Enable Tab Out From Empty Texbox When Adding New Data In VB 2010?
Jan 27, 2012
I am using visual studio 2010, service-based database. I created a simple table and created an edit form for that table. But when I save a row and then clear the text of a textbox (which holds a decimal value), it simply does not let me tab off the text box or save it. I put a ErrorProvider to see whats going on. It says "Input string was not in correct format". But I allowed this column to be null in my table. So how do I fix this error. And by the way, it does not happen for all text boxes.
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Jun 14, 2010
I have the following code that connect to my SQL Server and retrieves data. Then it populates my listview with the data.
However, how can I populate my textboxes with the data from my connection?
Dim cs As String = "Data Source=DELLCVSERVERCAPITALVISAS;Initial Catalog=CapitalVisasCRM;Integrated Security=True"
Using con As New System.Data.SqlClient.SqlConnection(cs)
[Code].....
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Jun 12, 2009
i am new user of Dot net and i want to show table data into a textbox from data reader but i dont know how to asing value to textbox.
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Mar 10, 2011
is there a data type which i can use as a Url to open a file in my computor . For example i would like to search for a file name in my data base using different critera. But not just being happy to read the URL in a text box . I'll like to click on the data and open the file.
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Jul 26, 2010
I did populate data from db into the combo box and display it into the text field .
Below is my code :
Imports System.Data.SqlClient
Public Class MPEJobEntry
'declaration of connection string
[code]....
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Aug 24, 2010
I got a textbox containing eight characters.
I also go 8 seperate textboxs "txtPass0 , txtPass1" etc.
i need to know how i would split each character of the texbox into the eight separate textboxes
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Jan 30, 2012
Im trying to make the "Next" button .enable = False if the .image in the picbox is empty. But for some reason its failing me >.>
Private Sub picBox_ImageChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles picBox.ImageChanged
If picBox.Image = Nothing Then
[Code]....
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Feb 26, 2012
I am trying to write a class to implement search as you type. e.g. a form has a textbox and a listbox. Each time the textbox text changes, the list is the list box is filtered accordingly. E.g entering "ha" in the textbox would cause the filtered listbox to display 'I plan on implemtneting a sayt class.(see example below)
The thing I am having problems is working out how the two controls will 'talk 'to each other.
e..g when the textchanged event fires for the textbox, how does a sayt object 'know' that it needs to refilter the listbox?
[Code]...
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Jan 3, 2011
I need to give the user an ability to add rows. i can't figure out what control to use to accomplish this. for example
first row with empty text boxes is always visible:
[first name] [last name] [middle name]
add more button
[code]......
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Jan 6, 2012
This works:
DataGridView.Rows.Add("Bla Bla Bla", value1, value2)
But if I do:
Dim newrow As New DataGridViewRow
newrow.SetValues("Bla Bla Bla", value1, value2)
If Not value1.Equals(value2) Then
[Code]....
the entire row is empty.
Why is the row full of empty cells?
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Oct 5, 2011
I am wondering if anyone else has experienced any issues with adding a data source to a VB.NET 2010 solution using the 'Add New Data Source' wizard. I am getting a very odd behavior when i add the data source, I see a .xsd file is added in my solution explorer but I do not get a data source listed in the data source view. In short, it will add a dataset to the project but will not add an entry in the project data sources. I realize I can code to get the same results but purely out of convenience I would much prefer to just use the wizard and the corresponding table adapters it generates as I always did.
By the way, a google search shows that many people had similar issues in the 2005 version but their issues involved trying to use special characters in the project path (i.e. 'C:My ProjectsR & DMy Tool. I do not use any special characters in my project paths and yet am still experiencing this issue.
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Sep 28, 2011
what is the most robust method for adding a empty row (to select "nothing") to a ListBox?
Dim List = Enumerable.Repeat(New TABLE With {.Text = "", .ID = -1}, 1).AsQueryable().Union(From t In mainctx.TABLEs)
ddlMangelKategorie.DisplayMember = "Text"
ddlMangelKategorie.ValueMember = "ID"
ddlMangelKategorie.DataSource = List.ToList
But this has some drawbacks:wordy must explicit write the Type (TABLE in this case), so i cant wrap this in a function have not found an solution, which works with anonymous types I.e. if I add a From t In mainctx.TABLEs Select Text=col1, id=col2 to the query, this method does not work anymore.
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Oct 19, 2010
I have a calculator like program which has a function to export a string ('StringBuild') to notepad .The process start OK but it has a funny problem. When I run Process.Start it also keept running a sub that I had linked to one of the calculator buttons.I played around with the code but now it runs a hyperlink that I have on the calculator. I even tried adding an empty, hidden, button as the last item on the tabindex to see if that would work but it hasn't.
Process.Start("Notepad.exe")
SendKeys.Send(StringBuild.ToString)
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Nov 1, 2011
I have linked VB to my sql server and all my tables and data load correctly in VB.I drag and dropped my table in "detail" view and then debugged the program, little did I know, when I tried to add a new instance of data into my table I literally have to enter the primary key. I am trying to figure out how to set the "STU_ID" (PrimaryKey) to auto-increment off of the last row of data on my table.
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Mar 29, 2011
I am adding data to two listboxes: listbox1 and listbox2. Now i want so sort Listbox 1, witch i can do with listbox1.sorted = true. But then listbox 2 has to be sorted the same way. (The data has to be matched) How can i do this?
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Jun 19, 2009
I want to allow the user to enable or disable a textbox by clicking either a button (enable) or the reverse. (disable) if the user clicks the enable button the textbox should receive the focus.
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Apr 23, 2011
How can I enable the encryption of an WCF (Windows Communication Foundation) Service with VB.NET? Is it enough to add a certificate to a service an set <security mode=""> to "TransportWithMessageCredential"? Or is there any other settings needed?
[Code]...
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Mar 11, 2010
am developing software using sql database. i want an sql statement that can enable me retrieve data which for example has same surname,save them in an array or dataset and navigate through them.
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May 1, 2012
How would I enable a command button if 3 out of 10 text boxes contain any data?
So far in the load event I have Button9.Enabled = False
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Nov 28, 2011
I am using VS 2010, VB.NET and when I drag a chart object to my form from the toolbox, no wizard appears. Do I need to enable wizards in VS 2010? or is there another reason the wizard doesn't automatically appear?
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Mar 17, 2011
I need to read an xml document from a database record into an XDocument object in order for it to be deserialized. So that the deserialization will work, I need to apply a specific namespace to each of the level 1 elements. So XML looks a bit like this:
[Code]...
How do I prevent the blank/empty namespace being added to each child element of the element to which the required namespace has been applied?
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Jun 10, 2012
I am trying to display an usercontrol(has several panels one on top of the other panel) on tabpage. I am using below code to achieve this.
[Code]...
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May 4, 2012
I'm adding labels at runtime to my form with a tag. Let's say I have 3 labels with the tags, "1", "2" and "3". I'm adding the tags by counting the labels + 1. When I remove a label with tag "2" from the form there are only 2 left. When I add a new label it will add a new tag "3", but that one already exist. So my "solution" isn't a very good one Although tag "2" is free, I want to give it "4". Any thoughts on how to code this properly?
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Dec 16, 2010
So I just spent the last 4 hours trying to find out what was wrong with my code, just to find out that there's a bug in this version or I just don't have enough knowledge of VB2010 (I'm coming from VB6, this is my first program on 2010)I removed the rest of the code just to point out the problem, here it simply tries to enable the Timer1 when you receive data in the SerialPort1
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
If Me.Timer1.Enabled = False Then
[code]....
After this I found that the code inside the Timer1 didn't run when the 100miliseconds passed, so I added a msgbox to see debug.
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
If Me.Timer1.Enabled = False Then
[code]....
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Oct 22, 2010
I have a listview control (lstBasket), and I want to only enable a button when the user selects an item.. If there is no item selected then the button (cmdRemove) is disabled. My program is required to remove/change the item when they select it and clcik remove. Either that or a try and catch, that will stop it from throwing errors when there is no item selected.
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Apr 6, 2011
I am creating a project in VB.NET in which one of the reports require that the name of employees should be displayed as column names and whatever work they have done for a stated period should appear in rows below that particular column.Now as it is clear, the columns will have to be added at runtime. Am using an ODBC Data source to populate the grid. Also since a loop will have to be done to find out the work done by employees individually, so the number of rows under one column might be less or more than the rows in the next column.Is there a way to create an empty data table and then update its contents based on columns and not add data based on addition of new rows.
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Feb 16, 2012
I 'd like to enable the user to apply a custom filter to a System.Data.DataTable.At the moment I have a very simple function like this:
Dim result = dataTable.Select(txtUserInput.Text)
With the filtered results I'd like to do further operations(e.g. Database Update/Delete).Is an sql injection protection needed or is the "Select" function secure?
//Edit:Can the "select" function be abused to manipulate any data in the datatable, execute code, ...? If the only danger is that this function can return to much/to less data there is no problem. But if the data in the dataset gets corrupted it's a real problem.
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Apr 26, 2010
I have managed to format a text box to be formatted to two decimal places, and to only accept numbers.Only problem is i need to allow the backspace so that if someone types something wrong, they can backspace and type the correct number
Private Sub txtCAmount_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtCAmount.KeyPress
'Allow only numberical input plus decimal.
Dim allowedChars As String = "0123456789."
[code]....
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May 5, 2011
I have a Customer JSON object created which has value as below:[code]I need to get this data in the Handlers/CustomerHandler.ashx to do some DB operations.[code]
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Oct 25, 2011
I am trying to bind XML data into a gridview, after clicking the 'ButtonSaveToDataBase' button, the method will begin to read data from my gridview and load it into an array of my serializable class type and after that serialize it and finally store it into a XML type field in my SQL. The problem is When I call BindData() at the end of the serialization, it reads the XML from my database and successfully binded it but my gridview displays an empty row below my datas like this:
[Code]...
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