Asp.net - Dropdown Does Not Fill From BLL
Nov 26, 2011
I want to fill a dropdown in the pageload by using a BLL and DAL class. This is the code
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
dropBrand.DataSource = BLLManufacturer.selectManufacturers()
[Code]....
The first dropdown fills up with brands as it is supposed to do, but the second does not. The second dropdown needs to show car models by the chosen brand in the first dropdown. However the dropBrand.SelectedValue always returns 0 whatever brand I select. Without the convert toint16 it doesnt work either nor with convert toint32 or toint64.
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Sep 3, 2009
I have a list of servers in the first dropdown. I want to get list of all databases in the second dropdown depending on the server selected in the first dropdown.
For this I need to query each server while selecting the server.
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Sep 23, 2009
I just want to display data of a single column from an oracle table into a datagridview or a listbox for readonly with no requirements to make changes to it. Simply display the information.What is the best way forward... To used DATAADAPTER or DATAREADER.s DATAGRIDVIEW SLOWER TO FILL THAN a LISTBOX.i am using the following code to fill datatgridview but for some odd reasons at time it is slow to display the data. I want to use listbox instead
Dim ds As New DataSet
Dim adp As OracleDataAdapter
adp = New OracleDataAdapter("select customer_name from customers")
[code].....
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Aug 14, 2009
I am trying to make a database, fill it with tables and then fill the tables. I am having problems connecting to the server and am really not sure why. I have posted this thread in two areas of this site because I was not sure what was the best area to put it in. [code]
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Dec 28, 2009
I am limited for space on my form. Is there a way that I can have a textbox act like a dropdown? So the form will show as one line. If the user starts typing multiple lines then it opens the drop down so they can see what they have typed. Will it have all of the same goods as a textbox, like copy and past? When they are not typing then it will be closed and only showing the first line.
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Oct 14, 2009
I have been to internet hail and back trying to figure out what Im doing wrong with my combobox cells and columns.When I add items to the cell using .item.add("something"), othing shows in the cell. I can add 5 items and nothing shows up. No dropdown and nothing in the cell. In debug, I can stop and look at the cells value and see that n-items where indeed added but yet, they dont show up on the screen in the DGV.I have a DGV and I have tried this 2 ways.. creating the columns in the form designer and by adding the columns in code.Heres a snippit of the datagridviewcomboboxcolumn (thats a lot of typing) anyway.. this is the def for it and the surrounding columns:
Dim conx_text_col As New DataGridViewTextBoxColumn
conx_text_col.DefaultCellStyle.BackColor = Color.Teal
conx_text_col.DefaultCellStyle.ForeColor = Color.White
[code].....
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Jan 4, 2011
I have created a sub that I am using over and over again. However, I am not able to get the values from the database. Screen shots and code attached. I need a second pair of eyes, can't seem to figure out what is wrong.
Form Load
vb
'Populate the drop down lists
PopulateDropDownListFromDB(cboReferrerType, "ReferrerType", "ReferrerName")
[Code]....
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May 11, 2011
I have a large VB/SQL application that I have created a problem in. I have a table of procedures that have an active flag on them. This flag can be toggled through a user screen. Other screens access this same table to populate dropdowns. The values are stored in the table as the ID field (PK). The problem I have is that I am selecting the dropdown values based on the Active flag. If I select a record that has a procedure stored in it that has been made inactive, I get the old Object Not Set to an Instance.... error.
What I want to be able to do is check for the value in the record when populating the dropdown and allow the record to be displayed by bypassing the SQL error and just showing the dropdown value as blank while not altering the record itself. I hope I'm making sense. Code is below.but I'm back in app programming after being a SysAdmin for 20 years and I'm still rusty.[code...]
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Sep 29, 2009
How can i make a dropdown list with checkboxes ? I have a windows app ( vb.net) and the checkboxlist control is not real an option with the available space on my form.
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Aug 15, 2009
Urgh, I have spent the last couple of hours on this now. I normally end up finding the answer from a bit of Googling, but not with this one. Bit of a headache.
My questions:How can I catch when a user clicks the dropdown arrow on a combobox and prevent the dropdown list from being displayed.How can I then clear and populate the dropdown list and display it programmatically?
I have one agent program remotely connected to a server over the internet. When you click the dropdown arrow on the agent, it queries the server to determine what needs to be in the dropdown list. It then displays the dropdown list. The comboboxes act as filters for the subsequent comboboxes on the GUI. A delay in displaying the dropdown list is perfectly acceptable while retrieving the data. Initially querying all the possibly entries in the dropdown list is not an option because there are so many! Needs to be comboboxes compared to listboxes as the user may also type an entry that is not in the list.
[Code]...
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Jan 11, 2011
VB.Net / Winform.Is there a component that will look like a Button but when pressed will open like DropDown, but the DropDown wil contains a list of Buttons? Menu bar won't work for me in this case.
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Aug 3, 2011
How can I add a data to my drop down list came from database? My code is this. And when I try using this:
<form id="form1" runat="server">
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
[Code].....
It got errors in a webpage that says controls are not allowed to be put here. I only have an empty dropdown right now.
<asp:DropDownList ID="DdLocation" runat="server"></asp:DropDownList>
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Oct 14, 2011
Is there a way to add to the "Show Output From" dropdown list. I've been going in circles on MSDN looking at Listeners, Writers, Trace, Debug, ConsoleTraceListeners etc. with no luck. I really would like my own pane for debug output because I don't want to disable any of the messages in the debug pane, and a lot of stuff gets pumped out there.
I found a way to add a new pane to the output tab through a macro/addin but don't know how, or if, it can be written to through code.
Short of that I'm really just looking for a better/more intuitive way do display debug output. Colored would be nice. I've tried very unsuccessfully to use nLog - but the configuration/documentation left me scratching my head.
Is the output window really what most people settle for?
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May 8, 2009
in an sql table there's an id, first name and last name field. i'd like to concatenate the first and the last name fields and display it as one in a dropdown control.
this is the vb.net code:
con()
sqry = "[SELECT QUERY]"
sqcom = New SqlCommand(sqry, sqcon)
[Code]....
^this code displays only the first name. how do i go about concatenating in asp.net?
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Oct 21, 2011
I have a web form in which i have droped 6 dropdownlists and each dropdownlist have previous seven dates to open files from a specific folder concatenated with date at the end of file name.Problem is that when i select first dropdown list it opens file fine but when i select a date from anyother dropdownlist to open file then it open the same file which was opened from the first dropdownlist.Please see the code and make correction in it.
[Code]...
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Jul 3, 2010
I'm trying to make a user control similar to the Windows Vista/7 breadcrumb bar used in windows explorer. However, when I show the drop down menu for a breadcrumb with many sub items, I get a very long list that sometimes exceeds the screen size. In the Windows Vista/7 example however, there are a maximum of 18 items displayed at a time and a scrollbar appears at the right when the number of sub items exceeds this number (18).
[Code]...
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Aug 3, 2010
So in winforms, every dropdown combobox has this little arrow thingy to the right that tells the user it's a dropdown, kinda like this:Now how do I figure out how wide that is in pixels? Reason is, I'm using ControlDrawToBitmap, this doesn't draw the text properly for the combo boxes, and I can redraw the contents, I just whack some of the arrows (which are drawn properly).
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Mar 24, 2012
I have a problem with my combo box. Currently when i select the drop down option I get only one row that is picked from the database. However I would like two Columns to be seen. The Table is [User] with fields - ID, Position, Details.
It currently shows 'Position' However I would like it to drop down with:
______________
ID | Position |
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Jan 15, 2012
Using VB.NET I created an excel sheet with list of items in dropdownlist.[code]But i can able to view the listbox upto "testing", rest of the items are not diplayed in the listbox why?Is there any limit for dropdown list items, If so how to increase the limit?
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Oct 27, 2011
I am using VB.net 2005. I have a DataGridView with several columns. One of the columns is a ComboBox. What I want to happen is when I populate the DataGridView by binding it with the DataTable I want the ComboBox item that is in the DataTable field to be the one that is shown as selected in the drop down. Then if the user wants to change the value they select a different one from the DropDown (and I will perform some update action). My code displays the correct DataTable item in the ComboBox, but the ComboBox will not drop down so a different item can be selected.
This is the code where I set up the ComboBox in the Form_Load and add all the possible items that can be in the DataTable Destination field.
c10 = New DataGridViewComboBoxColumn
c10.Name = "Destination"
c10.DataPropertyName = "Destination"
c10.MaxDropDownItems = 5
c10.Items.Add(" ")
[Code] .....
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Jan 22, 2010
I have a dropdown where the items initially are filtered (using a SQL Datasource) based on the selection of another dropdown; however, I have included a checkbox where if checked, the dropdown needs to populate with all data from another datasource How do I programatically remove a datasource that is bound to a control and then define another?
I have the following code, but it errors:
If cbOverrideArea.Checked Then
Me.ddArea.Items.Clear()
[code].....
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Aug 5, 2011
I am developing a VB.NET ASPX file in VS 2008. I am having trouble retrieving the selected input parameters however. This is real simple problem. Here is my current code:
[Code]...
This is a really basic question. This code currently sets the dropdownlist like I want, but just doesn't return selected month and year. How can I fix this?Note that Main2 sub is for PostBack = True.
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Jun 21, 2009
Dropdown menu IN tab control?
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May 2, 2011
All of my pages are built dynamically in code behind pages (I think thats the correct terminology (?), I load a series on HTML files then builld the page).
I want to use drop down menu (which will be in my header file). I tried this one: [URL]
When building the menu in frontpage in the html file it was perfect. So I added the ref to the css file in my aspx page but rather than allowing for the drop down option is just displayed all options (although the formatting remains as per the stylesheet).
Is there a script or a well known method out there for HTML drop down menus that will work when loaded into an aspx page?
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May 24, 2012
For this project I am using Visual Basic in Visual Studio Professional 2008 and SQL 2005 Express.
I have a table in SQL 2005 Express with 4 columns. These are ID, ProductCode,ProductDescription and Price all included in a dataset called ProductsDateSet. The ID column is obviously an integer and the primary key. The ProductCode and Description are both nvarchar(50) and the price is a money column.The table is called Products.
Initially this DataSet is used to enter product information into the database in Form1 but it is also used on a second VB Form (Form2) resembling a sales invoice. [code]...
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Sep 24, 2009
How can i have a dropdown with checked listbox in vb.net??
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Sep 8, 2010
Dim oControl As New Forms.Control()
Using types As New DataSet
With oDal
.Parameters.Clear()
.Execute(sql, types)
[Code] .....
For some reason when you click the dropdown - "0" is displayed defaulted. It needs to be the first text/value pair from the table. The table is only returning one row at the moment, which is correct, but 0 still defaults.
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Jan 26, 2012
How to get a list of the files that were added to the resource file so I can add them to a dropdown list?
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Apr 22, 2009
Check this code. Here I populated Dropdown with volumenames from webconfig file. Here I am getting volumename from webconfig file and in page load event I want to show this volumename selected.
'page load
Dim volumeName As String = ConfigurationManager.AppSettings("VolumeName")
Dim index As String
If Me.ddlVolume.Items.Count > 0 Then
'DropDownListName.Items(DropDownListName.SelectedIn dex).Value
[Code] .....
Here I am getting the error: Conversion from string "TEST" to type 'Integer' is not valid.
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Aug 5, 2011
I have a dropdown bound to a datatable. I'm trying to insert a new item at position 0, but when the control is loaded, I don't see the new listitem or any errors.
Public Sub Page_Load(ByVal sender As Object, ByVal e As eventargs) Handles Me.Load
If Not Page.IsPostBack Then
loadRegistrantAbstracts()
[Code] .....
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