How To Detect Updated Textbox With Linq
Apr 19, 2011
If this is a stupid question, then let me know. I can't just figure it out.First of all, this is my question. How do I detect the changed value on those text boxes?I have an idea that I create a another string values that have the original values and compare them right before saving or form closing event. This sample just have 3 text boxes, but I have 50 + text boxes on my one form. I can do it that way, but that is not really smart idea.Can I use abcDB.SubmitChanges() to detect any data changes on text boxes?
Dim sqlQuery = (From obj in abcDB.HelloWorld
Select obj.Fname, obj.Lname, obj.PhoneNumber).FirstOrDefault()
me.textboxFname.text = sqlQuery.Fname
[code].....
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Dec 14, 2009
I am trying to update a table using LinQ. Though records are getting inserted, for some reason they are not getting updated.what can be possible problem
Dim db as new empDataContext
Dim emptable as new employee
if update then[code].....
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Dec 28, 2010
[Code]...
I have the following records in the table student(see in fig 1). I am trying to update the Name of student whose Roll no =1. But Record is not updated in the database,
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Nov 16, 2011
I have an initialize function that loads data into my textbox NameTextBox, and then I add an "s" to the name. I then click the Save button that executes SaveButton_Click when debugging the value for NameTextBox.Text is still the original string (FirstName) and not (FirstNames).
Page_Load(sender, e)
Info = GetMyInfo()
Initialize()
[Code]....
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Nov 30, 2011
I got this form with 2 textboxes and 2 buttons, when clicking each button, the corresponding textbox should show 1, problem is none of these textboxes show anything
here's the code in form1
Imports System.Threading
Public Class Form1
Dim mc As New mycl
[Code]....
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Apr 20, 2011
I tried to increment a value as long as I press a button. The incremented value is connected via binding to a TextBox. The problem occures when I update the underlaying integer. I get an exception that another Thread owns it.
<Button Name="Up"
Content="Up"
PreviewMouseLeftButtonDown="Up_PreviewMouseLeftButtonDown"
[Code]....
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Dec 13, 2011
how can I detect if press Enter in the Textbox Change event and not in Textbox Keypress?
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Jul 1, 2009
part of my code is in below
[Code]...
I would expect to see the path.Path include the new record, however, I also notice that tempnextgen also include the new record. Can anyone help me out on this issue? Why the tempnextgen got updated as well, how to prevent this unexpected operation?
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May 29, 2009
The only way I know of is awkward:
'check for empty return
Dim count As Integer = (From s In myEntity.employee Where employeeID = myEmployeeIDVariable).Count
'If there is a record, then process
[code]....
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May 7, 2012
The Textbox_TextChanged event fires when a key is pressed or when text is pasted while cursor is in a text box.
Is there an event that fires on Textbox1.text="NewText"? How do I detect this?My reason for doing this is I would like to reformat text property automatically on assignment rather than do something like textbox.text=myreformat("Newtext").I can put code in validating or validated event but then I'd have to force focus/lostfocus to trigger one of those events.
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May 11, 2010
I'm using VB Express 2008 and I want tto write a simple code.
[Code]...
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Nov 19, 2010
I am new to Visual Basic and i am using VS 2008. I have a form with multiple (7) text boxes. What i would like to accomplish is basically, when i click on textbox 1 a predefined message would load to label1 and when i click on textbox2 label1 would now displays a different pre-defined message and etc... I've tried using the "focus" parameter of the textbox but it doesn't work. So i am thinking of using the cursor as a way to solve my problem but i don't know how to work with it. I found a very similar thread titled " Detect when the cursor is in a textbox/typing in webbrowser?" on this forum but i don't think it applies to my situation.
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May 7, 2012
What I have: 1 OpenFileDialog, 1 PictureBox, 2 TextBox's This is what I got so far, but I'm just stuck on how to have the width of the image automatically detect and put the images width in pixels in TextBox1, and the height in TextBox2.
Public Class Form1
Private sizew As Integer
Private sizey As Integer
[code]....
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Jan 5, 2012
I have a TextBox with a list of filenames in it. The user is able to change these file names, but I don't want them to enter invalid characters, such as slashes or question marks.
I've tried two approaches, but they are not satisfactory:
1. Detect the key pressed with the KeyDown event:
Use e.KeyValue to detect keys like Keys.Oem5 (= backslash), then use 'e.SuppressKeyPress = True' to suppress the key.Problem is, with different Keyboard layouts, The Oem5-key isn't always a backslash.
2. Filter the text:
Use the TextChanged event and do a Replace("", "") on the text for every invalid character (there's 9 of them).Of course this will create 'lag' with every keystroke, especially if there's a lot of text. Also the text-cursor and scrollbar will jump back to the top-left when using Replace.
In short: I'm looking for a way to detect the character that is being entered and suppress or remove it when invalid.
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Sep 29, 2009
How can I detect if a text is pasted in a textbox (and not typed?)
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Mar 28, 2010
I'm using a custom webbrowser to display a special intranet for my company.I need to be able to display a custom keyboard whenever the user can type in the webbrowser. So if they click on a textbox within the page to type, this custom keyboard appears.when the user is in 'typing mode'. I thought maybe checking when the cursor changes to 'ibeam' which is the typing cursor? How might I do that, or is there an easier way?
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Feb 26, 2011
I want to detect when the user has changed the content of a Textbox.
The following does not work for me, because: When the user navigates through the database (using my navigation buttons), the textbox is also changed, but NOT by the user making input. I would only like to know when the user EDITED the Textbox.
Private Sub mskStudentNumber_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles mskStudentNumber.TextChanged
If Not Movement Then '' If not navigation
[Code]....
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Jul 23, 2011
When you you right click on a textbox the context menu is automatically open.
I have put a textbox inside a relatively complex user defined user control.
The annoing thing is that when I try to open the context menu with a rightclick the context menu is open but it shuts down soon after.
I tried to see if the mousedown or mouseUp of my (preview and not) usercontrol could interfere with this but i did not find anything.
Is there any trick that I can use to see what forces my context menu to close soon after is open?
Is there something in Vb2008 that allows me to see the steps widthout using breackpoints
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Feb 28, 2011
I have some textboxes bound to a bindingsource and bindingnavigator.
I want to detect when the values have changed and prompt the users to confrim if they want to update.
When the form is first initalised and when then binding navigator moves to the next record the text_changed event fires on textbox where I have a boolean to determine if things have changed.
Is there a way to set my boolean only when valid data changes have occured or a better way to detect if things have changed
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Feb 6, 2012
I'm working on a Form that contains a datagridview and textbox, I need the datagridview detect any letter of the alphabet or numbers, then select the input and send the key pressed to input.
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Mar 25, 2011
I have this LINQ query lq_customer_product which has something like this [code]I had a combo which contains the product_name get it from lq_ customer_product, means the combo has 5 item in it.when I select an item from the combo (let say i select prod1) the following should occur:[code]
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Nov 15, 2011
I have a question regarding LINQ 2 SQL and data integration with textbox:I have one textbox and button on my form, one stored procedure and LINQ 2 SQL class file in my project,I want that when I hit button, my store procedure run the SQL query and show me the result in textbox.I am using VB 2008 and Visual Basic for programing.
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Oct 14, 2009
I'm using visual basic 2008 express edition by linq to sql for my database operation such as edit records. I did not use any sql server but I'm just using the built-in sql server within the visual basic 2008 express. I tried to revised the codes, no error in syntax but there's an error at runtime and it pops-up a window message saying its error message. What I want is to edit the records which were retrieved from the database into the text-boxes and when you click the button5 whatever the new value on the text-boxes should replace the previous one.The Account field is the field in my Table1 in memrec.dbml which I set up for primary key is true and the rest of the fields are false in its primary key.[code]...
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Oct 14, 2009
I'm using visual basic 2008 express edition by linq to sql for my database operation such as edit records. I did not use any sql server but I'm just using the built-in sql server within the visual basic 2008 express. I tried to revised the codes, no error in syntax but there's an error at runtime and it pops-up a window message saying its error message. What I want is to edit the records which were retrieved from the database into the text-boxes and when you click the button5 whatever the new value on the text-boxes should replace the previous one.The Account field is the field in my Table1 in memrec.dbml which I set up for primary key is true and the rest of the fields are false in its primary key.The code below still found an error when you run the program and it pops-up a window which says:
NotSupportedException was unhandled - Sql server does not handle comparison of NText, Text, Xml, or Image data types.It highlights a yellow background on the line:
db.SubmitChanges()
These are what I see on each field's property on Table1 in memrec.dbml property window:
Access - Public
Type - String(System.String)
Server Data Type - Text[code]........
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Aug 13, 2009
I have a LINQ to SQL DataContext with all my tables and all my stored procedures in it. Let me first start off by saying that we are upgrading our project from an access project to a WPF project. So in the Access project you could set a forms datasource to a stored procedure and edit and add new information. So in my WPF project on the page load I call my stored procedure to return an ISingleResult and then call a function to set the binding on every single textbox on the form. One is there an easier way to do this and two what if I want to add a new record since the textbox's are binded to an ISingleResult?
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Mar 22, 2011
must stop the user from proceeding if the textbox is null,if the textbox has only spaces in it.i tried . trim but that doesnot work, still spaces are excapted as valid characters.
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Oct 21, 2009
I load a DataGridView (VB.Net, VS2005) using the code below. The save logic works fine for manual edits oh the cells.However, I run some code that updates a Status column in every row then I call the same Save logic. All rows execpt the first row are updated! I am updating the Datasource (dvCerts)Ah.... I just tried changing the CurrentCell to 1,0 instead of 0,0 and now the data saves OK.
Load_...
daCerts.SelectCommand = New SqlCommand("SELECT * FROM PERP_ARB_Certificates", conPERP)
Dim cmdBldr As New SqlCommandBuilder(daCerts) ' used for grid save
[code].....
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Sep 22, 2010
as os are being updated does windows updates the api also ?is yes what are the new windows api provided by microsoft and their documentation for windows 7
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Jul 21, 2010
I have a picturebox that is supposed to grab an image from the clipboard, which contains the latest image captured from a webcam. Portion of the codes are as follows:[code]...
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Mar 15, 2012
[Code]...
The table is not getting updated.
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