Set Some Form Controls (textbox) To Values From A Single ADO.NET DataRow?
Sep 9, 2010
I'd like to see how others might handle this scenario and perhaps provide some comments on this particular solution for handling null values. I have run into a situation where my application requires data from an ancillary source that cannot be altered/changed, which of course means dealing with poor database architecture and implementation! In this case, my app is running into errors when attempting to set some form controls (textbox) to values from a single ADO.NET DataRow. Perhaps I should be handling this when attempting to set the controls? Not sure, but here is the current way this is done:
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Feb 2, 2010
I have a single form with a datagridview on it showing values from an oracle database. I am trying to set up a way of detecting if the row/column I click on is empty or not, just as a little exercise. I have so far got this:
Private Sub DataGridView1_CellClick(ByVal sender As Object, _
ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) _
Handles DataGridView1.CellClick
Dim c, r As Integer
c = e.ColumnIndex
r = e.RowIndex
[Code] .....
The message going into lbl2 shows the co-ordinate values of any box I click in but as you can see with the IF statement below I am trying to see if the system can detect whenever I click in a value that is empty (null or ''). When I run my form and populate the list with a column of names I can click in 0, 0 cell and I get a message saying the 'Box is not empty' as above.
But when I click in any of the next boxes e.g. (1,0) (2,0) etc I get this:
'Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index'
Pointing to this line of
If Not DataGridView1.Item(r, c).Value Is Nothing Then
Not sure what this means at all. I am under the impression that my piece of code is gathering the value of the item depending on the co-ordinate values. so why should this fail? What index/collection is VB talking about?
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Sep 27, 2010
Inside a form, I would like to display a pdf file which is already available in my resources (template file "untitled"). In this pdf file, I have some fields which get their values from some texboxes in another form. My aim is, when the user triggers the button to call this form, it should insert the values inside the pdf file and display the output pdf inside the form.I have written the code to an extend but could not finish it myself after my many trials... Now here are the two things I cannot manage:I can use a directory to read the template pdf "untitled1.pdf". But my aim is to use the file inside my resources. can save the output file in a directory but this is not I want to do. I want to display the output pdf.
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Feb 15, 2012
I'm designing a form and trying to get different opacity values for different controls. How should i do it??eg. clear visible text floating over 50% opaque form.
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Sep 30, 2011
I have to ask a stupid question:How to pass values from my form into the controls of other form?I made textbox and button in my form1 and Label into the form2 When I click the button, I want to pass the values of the my textbox in the form1 into the labels of my form2
I am a student and totally new to vb.net
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Jul 11, 2010
I'm trying to change the values of some of the controls in the ASPxGridview Edit Form, however they are not changing. It seems to be resetting? How can I do this and in which event would I do this in?
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Aug 16, 2010
I am using VB 2008 and Access DataBase. My code need to store original data values for row being updated to compare it with new values later. For this to accomplish I wrote following
Dim dRowOriginalRow
As DSetPurchaseSale.PurchasesRow
Private
Sub btnEdit_Click(ByVal
sender As System.Object,
[Code] .....
When I am running this code, i am not getting the original values in dRowOriginalRow variable insted it is also updating with new changes made in controls, so the dRowOriginalRow and dRowModifiedRow are always same. Again may I use Equal To sigh to compare both rows as I did in my code?
True : dtPurchaseDate.Focus()
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Oct 6, 2010
I'm sorting data in a dictionary there each key has a list with like 3 items.I want to get all the data from the dictionary to a datatable with the key and the list items on the same row.
all i manage to get is "key" System.Collections.Generic.List`1[System.Data.DataRow]
i'll guess somehow i will loop trough the list and add all elements to a string?[code]...
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Sep 5, 2010
I am trying to make a list, separated by a comma, of entries from a single column in a SQL database. I have been spending the last several days searching for a way to do this, but every thing I found either didn't work, or wasn't exactly what I was looking for.
The query will pull all the email address that are not null. What I need to know is how to take the result of that query and make it look like this:
email0@address.com, email1@address.com, email2@address.com, etc, etc, ...
I feel like I should know this, but for the life of me, I can't remember nor can I find it in any of the textbooks I have.
I am using Visual Basic 2010 and SQL Server 2005. I also have access to Visual Basic 2005 if needed.
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Jan 21, 2011
I need to display a column called Full Name in the my datagridview, but the datasource (datatable) does not have a FullName column. It only has FirstName and LastName columns. I'm setting up my DataGridView like this:
[Code]...
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Dec 16, 2010
I have the following code where I'm trying to bind a datarow to a textbox.
Me.TierNameText.DataBindings.Add("Text", Me.m_TierRecord, "tier_name") Problem is, when the form is displayed no text is shown in the textbox.
This code runs before I call the form's ShowDialog method. I stepped through the code to make sure the datarow has data, and indeed it does.
I rarely use databinding but thought I'd try it this time.
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Jul 29, 2011
I've used Me.Controls.Add() to add text boxes and now, I'm thinking how can I INSERT the data in these text boxes to database.
[Code]...
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Sep 26, 2010
I have 2 textboxes on form1 that I want to pass to 2 labels on form2, I used the Get Property to do this but i am getting errors, can anybody show me how to do this, I am new to visual basic
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Mar 24, 2009
i have to do the same work in vb as i have done in c#:
[URL]
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Dec 4, 2010
I have menu item, in which I have specified ShortCutKeys as "Del". On click of menu item I have called specific method. I have one form on which one textbox is placed. When I hit the "Del" key the same method which gets called on menu item click is fired. I want the default behaviour to be followed by the textbox. how to suppress the event to be fired and to achive the default behaviour of the textbox or other controls present on the form.
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Mar 15, 2010
I have a datagridview that
Using single controls on different tabs
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Aug 23, 2011
There is newer code in a follow up post. I suggest using the code in the later post rather than the code in this one. You can still read this post though. When designing a user interface, one should be conscious of how many individual controls are required to implement the functionality. In some cases an initial design may begin with many buttons or textboxes (for example) but then further review of
the actual required functionality allows for a reduction in the number of unique controls.
But other times, there isn't a better way (which will still make sense to the user of the application) then to have a series of many repeated controls. So in the cases where one can be certain that the best UI implementation for an application will require the use of multiple copies of a given control, then it often becomes necessary to maintain some method of managing all of those controls at various points
throughout the application. Doing so typically requires that one build up some collection of controls which can then be accessed by index in order to work with any given control; but this can lead to a lot of clutter in the code file which handles these control's events. For instance there will be some kind of collection declaration, some recursive routine to find all of the controls of interest, and then any number of event handler methods with long lists of Handles clauses, or additional code loops to wire up the event handling for each control.
Purpose Since most of this functionality could be considered a requirement regardless of the type of control being managed, or its required functionality, it may make sense to wrap all of the control management functionality into a single class. And since our first requirement is a collection of controls, then a base collection class could be the perfect starting point for our control manager. There are a number of existing thread around this topic, with some recent (at the time of this writing) ones being:[URL]..In this, and related, threads I have posted examples of a simple TextBoxManager and ButtonManager control. But again, with so much similar functionality required regardless of the control being managed, it would be technically possible to create a generic ControlManager(Of T As Control) class which can manage any type of control.
[Code]...
So in summary, one can facilitate managing a large number of user interface controls by building a "control manager" class which both encapsulates the list of control instances, and deals with adding and removing defined event handlers for every control it manages. The generic control manager class itself can be inherited and extended into a more specific class on a per-application basis in order to provide more application-specific functionality. Reed Kimble - "When you do things right, people won't be sure you've done anything at all"
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May 11, 2010
i am using vb.net 2005, in windows application, i have controls like textbox, listbox, radiobutton in one form, all the controls are required to fill, how can i validate all controls in one buttonclick..
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May 27, 2009
I have a Datarow array but now I need to show each row in a windows form so that the user can look through and find a suitable entry. Ideally the form would be like the DataView display with a BindingNavigator to go through the entries one by one. I have searched everywhere for some indication of how to do it but to no avail. [Code]
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Nov 11, 2009
I have aspx form with several textboxes.They are populated with values from a table via retrieval of a dataview.If the row count for the dataview is 0, then I'd like to reset the values in all textboxes. How can I loop through all the textboxes and set a default value?I've tried the following, but no sucess.
For Each ctrl As Control In Page.Form.Controls
If TypeOf ctrl Is WebControls.TextBox Then
CType(ctrl, WebControls.TextBox).Text = ""
End If
Next
My first For Loop was using Page.Controls but it returned only 1 count.The textboxes are inside a tabpanel (ajax), so do I have to locate the tabpage and then find all it's controls (for each tabpage)?
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Oct 18, 2011
This is a 2 part question about list comparisons. I see lots of threads on comparing two separate lists, but I need to know how to compare values in a single list.
Part 1:I have a bunch of string values that I am first splitting and then adding to two separate lists. The strings look something like this... 3-ABC, 6-DEC, 11-RFG, 6-ABC, 12-ABC, etc... So, with the code below(vb) I am splitting the numerical portion of the string and putting it into myLeadQtys(saved for later). I then take the rest of the string and put it in another list (myLeadVals):
Dim myLeadVals As New List(Of String)
Dim myLeadQtys As New List(Of String)
Dim strMtextValue As String
[code]....
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Feb 18, 2011
let me explain further i have table account. in the table are 2 columns namely account_type,Account_name.So on the forms, i want the combo to show the 2 columns even though ony one column would be saved. Am able to do this in access as attached.[code]...
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Jun 6, 2011
the code display 2 colunms in one combo box from a table. i have table with 2 columns account_type and account_name. the account_type is an abbreviation(codes) which would be stored in a new table when selected. I want the code when the combo is click, would display the code-account_type and account_name in the same combo box.
Private Sub cboAccount_type_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboAccount_type.SelectedIndexChanged
Dim cn As New SqlConnection(ConnectionString)
Dim query As String = "Select Concat(Account_type, ' - ', Account_Name) As AccountDesc, Account_type from Accounts"
[code]....
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Mar 22, 2011
I have a few problems i need to solve. Firstly, I am looking for a piece of code i can use to display a picture from a bank of pictures. It will work on the basis of generating a random number and loading a picture that corresponds to that number.
i.e. Dim RandNumber As Integer
Dim RandClass As New Random
RandNumber = RandClass.next(1, 10)
If RandNumber = 1 Then
Picturebox1.image = picture1
[Code]...
Secondly, can I then use subsequent picture boxes to display pictures from the same bank of images, without displaying the same image? Finally, I then need to be able to click the picture or a button beneath the picture to select it as an answer to a question and then the whole process starts again.
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Feb 18, 2011
I am developing a form which needed to display 2 values from a combo . I have table Account with these fields Account_type, Account_name in this table. Even though I am saving only the Account_type in to a new table but when selecting from the combo, I want the account_name also display since the account_type is a code so that user would understand the mening of the acount_type. vb.net code that would display both the code and the account name to this. I used data binding to do this, it also displayed only the code.
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Jul 9, 2009
I have this working for a single field in a text but im trying to add more than one fields data .[code]...
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Feb 23, 2010
I'm using VB.Net and SQL Server 2005.
I have two Listboxes that users can select multiple values. Selection Mode = Multiple.
Listbox1 has Customers
Listbox2 has Products
I would like users to select a Customer (single value) from Listbox1 and Products (Multiple values) from ListBox2 I need to insert the selected values into the database like this:
John Shampoo
John Toothpaste
John ShowerGel
How can I Insert these values with a single Click event into the History table?
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Nov 30, 2011
I am trying the following to select a long date, but becase the value is stored in SQL database as DateTime I am unable to return any results unless minutes and seconds match perfectly...I then tried to use 2 calendars and have the same issue with the DateTime format..
CODE:
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Jun 10, 2011
I have tested my code in order to pass single value to single parameter field in crystal report from VB.NET Form, it is ok but the problem is that I want to pass multiple values to only one parameter field called "Product Name" and it displays only one last record.
I want to display like this
Receipt : 0001 Product Name
pencil
pen
stamp
book
[Code]....
I already set parameter field "productname" for allowing to multiple values, but it is still the same.
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Sep 25, 2010
In VB6 you can debug.print multiple values from a loop to a single line by simply adding the ";" or "," chars.
[Code]...
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