I have a textbox and I need to restrict entry to only the letters A-Z , a-z and the space key. I know I need to use something like
If (Microsoft.VisualBasic.Asc(e.KeyChar) < 65) _
Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 90) etc
with an e.handled at the end
I have a textbox which controls the interval of a Timer control. How do I filter out letters? Is it possible to restrict entry to numbers only (like if you enter a letter or a space, nothing happens)? Is there a property of the textbox that can accomplish this?
View 4 RepliesSo I basically want to make sure that a string entered by the user is valid. Valid being over 10 characters, containing only upper case characters, and only characters A - Z and spaces. The first two were easy, but I'm having trouble with the third, though.What I originally attempted to do was create a loop which checks if the first invalid character is present with the InStr function, by using the characters ASCII value. The next ASCII value is then checked, and so on until it has checked the string for every single invalid character. If an invalid character gets picked up, 1 is added to a variable, and after the loop is finished executing, if the variable is no longer 0, invalid characters have been detected.
View 3 RepliesHow would i get a certain text inside a textbox to equal that text space to space or null to space?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If Textbox1.Text.StartsWith(Textbox2.Text + " ") And Not String.IsNullOrEmpty(Textbox2.Text) Then
Textbox1.Text = Textbox1.Text.Remove(0, Textbox2.TextLength)
Textbox3.AppendText("a")
End If
Btw: after i finish this step my project will be finished!
I am creating a converter program (lengths, weights and such), basically just for the learning process because I still find myself very new to this.Well it's like this, I have a textbox where the user is supposed to write the value of the unit he/she wants to convert. As we all know there is a possibility to write in many weird strings which the program later on result in a big error. I recently managed to get rid of dots, because the program couldn't convert if there were a dot among the numbers "." (commas "," works great!). And now there are other types of errors I need to get fixed. I will make a short numeric list.
1. I wonder if it's possible to make dots "." to mean the same thing as a comma ",".
2. I also wonder if i could disable letters a-z or like -#@%&]?! and so on, i just want the basic 0-9 with a coma or dot.
3. I tried to make a Msgbox that tells the user when he/she has done an overflow, a number to big for the program to handle, for example [Observe the code is also trying to prevent the user from writing a minus "-":
(textbox1_textchanged)
If TextBox1.Text.Contains("-") Then
TextBox1.Text = TextBox1.Text.Replace("-", "")
[code]....
The minus thingy works great, but the 9999999... code, it always creates problems so I have commented it out for now until I know how to handle it.
4. Even though I got rid of the dot "." problem, the user is still able to write more then one comma, and I also want to get rid of that. The code I use right now for the "disable dot problem" is:
(textbox1_keypress)
If e.KeyChar = "," Then
If TextBox1.Text.IndexOf(",") > -1 Then
[code]....
I have to give textbox control id like below
<asp:TextBox ID="7_1" runat="server">
It is not allowing me. If I give
<asp:TextBox ID="Test7_1" runat="server">
Then it works fine. Why? Why can not give start with numbers?
i am trying to make a program and i only want the user to be able to enter numbers and use the backspace this is my code so far.
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Dim allowedChars As String = "0123456789"
[Code]....
i have tryed adding "ascii char (08)" to the program but its not worked
I want to make a function in VB 2008 with which u can make a textbox change some letters within the textbox when u click a button. So example: Textbox1 has got in it: url...Then when I click button 1, it has to change ....
View 8 RepliesI have an ASP.Net 2.0 textbox which I need to be validated as having some content, but where whitespace alone is valid input. A required field validator seems to reject a pure whitespace input as invalid. A regular expression validator won't fire at all on empty content. Is there a simpler way round this than using a custom validator control?
View 1 RepliesI'm using the ErrorProvider in VB.Net (2005) which is associated with a BindingSource that is bound to a custom object that I have created. This custom object contains a date field that has a "Date" data type that. I am using a "TextBox" to bind the date field in my form. My issue is, whenever the TextBox loses focus and is blank, "String not recognized as a valid DateTime" is displayed by the ErrorProvider and the focus can't be changed to any other control on the Form. It's good that the ErrorProvider validates entries on Date fields by default (I didn't set up my custom object to display this particular error for the date), but it should allow blank values. I want the user to be able to have a blank date with no error message displayed. How can this be done using a Date field bound to a TextBox?
View 2 RepliesHow to make validations for textbox allow numbers only or textbox allow letters only?
View 14 RepliesI have a modal popup that allows an admin to choose from a variety of checkboxes to add features to a specific product. If there is a checkbox that an admin believes should be available but isn't because that feature is not in the database, I have added a textbox so that user can add a new feature to the product.
Once I added the textbox, it stopped allowing inserts. At first it was in the same If Else as the checkbox for each loop, but I have recently changed it so the textbox is in it's own for each loop. I have an underline under the words txtFeature.Text that says Value of type 'Char' cannot be converted to 'System.Web.UI.WebControl.Textbox.'
vb code:
For Each feature As ListItem In cbxAddFeature.Items
If feature.Selected Then
Dim strSQL As String = "INSERT INTO Marketing
[code]....
Is there a way to grab the first 2 letters in a textbox?
as in if the user puts in hc7972
i need the full hc7972 bit and instead of having another textbox i can just use this to get the value instead
like the first 2 letter represent the team name
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click[code]...
i wondered if its possibile to have a textbox(multiline) full of letters eg
qwqewrtrfuiuouoiihgfgxfhcgjhvkjgjkvcvvnhj
adfsgfsgtrdsgrdgdrgadstgahfthfjfjfhsdhfhjkkxzc
cvxbxmbcnmhfgjdsfjtjnvvczdnerjEtrurtyururvfjsdf
and nor the number of spaces from a desired letter to the last.In the case above there is E(which i made capital letter).How can i code to know that from that E till the end there are 17 spaces?
How can I allow only letters A-Z (both lowercase and capital) and numbers 0-9 to be entered into a TextBox control? Also spaces are not allowed either.Goldfish64
View 2 Repliesis there a way to only allow uppercase letters in a textbox?
I want to run checks against something else and it's needs to be in upper case.
Is it possible to count the number of letters in a textbox OR label [code]...
View 7 Replieshow to change letters in TextBox example:
TextBox1.text="abcde fg" and a-->x b-->y c-->z f-->t after that must be TextBox1.text="xyzde tg"
i think that i need something like this
TextBox1.Text.Replace("a", "x")
TextBox1.Text.Replace("b", "y")
I'm just trying to add a simple function to the textbox for security that if i only allow 0 - 9 Numbers and i try to put a letter it wont let me
View 5 RepliesHow can i reverse letters in textbox...
textbox2.text = textbox1.text.reverse
This code doesnt work!!
here is my problem, I'm using a textbox to enter only letters, no number, so i'm using a loop with a decision structure to tell me that the input data is wrong and prompt to input the data again but when I enter the correct data in the input box, vb2010 display this error "Conversion from string to type 'Double' is not valid.", this problem is making me crazy.
[Code]...
how do i find space after a word that varies?
View 1 Replieswrite up the code for a program that could find all combination of the letters in a textbox and input the outcomes into a listbox, and I don't want any of them to repeat.
View 6 Replieshow can i delete the first 6 letters from a line in any TextBox?
View 39 RepliesHow to disable to enter some letters (a,b,c,d...) in textbox? I want to can write just numbers and colon ( in textbox.
View 11 RepliesI'm on VS 2008 I have one form contains many textboxes,when I write in one textbox (UserName) the letters and numbers should distribute to the other texts where each textbox has only one letter or number from the original text to get them ready to be encrypted.
What code I can use in text change event that takes the whole text and throw it in the other textboxes so each textbox has only one value ?
I want to set the mask for the textbox for only letters and numbers with no spaces like thisthe "*" represents letters and numbers)
View 17 Repliesis there any way to take letters out of a textbox then re-display them scrambled, such as the word Tissue then at the push of a button make the word displayed sisute or some other order?
View 11 Replieshow to typing uppercase letters into a textbox in VB .net 2005
View 5 RepliesI need to delete the first character on EACH line, IF it is a space. JUST the first character, since I have other spaces in other parts on that line. The stuff will be in a textbox. This is probably really simple. But, me being a noob, only found how to delete the first letter of a string, not a text file, while searching google.
View 4 Replies