Get Total To Update Correctly In .net (using Textchanged Event)?
Sep 11, 2011
What i have in a text box that is the discount. The text box talks to the label as you type and updates it accordingly The problem is that once the discount_rate.text get to 10 or above the discount is off by 5 cents and increases as the number goes up..
Private Sub discount_rate_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles discount_rate.TextChanged
Select Case radio
Case "one"
If discount_rate.Text = "" Then
I'm trying to validate a few things in a form I'm building. It has a datagrid with clients info (taken from an access database) and a few textboxes where the user can type some search criteria. The thing is that those same textboxes are used to add new clients to the database and to modify a client's information if one from the datagrid is selected, so I made it that the buttons to insert and modify clients are disabled on load and thenevery time the text on a textbox changes ("TextChanged" event) they become enabled. So far so good. But then I wanted to make it so when a client from the datagrid is selected both buttons become disabled again until the text on a textbox changes (to make sure they're adding a different client and not the same one that was selected).
I tried using the CellClick event from the datagrid to disable the buttons, but since every time a client is selected from the datagrid the info is shown on the textboxes, this triggers the TextChanged event too, and the buttons become available.So, is there a way I can tell the TextChanged event not to be triggered when the CellClick event occurs?
I'm in a beginner programming logic and technique class that also teaches us VB, and I'm working on a program that is to simulate total theater revenue, that asks for the number of tickets sold in a particular section and then displays the amount of sales generated from that section. It needs to validate that the total number of tickets sold is not over the maximum seating in that section.[code]
1) I have a warning that "Variable 'section' is used before it has been assigned a value. A null reference exception could result at runtime" in line 18.
2) Regardless of the changes I've made, I always end up getting "0" as my end result. I'm actually supposed to use the toString currency format function when getting my end result, but that was mixing me up so I figured I'd at least make sure the output is correct before I fix that part. I thought I was on the cusp of having this working but I think I'm confusing myself more and more the more I mess with it.
I want to set the TextChanged event in NumericUpDown box,so that when you press a key, it instantly fires the textchanged event.The default ValueChanged event of the NumericUpDown box does not instantly fire the ValueChanged event. You need to first press the Enter key after you enter a number.And I read somewhere that NumericUpDown box also has a TextChanged event.How do I set the TextChanged event in the NumericUpDown box?
How can I bypass the TextChanged event if I populate the textbox during loading?for exampleWhen the VB Win form application starts it loads several text boxes with deflt information.thus firing the TextChanged event. (which I don't want to happen)
i have one project any one textbox.i want to get the textbox value without textchanged event how to get the textbox value. means when i change the textbox value then the text changed event is fired but when i clicked one another textbox at that time i want to get the textbox value in vb.net
I need to know this because I am in a situation that I cannot find a alternative. I am using MaskedTextBox and has a Mask of "__/__/____". Obviously, It's a date format. Now, I cannot get if the MaskedTextBox is string.empty because it is not an empty. I cannot use "If MaskedTexBox.Text = "__/__/____" then " condition also because It never captured. If I used MaskTextBox.MaskFull = false, It gives an error on creating form. So I came up with an idea that would subtitute to TextChanged Event.
I was wondering if there's an easy way to make a cell textchanged event for a datagridview, like you have the textchanged event for textboxes, an event that gets triggered everytime the user press a letter/number/symbol/backspace/space, so i can check in that event if the datagridview has changes and whether i should enabled my save button to save the changes made.
Or is there a better way to check whether i need to enable my save button?
I have a Textbox on my application that recieves data from another application via a sendmessage call from the other app.
I can see the data being entered in the textbox but the TextChanged event never fires when the text changes. I need to process the data that is sent but since the event does not fire I'm kinda stuck..
In my asp.net application, i am using a lookup to enter data to a textbox.For making lookup i have used jscript.I have a button for this lookup from which i am entering data to this textbox.so, i am not entering values directly to the textbox.After entering values to textbox, the textchanged event is not working.What could be the reason?
I have invoice form bound to a bindingsource and bindingnavigator. In the form I have unit price, quantity and total textboxes. The total textbox text property is set to total.text = quantity.text * unitprice.text in the textChanged event of both quantity and unitprice text boxes. The result is displayed in the total textbox. But when i hit save button on the bindingnavigator it is set to null and not saved to database. [code]When I used msgbox to see the value of total textbox before bindingsource.endEdit() it is the correct value. but after the code bindingsource.endEdit() it is null. I checked the databinding property and it is correct. What is the problem.
Protected Overrides Function ProcessCmdKey(ByRef msg As System.Windows.Forms.Message, _ ByVal keyData As System.Windows.Forms.Keys) As Boolean Dim handled As Boolean If keyData.Equals(Keys.Enter) Then handled = TypeOf Me.ActiveControl Is ComboBox Me.SelectNextControl(Me.ActiveControl, True, True, True, True)
I am having a problem getting my prgram to reclaculate upon a Textchanged event. it works fine on LostFocus, not sure what I am missing here is my code..[code]
I am using an update panel and when I click a button it will update all the panels. updapanel1.update() is very simple, but my data is not updating unless I hit the button twice. My gridviews shows data for a selected user, and then all the grids reflect that users data. works fine all the update panels work for the gridviews. Now for somereason when i try to do a row count and update the panel with the summary, it does not work, i get either the previous users summary or if i hit update again for the same user i get the correct data.
I have a TextBox control being used to capture an IPAddress from the user.I want to be able to allow them to change that IPAddres at which point the new value will be utilized by the appropriate .NET socket class to ping that new address.What other event is used with TextChanged to indicate that the user is done making changes to the TextBox. The Leave Event?
I am developing windows application in vb.net.in this project i want to set the Richtextbox height according to the content in that richtextbox. For this i want to call the Richtextbox textchanged event on button click Here is my code but i got error
on button click RichAll_KeyPress(sender, New KeyPressEventArgs(e))
I'm not sure if this is possible, but if someone could explain as to why it might be happening.I have a form which has some textboxes: txtDateFrom txtDateTo Where the user would enter the date from and date to that he would like to search for. I've given these textboxes default values in their properties: e.g. txtDateFrom's text is 'Date From' and txtDateTo is 'Date To' . I've then added a onclick event to each of these text boxes informing them what format they need to enter the date :
[code]...
This method however seems to be invoked as soon as the form is opened, does putting a default value for a textbox invoke textchanged? surely not?
add a code to handle the TextChanged event of my Textboxes to clear the Result box.
Private Sub btnCalculate_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click txtResult.Text = txtRate.Text / 100 * txtAmount.Text * txtYears.Text End Sub
Windows forms Application. VB .NET 4.0 In my application I have a global boolean variable that keeps track of when changes are made and when they are saved called changesSaved. On closing even it checks the value of this variable before closing the window.. I am using textchanged event to automatically change the value of changesSaved to FALSE when text is changed.. Problem: The group box items are being populated dynamically so the user can edit the values or simply just view them. This dynamic population is causing the textchanged event to fire because the program is changing the text value of the box to put the values in that are stored in the database. The textchanged event should not fire unless the user him or herself enters a value or values in the text boxes..
Is there a way to specify the source i guess you could say for the text changed event or another way so that it will only fire when the user inputs information.??? Functions are as follows: The first is called by the load event to place the values in the box... The next one is the one that is being called as a result of the first one and is also the one that is causing the problems.
I'm facing a problem while updating data in a database through datagridview. I'm changing the cells using a for loop and then updating db using below code. All data rows get updated but 1 (the last one).
I use the following statement to position which row to update; Dim salonToUpdate = (From r In db.Salons _ Where r.StoreID = storeID _ Select r).Single() If fileDate = #1/1/1900# OrElse fileDate = Nothing Then SalonToUpdate.LastDownLoadDate = TableDate [Code] .....
I've double checked to make sure none of the dates are invalid or null, but when the bolded statement executes, the following sql runs through the trace: exec sp_executesql N'UPDATE [dbo].[Salons] SET [LastDownLoadDate] = @p0 WHERE 0 = 1',N'@p0 datetime',@p0='2008-01-04 00:00:00:000' Of course it's going to fail if LINQ is passing in where 0=1 every time. Shouldn't it be using some unique row identifier, (in my case, the salon id), to update the specific row?
In my application, I have a call for an update to a table on my database. I know that it is executing because I get a 1 returned when checking the number of rows affected but when I look on the DB the value is not updated - I have refreshed and still no update. Here is the code, taskgrp_template is type bit and taskgrp_id is type integer. Id is also set to the correct value, as the result of my tracepoint - results listed below code.
mycmd.CommandText = "UPDATE p2_taskgroups SET TASKGRP_template = 1 WHERE TASKGRP_ID =" & id rowsChecked = mycmd.ExecuteNonQuery()
Tracepoint result: the value of id is 55 and the value of templateCheck is 14 the number of rows affected was 1
Is there a way to find out if the "TextChanged" event is fired because the user is typing into a textbox or the programmer called myTextBox.Text = "something"? I don't want to react when the user is typing each letter into the textbox so I am using the "Validated" event to catch when the user is done so I can react. The problem is I don't have a way to catch when the programmer does "myTextbox.Text = "something". The only way I know to catch changes there is to use TextChanged but then I don't want to be reacting when the user is typing each letter into the textbox.
I cant seem to get VB to focus on a textbox correctly at the moment I did TextBox.focus() in the load event but still a button keeps grabbing focus anyway.
I dont know how to get the program to do the total calculation after i delete an item from the listbox. Basically i have 2 forms. One is the shopping item list and the other is the shopping cart.
Here is my codes:
Public Class Form1 Public totalBuy As Single Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
I'm having some major issues with this little booger. I will supply what I've tried, but let me explain what it should do first.
Upon the text change event, if the item number is found in the DB, it should add it to the list. Then, take the 7th sub item, and place it on a label. Each time a new item is added, the cost's should add together to give me a total. Simple enough right ?
CODE:
This is a huge mess, I'm very tired and not real sure how to do it. But the item is adding twice for some reason, sometimes after I've added it one time (appears twice) and add it again, it might add 4 times, or 5. And when two items are in there, the cost displayed on lblPrice is 4x as much as it should be. Can anyone point out where I'm all screwed up, and maybe suggest a different way to go about it ?
