.net - Get An Integer Value From A List Box Populate With DataRowView?
Jan 6, 2010
Is there a way to get an integer value from a DataRowView? I have a list box with datasource set to a binding source. I would like to be able to do this:
dim num as integer
num = lstBox.SelectedValue
But I receive an InvalidCastException:
Conversion from type 'DataRowView' to type 'Integer' is not valid.
This is how I fill my list box:
myDataAdapter("SELECT CustID FROM Customers", cn)
myDataAdapter.Fill(myDataSet, "Customers")
myBindingSource.DataSource = myDataSet
[Code]....
I have one list box this works for and one it doesn't, so far. The only difference that I notice is: the one that works, the Query in the data apapter retrieves and auto number from my access table, the one that does not work, the Query in the data adapter retrieves a number.
Or, is there another way I should go about this?
The application that I am trying to make is a form with a list box for CustID, OrderID, ItemID, and others. The CustID is from table Customers, OrderID is from table Orders, and ItemID is from table Items.
View 1 Replies
ADVERTISEMENT
May 25, 2010
1. How can I populate a List(of Integer) from datarow
2. How can I take only certain columns from datatable.select() and copy the data to datarow? So it's like this: datatable dt has columns ID,Name,age,address and DOB I want to take only the columns name, address and age where age>40 and put the result set into a datarow dr.
View 8 Replies
Feb 29, 2008
Is it possible to change a datarowview object to an integer?
View 3 Replies
Mar 1, 2010
I have 2 forms, frm1 and frm2. frm1 has a combobox, cboLocations and based on what selection is made here, frm2 is loaded and its combobox, cboOffices is populated. I currently have the following code on frm1:
Dim frm2 as New form(cboLocations.SelectedValue.ToString)
frm2.ShowDialog()
When running, I'm getting an InvalidCastException was unhandled...Conversion from string "System.DataDataRowView" to type 'Integer' is not valid." error.
View 14 Replies
Mar 1, 2010
I have 2 forms, frm1 and frm2. frm1 has a combobox, cboLocations and based on what selection is made here, frm2 is loaded and its combobox, cboOffices is populated. I currently have the following code on frm1:
Dim frm2 as New form(cboLocations.SelectedValue.ToString)
frm2.ShowDialog()
When running, I'm getting an InvalidCastException was unhandled...Conversion from string "System.DataDataRowView" to type 'Integer' is not valid." error.
View 7 Replies
Sep 30, 2010
I'm populating a custom dropdown list control on the fly that's tied to data grid using VB .NET 2008. The form will display all the manufactures when the edit button on the data grid is selected.
The dropdown I created works fine. However, when I try to populate the drop down with the respected manufacture values from the database, I only get a value of "System.Data.DataRowView" that being populated in the dropdown list as opposed to my values from the database.
Here's the basic code I use to first create and populate the drop down control:
<asp:DropDownList ID="Manufacturedd" Runat="server" DataSource='<%# m_ItrackerData.Tables("Misc_Manufacture") %>' SelectedIndex='<%# getSelectedManufacture(DataBinder.Eval(Container, "DataItem.Manufacture"))
%>'></asp:DropDownList>
[Code]....
View 1 Replies
Aug 9, 2012
I know vb.net does not include pointers like C language. but I am trying do populate an simple integer array with variable of the same type for example :
dim variable1 as integer = -1
dim variable2 as integer = -1
dim intArray() as integer = {variable1,variable2}
[code]....
it is a very simplyfied verson of what I want to do.I want to change the value of ma variables with my array referencing them with an index as if my variables were pointers of integer in c++ for example so that normally after the example, both variable should hold the number 3 instead of the number -1?
View 3 Replies
Nov 18, 2009
If I can generate a list of random integer with a click of the button and put the results in a list box using VB.Net but how do I randomly change several integer number generated by button 1 by clicking button 2? How I retain the results of button1 and change the results when clicking button2?I try before but the two button function code cannot relate to one another.
View 1 Replies
Aug 13, 2011
I'm trying to code a class of RandomNumber. One of the class methods needs to populate a "List (Of RandomNumber)" ... which was passed as a parameter to the method ... with 10 random numbers between 1 and 50. DEAD SIMPLE :)
View 6 Replies
May 10, 2011
I'm working on a project for personal use to make my life as an IT administrator a little bit easier. (Yea right)So basically, i'm creating a windows application with a form. On this form, it has a button, and a listview.When they click this button, it will load all "Windows XP run commands" into the list view. I also, have a on-click event to capture a click on certain lines in which it will automatically open said run command, or shortcut.
Here is an example of what I am working with so far. (It populates correctly, and the clicking event works like a charm. However, i'm just looking for a better way to clean this code up, or maybe, a better way to go about everything).Once done, I will populate this to the codebank if there isn't another similar thing out there.
On to the code:This is what I have for the form_load event
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
With ListView1
.View = View.Details 'Changes the view to "detailed" view
.LabelEdit = True 'Allow user to edit text
[code]....
View 3 Replies
May 10, 2009
I'm trying to populate a list box with XML so that when the user clicks on a list item it them populates with the next set of elements.
View 1 Replies
Oct 26, 2011
In vb 6 I have on my form two listboxes I also have a dao data control called Data1 My database is in access and is called SampleDB.mdb
My code in VB 6 is as follows
Private Sub Form_Load()
Dim RI As String
Dim CurrentDB As String
[code].....
This simple code populates both List1 and List2?
View 1 Replies
Jan 9, 2011
I don't have access to VB.NET right now so I can't test this value:Dim lst As New List(Of String)(cookieValue.Split("$"c))i got this from another question , but was wondering if A. The list will populate correctly and B. What does the c represent?
View 2 Replies
Aug 23, 2009
Can someone point me to a tutorial where I can learn to use the OpenFileDialog to poplulate a list box?My goal is to have a user create their own list box this way so my code can copy files to a new location without risk of damaging the original file.I am just starting to look at VB so I need some detailed instruction
View 1 Replies
Dec 14, 2008
I'm very new to VB.net/Vb2005. I just finished my first semester learning VB and I'm working on a few personal projects to solidify/increase what I've learned this year. Right now I'm building a simple inventory application that will keep track of individual users at my job.
The problem I'm having is in trying to populate a comboBox with items from a text file. My goal is that when the application loads, a comboBox will be populated with the names of users(located in a text file.) Upon selecting a user, the application will read some other(like users name, windows version, computer name, etc) data from another text file and populate the applications text boxes with that information.
I know how to go about building most of the application, but the problem I'm running into is how to use a text file to populate the comboBox. If I use an array or a collection for the comboBox data, then the user list will be lost each time the application closes. Also, whenver a new user is added, that data will be lost, because the collection or orray will be lost each time the application ends. Also, I don't want to use a database for the program, just a simple file.
[code]...
View 11 Replies
Jun 6, 2012
since this
(vb.net)
Dim test As New List(Of Integer())
test.Add(New Integer() {1, 2, 3})
test.Add(New Integer() {1, 3, 3})
test.Add(New Integer() {3, 2, 3})
[code]....
does not work, how would you do the distinct?
View 2 Replies
Oct 26, 2009
How can i get the integer value alone from the combobox list. For examle, if the item in the combobox is "ABC 01", i want to get the value "01" alone into my code for processing. How can i do it?
View 3 Replies
Jun 9, 2009
I have a dropdownlist that I want to populate with a specific value and specific text. I'm not using a datasource but I am manually making a connection and retrieving data in code. How can I populate this dropdownlist? If I read the data with a datareader and increment an array I only get either the value or the text. This is what I have so far, but it is completely wrong:
//connection string etc goes here
Dbcmd2.CommandText = "select dept,deptname from table"
Dim dr As SqlClient.SqlDataReader[code]....
How can I get this to work without having to create a class object for Department? Is there anyway or should I create the class object?
View 5 Replies
Jul 20, 2009
I'm trying to populate a treeview from a list of folder path, for example:
C:WINDOWSaddins
C:WINDOWSAppPatch
C:WINDOWSAppPatchMUI
C:WINDOWSAppPatchMUI�40C
[code]....
Notice there's no 'C:WINDOWSMicrosoft.NET' or 'C:WINDOWSMicrosoft.NETFramework' in the list.
View 5 Replies
Dec 30, 2009
I'm trying to get a listbox to populate a list of processes that are neither running nor in the "blocked" list. This code is in a timer, so it also checks if the process is already in the list.
For Each proc In Process.GetProcesses
Dim allowed As Boolean = True
For Each item In Blked.Items
[Code]....
It is strange because this is populating the list, but adding the same process over and over again, even though I seem to have the checks in there.
View 2 Replies
Nov 19, 2010
(This a follow-up to a previous question. VB.NET WPF NullReference Exception)I have a TreeView with a parent node and two children node. Each of the nodes contain a checkbox stored in a TreeViewItem. I want the two children node checkboxes to be set to IsChecked=true when the user checks the parent node and I want the two children node checkboxes to be IsChecked=false when the user unchecks the parent node.
I have a for loop in which the child node checkboxes are stored in a list. The parent node's checkbox check/uncheck event should iterate through the child node checkbox list but I am having a problem with the childCheckboxes list in the chkbox_AllChecked function (the parent node's checkbox check/uncheck event). For some reason the list is empty. I think the problem is how I try to populate the list while inside a For loop. Can anyone explain what I am doing wrong?
[Code]...
View 1 Replies
Nov 7, 2011
I want to populate my combobox with the list of banknames available in my database.. I tried doing so but I am getting a blank list. i.e.. shows no value in combobox!
Here is what I tried...
Private Sub ComboBox4_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox4.SelectedIndexChanged
Try
'MsgBox("Open")
cn = New OleDbConnection("Provider=microsoft.jet.oledb.4.0;Data Source=E:\Project-Hemtech\HemDatabase1.mdb;")
[Code] .....
View 4 Replies
Jan 6, 2011
I want to populate a Combo Box with a list of names and from that have the contact information (address, phone, email, ect..) populate a series of textboxes. The list is roughly 20 names, but it could grow to a hundred or more. Since the contact information changes periodically, I would like a very easy way to maintain it (Excel or Access).
Update: I am just trying to understand whether I should use Linq (have to learn it) or is there some other way this should be done.
View 6 Replies
Sep 20, 2010
I am trying to populate a form from a list of values. I am fetching data into a recordset. I have a textbox that displays the date, however, when I try to assign a date value I am getting the error message that I cannot set the textbox value to a textfield. Is there a way to assign the date value to the textbox?
lForm.txtFromDate = dgvRequests.CurrentRow.Cells("leaveStart").Value
View 4 Replies
Jan 10, 2012
If I run my web service code, it generates a serialized XML with only one level, that is,ParentElement and ChildElement. My goal is to make it a multiple XML levels that even grandChild will show, as the sample output below. How can I achieve this using List ollection looping. Do I need to create several functions that returns List objects for each column of the dataset I have?
public List<MyClassEntity> ExtractEmployee(...params here...)
{
...SQL CONNECTION HERE AND SP TO RUN THE QUERY...
[code].....
View 2 Replies
Apr 12, 2011
I'm trying to populate a List with a column of a DataTable in order to later convert it to a AutoCompleteStringCollection later. Is there a neater way to do it than the "good old" For Each?
Is there a way to use myDataTable.Rows.CopyTo for this task?
View 2 Replies
May 29, 2009
I have a list defined like so[code]...
using .NET how can I add items to the list dynamically? I also need to specify the class name on each new item
View 4 Replies
Nov 1, 2009
I am probably not even saying it correctly when I pose the question.
I have this simple class (starting out)
Public Class Players
Public Name As String
Public Sub New(ByVal name As String)
[Code]....
I'd like to be able to use players globaly thru-out the project. So if I navigate away from the form that created it. I can access it again.
Dim players As List(Of Players) = New List(Of Players)
View 7 Replies
Feb 18, 2012
I need to fill a List with data from a DataColumn fetched in dataset. How can I achieve that in 1 step without looping through the entire table in dataset.I want something like this:
Dim lst as List (of Integer) = ds.Tables("Customer_Data").Columns(0)
However the above line is wrong as System.Data.DataColumn cannot be converted to System.Collections.Generic.List(Of Integer)
View 1 Replies
Sep 9, 2010
i want to build a datatable where each cell has a list(of integer)
is there a way to force the table to add automatically a new empty list(of integer) in each cell every time a new row is created without adding this cell by cell ?
View 3 Replies
