VB - Validating Text Boxes - Customer Information Is First To Be Validated As All Being Strings And Not Empty
May 19, 2011
I have a problem in that I have five text boxes pertaining to a customer/client, where there is a txtbox for each: Name; Address; City: State; Zipcode. Of course all the txtboxes are "" at initialization. I also have 2 combo boxes and a 2D array for prices which I have finally been able to understand the array logic. I have also been able to do my necessary calculations for.
My problem. The customer information is first to be validated as all being strings and not empty. The combo boxes I was able to get to tie to my 2 dimentional array and get good output and calculations for a finished product. I am just having problems with the error messages. Also I don't want summary totals unless the data is valid. In other words, the user must enter a complete address and make decisions about the two combo boxes, both of which are needed to use the price array. I will change the comboBoxes to represent dress sizes,"S" "M" "L" and "XL" and the other combobox to describe colorRedSatin or colorBlackBroadcloth with a two dollar difference in price between them. 'That would be similar enough to the problem I need to solve.
Basically I do not want any numbers to appear for price of the dress or addons to the dress unless all validation is complete. I do understand how the radio objects work for discounts and check boxes for accumulating accessories. The program should not give any totals untill the user has input all customer information and made decisions about input from combo boxes and selected calculate from menu. Right now it calculates and puts zeros in when choices are not made from the combo boxes by the user. It will include correct amounts for radio buttons and checkboxes if anything is entered. I need error messages for customer inputs and combo box inputs (if not selected from list of option in drop down for choices) (basically if nothing was put in a text box, the text box is empty. Of course the problem is the user must enter something in all 5 textboxes and not get multiple error messages in rapid succession to fix. We can't always count on our users putting in good data.. When I tried a Do While False with ORs I was getting endless looping. I could not get it to work because it will never execute because the control never passes back to the user.
I don't want to list a series of If/Thens becauser the user will see about 7 messages, where he/she only needs to be fed one at the time. I hope someone can give me some direction. I just need guidance on how to validate the text boxes and combo boxes. The code is analyzed with a "Calculate" on the menustrip. I would like for the calculation not to calculate and put outputs into the summery text boxes unless all textboxes are filled and combo boxes are valid for all the customer information and combo box choices for my two combo boxes describing what is needed for the order to calculate. There are also the radiobuttons and checkboxes, DIMs, Const, Variables, but not having problems with that part I have my indexing problems on the combo boxes worked out also, so I am not concerned about those now except for getting the error messages when I should. I hope that I have described my issues fully. I am using visual studio 8 with Windows 7
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Mar 25, 2011
It appears to me to be right but always returns true.
vb
Private Function ValidateAllFieldsAreNotEmpty() As Boolean
Dim groupboxes = Me.Controls.OfType(Of GroupBox)()
Dim textboxes = groupboxes.SelectMany(Function(groupbox)
[code]....
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Aug 8, 2010
I have a datagridview and the cell gets validated in the validating event;
[Code]...
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Apr 11, 2011
I'm trying to use the events Validating and Validated on a ToolStripTextbox.
Private Sub txtMenuOwnIP_Validated(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtMenuOwnIP.Validated
MyIP = txtMenuOwnIP.Text
StatusLabelIP.Text = MyIP
End Sub
[code].....
Neither code is firing.The CausesValidatition of the txtMenuOwnIP is set to true.I can enter stuff into that Textbox and leave it using the Mouse or simply piush Enter, but the posted code won't get fired (used a Breakpoint in both subs). There are no other event routines for this command used.
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Oct 28, 2009
I have a custom text box component (inherits from system.windows.forms.textbox) that I created in vb.net (2005) that handles the input of numeric data. It works well.
I would like to suppress the validating and validated events from firing if the number hasn't changed. If a user is tabbing through the form and tabs from the text box, the validating/validated events are fired.
I was thinking that the text box could cache the value and compare it to what is listed in the text property. If they are different, then I would want the validating/validate events to fire. If they are the same, nothing is fired.
I can't seem to figure out how to suppress the event. I have tried overriding the OnValidating event. That didn't work.
Update:
Here is the custom text box class. The idea is that I want to cache the value of the text box on the validate event. Once the value is cached, the next time the user tabs through the box, the validating event will check to see if the _Cache is different from the .Text. If so that is when I would like to raise the validating event to the parent form (as well as the validated event). If the _cache is the same, then I don't want to raise the event to the form. Essentially the text box will work the same as a regular text box except that the validating and validated method are only raised to the form when the text has changed.
Public Class CustomTextBox
#Region "Class Level Variables"
Private _FirstClickCompleted As Boolean = False 'used to indicate that all of the text should be highlighted when the user box is clicked - only when the control has had focus shifted to it
[Code]....
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Jun 21, 2012
I am just adding validation into a new winform. I am using the validating and validated events, in conjunction with an error provider control.No problem with first validation (ie. if user enters more than 12 characters). Error is set in validating event, and error stays until user enters 12 or less characters. Validated event is then entered and error is reset to empty string.
However, there is a problem with the 2nd validation on same text box. The code checks for zero length in text box.. and sets error with provider. Watching in the debugger, this code is indeed invoked, and error is set ok. Then something weird happens, the validated event is (unexpectedly) fired, and the code there promptly resets the error. Why is the validated event fired when there is already an error set ? This seems like a .NET bug. Can anyone suggest another way of doing this, or say what I am doing wrong ?
[Code]...
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Jun 21, 2012
HStrange Issue Validating Empty Text Box in Winforms
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May 5, 2011
I am having a problem with validating multiple text boxes in using VB.net. I have all boxes validated to display errors if the calculate button is click and the boxes are blank and I have each individual text box to display an error message if the appropriate requirements (values) are not entered. The issue I am having, I don't want these errors to pop up when a user clicks the clear button to re-enter new values,in which this occurs on each box. Below is the code I have for validating each textbox. If a user clicks the clear button (in which clears all text boxes) I still have my errors displayed to them in which I don't want
Private Sub txtLoanAmount_TextChanged(sender As System.Object, e As System.EventArgs) Handles txtLoanAmount.TextChanged
If IsNumeric(Me.txtLoanAmount.Text) Then
[Code].....
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May 14, 2009
I have a DataGridView that has some columns with dates. It binds to an in-memory Datatable which gets loaded from an string array of data passed back from the backend Some of the rows returned have nulls for the date columns. Solution 1: If I define the Date column in the DataTable as "string" I can easily convert those nulls to empty strings and display it in the grid as empty strings (desired results). However, if the user clicks on the date column header to sort by date, it doesn't order the rows as you want. You get a purely string sort order. Not acceptable
[Code]...
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Jan 13, 2010
I have an application that has more than 20 text boxes used as inputs(numeric) ( in a form with multiple tabs), and from these numeric inputs I calculate many parameters and display them in other text boxes.The question is how can I trigger an event that will run the calculation procedures each time any of the text boxes numeric values change?( with out having to make procedure for each text box validated eventIs there some thing like a common validation event for any entry in any text box?
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Aug 5, 2011
How will I check that the dynamic textboxes is empty;
Here's the code:
Imports System.Data
Imports System.Data.SqlClient
Public Class FunctionProcessor
Dim objcmd As New SqlCommand
[code]....
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Sep 19, 2010
I'm writing a program for my class, which pretty much is an energy cost calculator. It takes 4 inputs from 4 text boxes and multiplies them, and the result is the cost. Well, now I have to come up with a way to check for empty text boxes and display a prompt to enter a number. I've tried inserting multiple codes to display a prompt and to no avail nothing has worked, I also receive the error "when casting from a number, the value must be a number less than infinity" error.
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Aug 8, 2011
For example, I clicked the Add Text box button, so it added 3 text boxes in the form (I used Dynamic text box so it can add multiple text box). When I input data to one of those 3 text boxes and then Save button has been clicked. It should checked whether the dynamic text boxes are empty or not. If there are empty text boxes, then saving data to db should not be continued and display a message telling the user that empty field(s) are invalid.
In the code below, it saves the data even if there are empty text boxes and I think because it is in the for loop, it checks the text boxes one by one and repeatedly displays the message box that I coded.
Here's the complete code:
Imports System.Data
Imports System.Data.SqlClient
Public Class Form3
[Code]....
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Nov 16, 2010
I have an insert statement which works fine but before the record is saved I want to validate the text boxes. So I just need to know how to check for empty text boxes before the save button is clicked on. I have seen a couple of examples like:
Dim ctr As TextBox
If ctr.Text = vbNullString Then
MsgBox("empty box")
[code].....
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Jun 22, 2010
I have an array of 50 text strings, is there any way that i can easily link each item in the array to a different text box on the screen? and then to have the text boxes auto update if the array changes?
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Jun 20, 2011
I have a text file with preferences in it. I read the file and find text on a particular line like this:If InStr(sLine, "avidDirectory") Then This is my line in the text file: avidDirectory "S:Avid MediaFiles" "D:Avid MediaFiles" "Z:Avid MediaFiles"..What I need to do is read each string between the quoations marks and place each one in a text box.I have 5 texts boxes to use if there are 5 different directories above (only three in the example above)So I guess I need to capture the text between the quotation marks, create a new string from it, and place that string into a text box [code]
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Feb 24, 2011
I am designing a prisoner system for a assignment.I have this structure up to now:
Public Structure prisoner
Public forename As String
Public surname As String[code]....
I need to know the code to put this information in the different text boxes that i have.
Eg John goes into txt1.text
Smith goes into txt2.text etc.
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Jan 2, 2010
I have a text file containing 10 pieces of information. I want to read the information from the text file and put it in text boxes on a form, so that the user can view the information and edit if required. What is the best way of approaching this?
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Apr 18, 2009
I am trying to write a program that will compare two strings in different text boxes. Then it must add 1 to a third text box for every time a letter appears in both text boxes. So for example if textbox1 said ABCDF and textbox 2 said ABTR it should return the number 2 because A and B appear in both.
This is what I have so far
Public Class Form1 Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles string1.TextChanged
End Sub
Private Sub Compare_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Compare.Click
Dim string1 As String
Dim string2 As String
Dim Result As Integer
End Sub
Function stringcompare(ByVal string1 As String, ByVal string2 As String, ByVal string3 As String) As Integer
stringcompare(string1 As string, string2 As string) End Function End Class
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Feb 10, 2011
I am receiving information via a serial port as Integers. The information is the displayed on textboxes(two text boxes). My problem is that, I am failing to transfer this information to a Datagridview.I have written the following code.
Private Sub BtnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSave.Click
TxtDuration.Clear()
[code].....
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Jan 21, 2009
After I have entered data into 12 textboxes and pressed a button to execute the code, the data from the text boxes goes into a database.I want to clear the information in the text boxes after the button has been clicked, at the moment I have 12 lines of code which are similar to this.
MsgBox("Data Has been Added to The Database")
tbeventId.Clear()
tbtitle.Clear()
tbstartdate.Clear()
tbvenue.Clear()
is there a easier/simpler way to remove all data from the text boxes without using 13lines of code
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Mar 19, 2009
I know how to load a txt file into a single text box, but im having trouble loading a text file with multiple output information into multiple text boxes using commas to separate the information.
ex)
txtfile:
123, Employee Name, Employee DOB
[code].....
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Oct 11, 2010
I think the problem arose because of Windows 7, but when I was at school the program worked. The program fills in the text boxes with information from Microsoft Access. However, my laptop has Windows 7, and when debugged, the information doesn't fill in the text boxes like before. Also, for added information, the school's computers run with Windows XP.
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May 18, 2010
Basically my program creates a text file based on whatever is contained in the 6 list boxes. What i need it to do is load the text it created back into the relevant list box. text file looks like...
Consignment Number-----Shippment Method------Expected Departure Date
CC33-1EA------------Express Air-----------18/05/2010
[Code]......
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Oct 2, 2011
I want to pull information from an array and place it into a chart of text boxes on the form. I have used a control array before but this time I want to create a dwo dimension control array. My guessing is not working... The display will be 10 x 10?
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May 24, 2011
I 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?
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Nov 8, 2010
I'm trying to add 3 customers to an array that I can then display in 4 seperate text boxes on my form. First Name, Last Name, Account Number and Balance.
Public Class Customer
Private firstName As String
Private lastName As String
Private accountNo As Integer
[code]....
Error 2 Argument not specified for parameter 'account' of 'Public Sub New(first As String, last As String, account As Integer, balance As Decimal)'.
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May 8, 2012
I have code which saves DGV contents including check box columns as a comma separated text file. I also have correct code which will take the text file and re-insert it into the DGV at a later time. This all works.When I'm working on the DGV, I have this
Private Sub DataGridView1_CellValueChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellValueChanged
If DataGridView1.Columns(e.ColumnIndex).Name = "Column12" Then[code]....
So that when the check box is true, columns 1 and 3 turn different colours, and when false, go to a yellow colour.However, when I "re-insert" my DGV info from my text file, the check boxes come back correctly - as true and false on the right rows - but columns 1 and 3 don't change colour. I've tried a "DataGridView1.Refresh" option but not getting it to work.The DGV is unbound. I need it to recognise which check boxes are true and update automatically when the information is opened from a text file.
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Nov 15, 2009
I have an application that connected to a database (SQL Server 2000) .Is there any way to send an information and Report made by Crystal reports by mail so customers can check it from his email?
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May 31, 2010
I am attempting to create a program which saves customer information for a business e.g first name, last name, address etc. but i am having trouble coding the save , new, print, next/previous record buttons.
Would someone be able to link me to a tutorial which explains how to do these?
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