Filtering What Characters Can Be Added To A Text Box?
Jan 27, 2010
I have a series of text boxes on my form, and my client wants me to filter out characters that aren't allowed, for example in the name field you cannot have symbols or numbers.
Now, he wants it so when you try and put in a special character it simply will not get entered into the text box. I know the logistics to this, but I'm not sure how I would go about coding it.
Basically what needs to happen is when the user types in characters like $, ^, 5, * etc, a function needs to recognise this and stop them from being entered into the textbox, whether it means deleting them as soon as they go in or interrupting the action altogether.
For a WinForms VB.Net application, I use the Bindingsource's filtering capacity to filter data, which is seen in a DataGridview. The BindingSource is from a DataSet, created using the Designer, and the data comes from a Access DB, using JetEngine and .Net 3.5. So basically:
This filtering works fine, however, now I included some extra columns in the DataGridView, which I'd like to filter on, too. Of course, when I feed the manually added columns to the Filter of the BindingSource, this doesn't work out.I've done some research, and was not able to find any way to use the BindingSource's filtering syntax on the DataGridview. I'd like to use this syntax though, as I designed quite a nice UserControl and class around it, to provide smooth, fast and simple filtering capabilities.
... where the left six characters are an offset and each xx represents one character and the string of cs on the right are the actual characters.
I've learned that I have to keep control characters out of that string of cs or the display gets messed up. I've been using this code and it works fine (when it's not commented out). (binbuf is a Byte array)
'Select Case Convert.ToInt32(binbuf(i)) < 128 ' Case True 'traditional ASCII character ' If Convert.ToChar(binbuf(i)) <> " "c Then
VS2010 (SP1) / .NET4 on Windows XP Pro Im having a slight issue with my password hashing function. The following function hashes the supplied password using SHA512 and returns a Base64 string.
I'm making a custom control suited for handling passwords. I have created a control that inherits from a text box and I have implemented a lot of things so far. But what i want to do now is create a system so that when a user types It will display his last character typed for a X amount of time.Is there a way to turn only selected characters into password characters and still be able to get the password text from the Text property ?
I am filtering a datagridview with text from a textbox.That works , but can i filter with 2 [code] Now the question , first i want to filter the Day and then Part Then fill the datagridview ,how or can i put this in one code ?
I am creating a form to display data in a DataGrid that is bound to a .mdb Query. I am semi-experienced in VB6 Programming, but relatively new to VS8 and all of the features. I created the form, and have the DataGrid that displays all of the info in the query. I would like to be able to filter the form to only display data that matches what the user would type into a text box on the form (I have a text box created as well as a command button that says "Search by...").
Additional Info - I do not have, nor do I want, the DataGrid Navigator displayed on the form.
I want the user to be able to type a value in the text box (Rack Number), then press the button (Search by Rack Number) to only display the data in the DataGrid that corresponds to the rack that matches the text box.
I know that the topic is kind of weird, but I will explain that here. I am reading text from a text box and inserting that into a listbox. I am wanting to read what the user inputs into the text box and add a character between each character they type. Here is what im wanting to do written out[code]...
i have 2 forms.in form1: i have 1 combobox in form2: i have 1 textbox and 1 button...I want to make in form2 when i enter some text in the textbox and press the button the text to be added in form1 combobox
I have one combobox, two buttons (Add and View) and listbox. When I click button Add text from combobox is added to text file. This is code for Add button:
I am trying to auto tab to the next text box after my limit of characters has been reached in a text box. Visual Basic 2010 Can this be set in the properties? I have 7 boxes, each allowed to hold only one character.
so i made a from with in it a WebBrowser now i added a Toolstripmenu and added some text in the toolstripmenu how can i make it that when i click in the toolstrip menu to go to an web browser
Private Sub World30ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles World30ToolStripMenuItem.Click End Sub
i thought it was something like call webbrowser but it didnt work out
Im new to VB and therefore i require some guidance in this tricky situation that im stuck in.Basically, what my program does is calculate the mach number of an aircraft when the speed of sound and value of temperature are added into the text box. The problem arises in 2 places. One, the program calculates the value of speed wrongly. And secondly (The major part) is that i want the program to display an error that i should enter both the values (that is, if only one value is entered and calculate button is pressed.)and if i enter any alphabets, it should give an error to please input numbers.
I have a form that users record some event that is happening. They enter in what different things are occurring, for instance like a Basketball game. When certain events happen "steal", "score", "foul" these will get inputted to a listbox that records the whole game and is timestamped. However for these specific event i want them BOLD . So it would look something like
3:24 STEAL 3:25 #45 stole the ball, passed to #54
Or something like that. How do i get certain items to be bold?
I have a program that adds controls on the fly to an auto-scroll panel. When the panel is scrolled (viewing the bottom of the panel for example) and a control is added, it looks like it is added assuming the top left corner of the panel is still at 0,0 when in fact it may be 0,500. To see what I am talking about, create an empty "Windows Forms Application" project and insert the below code into it.
Friend WithEvents Panel1 As System.Windows.Forms.Panel Friend WithEvents btnAdd As System.Windows.Forms.Button Dim ButtonCount As Integer
I've added some Labels to a form at runtime using this
vb.net Dim x As Integer = 25 For i As Integer = 1 To word.Length
[Code]....
Now, I would like to add text to one of them, but I'm not sure how. I thought by setting .Name I would simply be able to write something like lbl4.text ="A". But, of course, because the Label has not been created yet, this is not possible.
Also, I'm not even sure if .Name is working the way I think it is. I was hoping that it would name each Label consecutively: lbl1, lbl2, lbl3, lbl4...etc.
Am I naming the Labels properly? And how would I add text to one of these Labels?
i have multiple forms in a project and all have statusbar. there is no way to add textbox on status bar but in my previous thread i got the help to add the text box. i created a function in module so that i call that function from all the forms on load and add the textbox on status bar and also add the event on textchange. the function to be called on event change is in individual form (at present)[code]
I have a form with a text box and a form with a list box. I would like to be able to push a button on the form with the text box and have it be added to a list box.
I am adding controls to a page programatically in the code behind. I add an asp:Label and set it's Text value. I add an asp:TextBox and set it's Text value. Both Text values are returned in the Response and displayed in the browser. All fine so far.
The user performs an action that causes a postback. I re-load the dynamically added asp:Label and asp:TextBox. When the Response is returned to the browser, only the asp:TextBox Text value is displayed. The asp:Label Text value is not. If I inspect the HTML I can see the asp:Label control (rendered as an HTML span tag) but no value.
How can I get the code to automatically re-load the Text value of an asp:Label on each postback? Why is the behaviour different for an asp:Label and an asp:TextBox? I do not want to have to manually re-set the Text value on each postback.
Here is some code similar to what I am doing (placeHolderNameplates is an asp:PlaceHolder control on the aspx page): Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init If Not Page.IsPostBack Then
For example I only the second character in each line to be an x, while the 3nd to 10th character must be a hex digit.At the moment I use a Select Case, then check the position of the caret (using textbox.selectionstart) and see if the key being pressed is a "legal" character.Is there a better way of doing this as it slows down on large amounts of text.
This is the code I have at the moment: Select Case TextBox1.SelectionStart Case TextBox1.GetFirstCharIndexOfCurrentLine + 1
I need a simple method of counting all characters in a text box and when a button is clicked a message must display if the amount of characters has exceeded 25.
