errors or something related to Unable to cast object of type 'Public_Information_System_Remake.PIS' to type 'System.Windows.Forms.TextBox'.


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Basic Application(windows Forms) Doesn't Exit Properly After Navigating Through Forms

Jul 9, 2010

I have a basic three form application. It doesn't seem to close after navigating through forms. If I were to open the application, and the main form is displayed. If I press the X button, the application closes fine(Goes from processes) If I were to open the application, and then navigate from the main form to another form using me.hide &, and press the red X on Form1, the application again, closes fine.


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Forms :: Visual Studio 2010 Windows Forms App Screenupdating Property?

Jun 4, 2011

.NET developing and have a simple question, i've been stuck on this for a while and searched many forums first with no solution so i'm posting myself. In VB for excel i've used Screenupdating=false to disable the screen updating however now i'm creating a visual studio 2010 windows forms application and its not showing up as a property. Here's the code i've tried.


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Application That Has Multiple Front Ends Developed Using Windows Forms / WPF / ASP / Compact Framework Mobile Forms

Apr 9, 2010

I have the requirement to create an application that has multiple front ends developed using Windows Forms, WPF, ASP and Compact Framework Mobile Forms.I would like to be able to create a series of obejct representing the business logic and have this logic accessible from the various front ends available. My first thought was to use remoting as I'd like to be able to pass the business objects back and forth between client and server but the compact framework doesn't support remoting and also transferring a full framework business object to a compact framework business object doesn't seem possible.My next thought was to use web services but again the passing of business objects seems to be very hard to accomplish. Without doing this I would have to create individual web methods for each business operation.

Finally my next option is to use sockets and write the whole client/server logic within some classes and expose them to the UI/Business layer. My only problem with this is it is not scaleable should the number of clients increase dramatically whereas using remoting or web services I can host the solution via ASP.Net.Does anybody have an ideas on the best way forward for this or even have any input on how they would write an application that required a windows form, wpf, asp website and mobile device GUI all of which want to use the same business logic?

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Forms :: Startup A Second Windows Forms Inside The Parent Form?

Aug 26, 2010

I would like to know if its possible to start up a second windows forms inside the parent form. Ex: A button is pressed and a new form is showed. I would like to keep that new form inside the parent form, and have it not be able to go outside the parent form.

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Forms :: String Cannot Be Converted To

Mar 31, 2010

I am writing a program for my A-level coursework But for some reason I got this build error this has never occurred to me before, I have no idea why I can't use string for the name of my form.

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Forms :: Windows Forms App Copy A File To A Preset Folder?

Jan 9, 2012

a program and i need to have a button put a file into a folder, i know how the button works i already have it doing some other stuff. i just don't know the code to copy and past it to a folder.

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Inherits System.Windows.Forms.Form Is Missing In New Forms?

Mar 5, 2012

When I add a new, empty form to my VB.NET VS9 project, the linenherits System.Windows.Forms.Formis missing.What am I doing wrong here?I thought it would be added automatically.I experienced that some thing get weird if this line is not there (Form_Load is not firing, I think).

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Winforms - How To Load Binary To Windows Media Player In Windows Forms

Jul 24, 2011

I've successfully saved video files into SQL server as varbinary. Now, my problem is, how can I play those videos in Windows Media Player (embedded in my Windows Forms).

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Code Works In A Windows Forms Application, But Not In A Windows Service

Jan 19, 2010

I'm porting code that I wrote for use in a Windows Forms application to a Windows Service, but for some reason, the code that worked in the Windows Forms application is now throwing errors in the Service

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Forms :: Disabling BackGround In Windows Application Same As Windows Cardspace

Sep 24, 2010

I am making a System Tray Application when i minimize my form its hide itself in the tray but whenever i click on the tray icon my form shows now when my form shows up i would like to disable my Background desktop same as CardSpace when its shows up.

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Scroll In Windows Forms Treeview Only On Windows Server 2003

Apr 10, 2012

I have a problem with scroll in a treeview in a Windows forms application (Framework version 3.5).

The strange thing about the problem is that on Windows XP, Windows 7 and Windows 2008 the scroll works as excepted, but in Windows Server 2003 SP2 the scrolling doesn't work. Enable/disable Visual Styles doesn't seem to make a difference on Server 2003.

Steps to reproduce the error:

1. Add a treeview to a form and add x nr of root items (and 1 sub item to each item).

2. Expand a number of nodes. The non-standard thing here is that we are changing the node integral height because we display a usercontrol with the treenode (See example of the code below).

3. When you scroll afterwards, you cannot scroll to the bottom node. The scrollbar is all the way down, but we are not seeing the last node.

Public Shared Sub SetNModeHeight(ByVal Node As TreeNode, ByVal IntegralHeight As Integer)
'Create instance of tvitemex structure.


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Forms :: Command Line Args In Windows Forms?

Aug 2, 2010

I was playing a game recently and saw that they could use args in the shortcut, and I decided to try to impliment this into my far, I got: (runs this sub on load)

Sub startup_args()
If Environment.GetCommandLineArgs.Contains("+game") Then
Dim path As Array = Environment.GetCommandLineArgs


just to see what it returns, but the application crashes. I also tried path.tostring(), but that didn't work. When I did:

If Evnironment.GetCommandLineArgs.Contains("+game") Then
Dim path as string = Environment.GetCommandLineArgs.tostring


but that returned the value "SString.Array[]"...

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Forms :: Creating A Sub Main In A Windows Forms Project?

Sep 13, 2010

What is the equivalent to accomplishing this?

static void Main()
frmCalcView view = new frmCalcView();


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Sharing Business Logic Between Windows Forms And Web Forms?

Feb 4, 2010

My question is, am I able to share a business logic layer seemlessly between the two presentation layers or is there anything I need to watch out for. I'd really like to not have any duplication of business logic, so any advice would be more than welcome.

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