Change/Edit A TextBox Or MaskedTextBox: How Do Keep Track Of The Previous Value
Dec 21, 2010
I have an officecharge textbox in which I specify how much I'm charging the customer for a specific service. If the user changes the officecharge value for that customer I would like to keep track of the previous value to then compare
it to the new value to then set a boolean variable true or false accordingly. I would like to fire/trigger this segment of code everytime the user leaves the OfficeChargeTextBox (after it loses focus) so that it can compare the final value entered with the previous value and then decide what to do based on whatever login.applies from that point forward.[code...]
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Jun 24, 2011
In my form, I have textbox + combobox to enter datas which are saved to ms access. I have search option too. Also i have DataGrid to show the result of the search. What I want now is, 1. To show the search result in the textbox/combox as well (I already am able to make the result show on datagrid)2. When there are multiple result showing on DataGrid, if i click on a particular result on DataGrid, let the textbox/combobox automatically loads the details of the one i clicked.
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May 25, 2009
I'm building a small program and I have a numbers only textbox where its content need to be higher than 1. So what I have is a messagebox pop when the text change and its lower or equal to 0. What I'd like to do is have the text changed to what it was before the number was changed to <= 0.Here's what I have for the control:
Private Sub txtDelay_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtDelay.TextChanged
If txtDelay.Text <= "0" Then
MessageBox.Show("Delay must be atleast 1 millisecond.", "Delay Error")
End If
End Sub
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Jun 16, 2010
I find this property useful but cannot find a direct replacement for it in vb.net. Is there one?
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Sep 21, 2011
After experimenting around with DevExpress controls and adding them to my form, Custom mask do not seem to work on the MaskedTextBox. If I place a custom mask and debug, I get a null reference exception.
It seems to be the maskedTextBox's mask property that is doing this. I have tried setting the mask through design and by code. However, neither way works.
My question is, is it possible to use a TextBox as a maskedTextbox? To be able to format it? I need the user to enter in hours, minutes, seconds like hh:mm:ss or 00:00:00.
Here's the error I get:
"NullReferenceException was unhandled. Object reference not set to an instance of an object."
[Code].....
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Jan 22, 2011
In COBOL, I read a value (a currency amount with 2 decimal places, for example) via a picture clause (and a screen section, of course), like:
WORKING-STORAGE SECTION.
01
VALUE-TO-READ PIC ZZZ,ZZ9.99.
...
[Code]....
The tricky part here is, whenever the decimal sign key is pressed, the input procedure understands that the following number is to be displayed to the right of the decimal point (not left).
Now, I'm trying to do this in VB. Unfortunately, my all attempts failed with MaskedTextBox.
Do I have to hardcode this procedure in my program, or is there an easier way to get around this?
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Sep 10, 2009
i have a form in design view. with faremaskedtextbox and a extra_farecombobox,could anyoneplease tell me the vb code to addfaremaskedtextbox +extra_farecombobox together anddisplay result in another total_faremaskedtextbox.so basically i wanttotal_faremaskedtextbox to add the two numbers that are put into each faremaskedtextbox and extra_farecombobox. and show the result in total_faremaskedtextbox.
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Jan 16, 2010
How to create a new textbox every time previous textbox.text is entered?
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Mar 25, 2011
I have 3 TextBox control, 2 is for keyin data and 1 is for Display data,
[Code]...
What I want is to display combine input data from TextBox1.Text and TextBox2.Text to TextBox3.Text I mean keep any previous data input in same TextBox and saperate it using a comma (,) or (;) for combination I am using (@)
Example: In TextBox1.Text I put 200 and TextBox2.Text 2000... Click button Save and I want it to be display in TextBox3.Text as 200@2000 and again I Enter 500 in TextBox1.Text and 5000 in TextBox2.Text Click save button and I want it be display in TextBox3.Text as 200@2000;500@5000 which is 200@2000 is the first input data... and it continue as many as it can.
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Nov 17, 2010
I am writing a class library to interact with a domain Active Directory. In my object model, I have the following:
Domain;
Organizational Unit;
Group;
User.
In my Domain object, I have an Entries property and an Add() method.
public class Domain {
// The ReadOnlyDictionary<TKey, TValue> is a custom wrapper over an IDictionary.
public ReadOnlyDictionary<string, IDirectoryEntry> Entries { get; }
public void Add(IDirectoryEntry entry) {
Entries.Add(entry.Name, entry);
[Code] .....
For your information, I implemented the INotifyPropertyChanged interface to ease my life, but I don't seem to find a way to make it work the way I want. Perhaps am I not doing things right somehow, as for the location of different methods, I don't know. How can I make my Domain aware of a change that occured within one of its Entries, so that the TKey value is also changed? That is wanted because one could possibly add an entry, change its name meanwhile adding a new entry with the "old" name of the actual within entry, and cause a conflict, etc. In the end, causing the test to fail. But I'd like to make it pass like it actually is. Is there another better approach or workaround?
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May 25, 2011
i have one textbox and two buttons.button1 name as prev,button2 name as next.The textbox contain current date.If iam clicking next button textbox will show the next date.if iam clicking prev button textbox will show the previous date.
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Feb 22, 2012
Im using visual studio 2008, i have created 2 webforms frm1 and frm2,,,i have a button in frm1 which i would like it to onclick populate textbox values to the other form(frm2)...
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Oct 27, 2010
I'm writing code some that is supposed to be creating a list of objects pulled from a data base. The list returned has every item containing the value of the last one added. When I debug the code is VS2008 I can see each time that the list.add is performed every other item in the list being changed to the one just added. Here is the code I running. The line containing ListAKAs.Add(itemAKA) is the one where the entire list of objects is changed to be identical to the one just added.[code]....
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Apr 24, 2011
yeah im very far with the project right now just a day or two probably of completely finish it, but im so far that itll break alot of things if i change a textbox i have for a maskedtextbox, besides there are some things that the normal textbox does a bit differently than maskedtextbox, ive searched around the net and found nothing about this in vb express, probably because everyone uses maskedtextboxes instead xD
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Jun 13, 2009
How can i show all my messages in a textbox,without deleting the previous message?
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Jul 16, 2011
In Datagridview, Set as DatagridView1.ReadOnly=True,
Dgv1.Rows.Add()
When i tried to add a Row, it is copying previous Row data to new row,and also blank the previous row, why?Like Insert Row, Why...?
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Apr 28, 2011
how do i add text to a multiline textbox without erasing what is already in there?
Lets say the textbox already has...
"Visual basic is "
and then i want to add the word "fun" to the textbox without erasing "Visual basic is "
after adding "fun" i want it to read.... "Visual basic is fun"
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Nov 30, 2011
I had to switch computers at work to a laptop. My co-worker was using this laptop and we where both working on the same project using CollabNetSubversion to update the VB project. Well he left and reformatted his Laptop and now I am using it.
I took the VB project from my PC to the laptop and now every change I do won't show up if I run the program.I can completely commit out code for a form and it still runs!My trial version of VB ends in six days so I can't use the PC anymore.
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Jan 26, 2012
how to save again, after I edit cannot save again.... !The changes you reguested to the table were not successfull because the would create duplicate values in the index, primarkey, or relationship.
Private Sub cmdSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSave.Click
Try
Dim save As String
[code]....
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Aug 4, 2011
is there a method of setting up my datagridview to show me textboxcolumns until editmode is entered? At which time I will swap some textboxcolumns for bound comboboxcolumns. And at the end of validation/exit edit mode I can swap back?
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Oct 25, 2009
-Add the Edit menu to change the Font font format
-Add Color to the Edit menu to change the font color
-Add a message "Form to $ disave yet. Will it be saved? "If you choose Close and there is not yet form disave children. If you selected YES then the Save dialog appears. ($ Is the order form child)
-There combobox / listbox on the left, typed characters and their ASCII code it will go into combox / listbox it. Characters that have entered may not be entered again.
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Sep 12, 2011
Public Class Form1
Dim conn As String
Dim ds As New DataSet
Dim da As New OleDb.OleDbDataAdapter
[code]....
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Jul 11, 2010
I'm trying to change the values of some of the controls in the ASPxGridview Edit Form, however they are not changing. It seems to be resetting? How can I do this and in which event would I do this in?
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May 17, 2012
The coding will works if the data type of my primary key is integer.but when i try to change the primary key in string data type i cant delete oe edit. below is my coding for that 2 button that is working.[code]..
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Dec 26, 2010
I want to create a page name "parameter link" where the user can edit and change the value of the threshold. For now, what I have is, all user can change the threshold permanently. What I want now is the user can only change the threshold value during the session only, and the value will reset back to the previous value when the other user login. Only admin will have the privilege to change the value of the threshold permanently., but I don't know where to start.
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Sep 14, 2009
I'm using the following code to position a textbox over the selected listview subitem
Code:
dim selSubitem as ListViewItem.ListViewSumItem
Private Sub ListView1_MouseDoubleClick(......).....
[code].....
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Nov 1, 2011
in row or column..particular(one cell) should edit and change the information...and save to database...
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Apr 27, 2010
My application has to do a lot of work when I press as single button. When he is doing this he got to changes sometimes a few tings in a textbox. Sometimes the calculation can take more then 10 - 15 minutes, is there any way to make it doesn't say not responding? And you are able to work further in the program. I did try backgroundworker but I'm not able to edit the textbox.
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Feb 20, 2012
I have one DataGridView named dgv.dgv is pretty much a plain gridview. No bounded data. No columns added. It's basically empty.I also have one DataTable named dt.I add rows and columns manually into dt.
dt.Columns.Add(New DataColumn("TexBox", GetType(String)))
dr = dt.NewRow()
dr("TextBox") = String.Empty
dt.Rows.Add(dr)
I then simply set dgv datasource into dt.
dgv.DataSource = dt
dgv.Refresh()
I then set the value for this particular cell.
dgv.Item(0,0).Value = "xxx"
Now when I run and execute all those commands. I happen to retrieve the gridview with that value indeed. The "xxx" cell appeared and currently it's uneditable.What I want to achieve is:Allow this "xxx" cell to be editable. Preferrably if it can be inserted into a TextBox control inside the cell.
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Mar 30, 2011
I want to be able to display a textbox but not allow the user to edit the content.
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