VS 2010 .NET / Access DB - Column Created At Runtime Is Not Updating?
Sep 20, 2011
My program creates columns at runtime with the following
Cmd = New OleDb.OleDbCommand("ALTER TABLE [Parent] ADD [" & ColumnDate & "] int", con)
objCmd = New OleDb.OleDbCommand("ALTER TABLE [Parent] ADD [" & ColumnDate & "] int", con)
objCmd.ExecuteNonQuery()
I add data into the newly inserted column with the following
da.SelectCommand = New OleDb.OleDbCommand(sql, con)
Dim cb As New OleDb.OleDbCommandBuilder(da)
cb.QuotePrefix = "["
[code]....
I added a column to the table manually via opening the access database and all the above approaches work for editing data stored in that column. So I believe it is something to do with the fact that the columns are created at run time.
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Sep 19, 2011
My program creates columns at runtime with the following code:
Cmd = New OleDb.OleDbCommand("ALTER TABLE [Parent] ADD [" & ColumnDate & "] int", con)
objCmd = New OleDb.OleDbCommand("ALTER TABLE [Parent] ADD [" & ColumnDate & "] int", con)
objCmd.ExecuteNonQuery()
I add data into the newly inserted column with the following code:
da.SelectCommand = New OleDb.OleDbCommand(sql, con)
Dim cb As New OleDb.OleDbCommandBuilder(da)
cb.QuotePrefix = "["
cb.QuoteSuffix = "]"
ds.Tables("SchoolMaticsDatabase").Rows(inc).Item(ColumnDate) = Hours * Num
da.Update(ds, "SchoolMaticsDatabase")
All of the above works fine; the issue arises when I try to edit the information originally placed in the newly added column. These are the approaches that I have taken. (None of them give an error message; it simply won't update within the database.)
da.SelectCommand = New OleDb.OleDbCommand(sql, con)
Dim cb As New OleDb.OleDbCommandBuilder(da)
cb.QuotePrefix = "["
[code]....
I added a column to the table manually via opening the access database and all the above approaches work for editing data stored in that column. So I believe it is something to do with the fact that the columns are created at run time.
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Dec 23, 2010
I'm trying to develop a program that turns matrices into their reduced Echlon forms. The user specifies the number of Columns & Rows for the matrix, which is generated by the following Sub Routine
Private Sub ButCreate_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles ButCreate.Click
'Columns and Rows are specified by the user
rows = TxtRows.Text
columns = TxtColumns.Text
'clears all of the controls(text boxes) from the TableLayoutContainer
[Code] .....
How to do is access/manipulate those newly created textBoxes. After the user enters values to those boxes, I want to assign each of their columns to an array.
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Apr 18, 2012
I add textboxes dynamically at runtime. How do I access them later in the program?
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Oct 23, 2010
I'm trying to create a program that will append a new line of text in a text file embedded in the programs resources.... this is what i've tried:
[Code]...
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Dec 26, 2010
If I create new textboxes, or any objects, based on user input, how can I create methods that use those new textboxes (objects). For instance,
[Code]...
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Oct 30, 2011
Public Class Form1
Private tb = New System.Windows.Forms.TextBox
Dim posx As Integer = 0
[code].....
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Aug 25, 2010
I have an access table that I'm loading into a dataset, then I'm binding the dataset to a bindingsource. The bindingsource is the datasource for a datagridview. I can use a command builder to update the entire table, but I need to update all the rows (or changed rows) in specific columns. I have a column called "dPrint" which is Boolean. I'm not sure how to use the bindingsource as my datasource in an Update Command. I've tried this:
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Jul 16, 2011
it's just for a program registration. i would store all of the registration codes in the access database, then export it to XML, then upload it to my web host. I would then somehow connect it to my Visual Basics login form (Which I have already made). If this can't be done, having them register through the form and having all the allowed codes on the internet (So i can easily edit them)!
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Aug 12, 2011
This is the code for my 'validation' form, which reads stored numbers in an access database and compares them against generated lottery numbers to check for winners. It assigns divisions and prizes to each gameID from the table in the database and is supposed to write this information back to the database. However, I get an error on the very last line of code where I tell the data adapter to update the table in the database with the dataset. The actual error it gives me is "InvalidOperationException was unhandled". Here is my code (ask me questions for any clarification):
[Code]...
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Jul 14, 2010
I got an Syntaxerror in my INSERT INTO but i cant figure out why.
[Code]...
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Jan 17, 2012
I have part of an application that reads from a database makes changes to the data then saves the changes to the database.
[Code]...
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Apr 8, 2010
I've been working on an app for quite awhile and now am at the point where I have to incorporate an Access DB. Tried many things/variations of what I've found...but now am stuck. So here goes:
I have a Form with this
Public Class Form1
Dim objConnection As New OleDbConnection _
("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|Test.mdb")
[Code].....
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Feb 1, 2011
I'm using Access 2010 for 2 small databases for a windows forms desktop application.on Form 1, my datagridview updates Paccounts.mdb correctly as follows:
end_OK:
Try
Me
.PaccountsTableAdapter.Update(PaccountsDataSet.Paccounts)
[code]....
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Apr 20, 2011
I grabbed some sample code to generate 100 comboboxes at runtime. The short version of the code is shown below, I left out all the combo box fortmatting and placement details...
Dim TB1 As New ComboBox()
for loop
TB1 = New ComboBox()
Me.Controls.Add(TB1)
end loop
it produces all the comboboxes and looks fine, but i cannot figure out how to reference an individual combobox. Are they in an array? How do you single out a single combo box, for example, how would I check the value of the 33rd combo box?
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Dec 30, 2011
In the past I've used this code to create a database at runtime :-
Dim Cat As New Catalog
Dim Cn As New ADODB.Connection
Dim objTable As New ADOX.Table
[code].....
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Apr 25, 2010
I'm trying to create a datagridviewrow and add data to it at runtime. I want the row to have the cells correspond to the columns in a datagridview, so that when I add data to the cells i can call the column name (the columns are likely to change around, so i think the name is better to use then the index).I create the row using the following code:
Dim row As New DataGridViewRow
row.CreateCells(Datagrid)
and the column using the following code:
Dim col As New DataGridViewComboBoxColumn
col.HeaderText = "Reference"
col.Name = "Reference"
datagrid.Columns.Insert(0, col)
I would like to add data to the row via the following code (or something similar that uses the column name instead of the index:
arow.Cells("Reference").Value = Detail.Reference
However at runtime I get the exception Column named Reference cannot be found. Parameter name: columnName I have a sneaking suspicion that the cells cannot be accessed with the column name because the row isnt really attached to columns yet (the row hasnt been added to the datagridview yet. (I tried cloning the cells of a row and then adding them to the row but no success)?
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Dec 20, 2010
I have created multiple dropdown list at runtime and populated with data. I also have added an eventhandler to determine the selected value of the drop down list.
The code is as follows :
Dim tbl As New Table()
tbl.EnableViewState = "true"
[code].....
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May 4, 2010
I have made a form that creates a table in a database based off of the text a user inputs into a text box.I would like to then display that table in a DataGridView on the form so that the user can update the data in that table.Is there any way that i can add those tables to the dataset and get them to display in the DataGridView after the user clicks the create table button?
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Jan 31, 2010
With the following example of code, whenever the user clicks a menu item it will load up a new form. This form will then read from a database, and create text boxes throughout.
Private Sub allowances_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If mainMenu.currentSlic.ToString = "0" Then
[Code]....
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Mar 11, 2010
I have a repeater and within that repeater, I have an item template. Now this template is formatted with a couple of tables, but for this question I have removed them to make things easier to read:
<asp:Repeater ID="Repeater1" OnItemDataBound="R1_ItemDataBound" runat="server">
<ItemTemplate>
<asp:PlaceHolder ID="phAnswers" runat="server"></asp:PlaceHolder>
[Code].....
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Oct 28, 2011
i have created dynamic buttons at runtime and i would like to disable them when a user clicks on a form button.This is the code i have for that button:
Dim intXX As Integer = 0
Do Until intXX = intX
userAvatar(intXX).Enabled = False
intXX = intXX + 1
Loop
The buttonNames is an array of all populated button names created at runtime. However, trying the .enabled = false at the end of that does not work. What other ways are there to do that with buttons created at runtime?
[Code]...
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Jun 15, 2009
I am using the follwoing code to generate Menustrip at runtime.
Dim dgv1 As DataGridView
dgv1 = Me.MenuDataGridView
ReadMenuInGridView(dgv1)
Dim MItems As New SortedList(Of String, ToolStripMenuItem)
For Each dgr As DataGridViewRow In dgv1.Rows
[Code] .....
Where the sub "ReadMenuInGridView" passes the DGV by reference and populates it with the menu item from the database. My question is,, the program as it is in the form listed above works fine (where I have a DGV "MenuDataGridView" created at design time), however, if I want to make it 100% dynamic and use a DGV created at run time I will not get the menu? Actually the program will not get in to the For loop?
Simply to do that we can replace the first 2 statement with:
Dim dgv1 As New DataGridView
'dgv1 = Me.MenuDataGridView
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Oct 28, 2009
I'm developing an app which creates like 30 labels at runtime.The problem is that with the click of a button, I need to destroy those created labels.[code]...
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Jul 16, 2009
global variable can be created during runtime?
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Jun 3, 2011
i just made an form where with button add 10 textbox whith this code:
For X = 1 To 10
Me.Controls.Add(tx)
tx.Visible = True
[Code]....
now i want write somethings in textbox (i.e. textbox1.value="hello") but no find way, because in code is not defined textbox1, create at runtime (of course).
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Jan 18, 2010
I have a form on which I want to place labels created by code executed by clicking a button(cmdAddLabel) at run time. I subsequently want to move the newly created labels around on the form. The following code sucessfully creates the labels at run time whenever the cmdAddLabel button is clicked:
Private
Sub cmdAddLabel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAddLabel.Click
Dim
[Code]....
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Jan 16, 2012
Been searching a trying examples for a couple of days and always fall back to the "null reference" error on this one. I have a set of instructions coming from a SQL database and the number of instructions is a variable. Therefore, I have a TabControl which I add TabPages to at RunTime depending on the number of instructions there are. The TabPages are then created with the names; Step1, Step2, Step3, etc.Each TabPage is made with the same controls and all of the controls are named the same from page to page (e.g. "instr" is the name of a TextBox control that exists on every TabPage).I can successfully create a GetControl method that will return the correct TabPage, but I cannot reference any controls on that TabPage.I can only change properties of the TabPage.If I try to reference a specific control on that TabPage, like the "instr" TextBox control, I get the null reference error.[code]
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Dec 10, 2010
My
Public Class Form1
Dim x As Integer = 0
[Code]....
As you can see, i can retrieve the tag of the button (which is created at runtime) without any problems, i've made a temporary msgbox to show me the value of the tag, just for testing purposes. What i do have a problem with, is retrieving the tag of the individual web browsers, how should i do this?
Next issue, how would i code for my buttons to show the web browser with the same tag as the button that's just been clicked?
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Oct 18, 2011
I have successfully randomized certain pictureboxes in a grid to contain mines, and show that mine, and for testing purposes, those mines are currently showing. What do you think I need to do to be able to say[code]...
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