Web Forms :: C# Getting Listbox Selected Item Without Using System.Windows.Forms As Need To Use System.Web
Feb 4, 2011
im tryign to move a listbox item from one listbox to another heres my c# for moving from populated listbox to unpopulated
[Code]....
when i run the addtable function on one of my buttons it doesnt work, so i tried just outputing to a label the value of the slected item, didnt work
i opened google chrome console to find the below which led me to belive i need to add System.Windows.Forms; to get it working?
ScriptResource.axd?d=eapqzlwXhBFph23Pl_2pOrzTVt5-WN-w1AJhJtJAxUGjg5h6xiIW5VowmUQ2aKwAieU-I4882cg5dWnZWQpkyvximpbl-emU1vXDRe137NMq7e8sEJ6W-wJLYpPH8ryr7g79lqLpeL1CaNGbVvthubXLUxDQz86JoZP_jf82s1h2aflGevqjjph2odUMt3SI0&t=2610f696:868Uncaught
Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException:
Object reference not set to an instance of an object.
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Feb 28, 2011
How to get the selected item from the listbox in the selected index changed event. I tried: Label1.Text = ListBox1.SelectedItem.Text; It is giving me object set to null reference.
foreach (ListItem item in ListBox1.Items)
{
if (item.Selected)
{
//lblResults.Text += item.Text + "
";
Label1.Text = item.Text;
}
}
No use, no value coming in to label.
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Aug 31, 2013
Error 1 'System.Data.OleDb.OleDbDataReader' does not contain a definition for 'Item' and no extension method 'Item' accepting a first argument of type 'System.Data.OleDb.OleDbDataReader' could be found (are you missing a using directive or an assembly reference?)
public partial class Default2 : System.Web.UI.Page {
System.Data.OleDb.OleDbConnection Con = new System.Data.OleDb.OleDbConnection(System.Web.Configuration.WebConfigurationManager.
ConnectionStrings("MyConnectionString").ConnectionString);
protected void Page_Load(object sender, EventArgs e)
[Code] .....
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Aug 3, 2010
All i did is added an existing webform from vs 2003 project to vs 2008. with Listbox1 control this error is appearing. value of type system.web.ui.webcontrols.listbox cannot be converted to "myprojectname.listbox"
i also have the control defined on the top: Protected WithEvents Listbox1 As System.Web.UI.WebControls.ListBox I have converted lot of pages which were used in vs 2003 to vs 2008 without any problem, also tried to right click teh webform and go to code gen file , but the file is not coming up.
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Mar 23, 2011
if any body select listbox then
item=item1
if nobody select list box
item=no
how to do it
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Aug 3, 2010
regarding this scenario..
I have a listbox, i am binding it to a datatable with DataTextField and DataValueField. This is in WebForm (not windows).And the first item in ListBox is "Select All" and the rest are from DataTable.SelectAll is selected by default.1) If i select any other item...(as it is multiselect) the "select all" item should be unselected.2) If i select 5 items in ListBox and after that i select "Select All" items then all the other items except "Select All" item should be unselected.
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Nov 4, 2010
I have built one of those 2 listbox things where the items in the left textbox can be selected and moved to the right list box. The items in the list can be thought of as tasks (like Raise Invoice, Call Client, Deliver goods etc) The rules of this are that the item you move to the right box remains in the left box. Reason being, you are allowed to add the same item from the left to right as many times as you like. An example what the list on the right might look like is this.
Raise Invoice
Call Client
Deliver Goods
Installation
Call Client
Finalize Deal
Now I have added the feature to select an item on the right and hit the UP button, to move it up in the list. For example I could select 'Deliver Goods' and hit the up button. (the down button works as expected)
Raise Invoice
Deliver Goods
Call Client
Installation
Call Client
Finalize Deal
If i select the 2nd instance of Call Client and hit the up button,
Raise Invoice
Call Client
Deliver Goods
Installation
Call Client
Finalize Deal
This is what happens.
Raise Invoice
Call Client
Deliver Goods
Installation
Call Client
Finalize Deal
My code that loops though and does the move relies on the item.selected property to find which on I have selected. (obviously)
[Code]....
Despite having the items at the bottom of the list selected, the .Selected property is true on the first instance of the item that happens to have the same .Text and .Value.
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Oct 13, 2010
I have a asp.net web form in which I display registered customers in a listbox. In the listbox I can choose one customer, and click a "Show data"-button. That should display all registered data about the chosen customer in textboxes next to the listbox. This doesn't work and I haven't been able to find where the error lies. Instead of displaiyng the data in the textboxes the error message in: LabelNoCustomerChosen is displayed. Could it be that the program doesn't find the customer ID? The string that is displayed in the listbox looks like this: ID Lastname, Firstname
[Code]....
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Nov 19, 2010
I used using System.Windows.Forms; to display message (MessageBox.Show("")). When I move the same site to IIS I am getting the following error:-
Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.
How can I show message box after moving my website to IIS?
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Mar 10, 2011
I want to change the selected listbox item back color. How can I achive this. I tried using ..
protected void lstbxApplications_SelectedIndexChanged(object sender, EventArgse)
{
try
{
lstbxApplications.SelectedItem.Attributes.Add(
"style",
"background-color:Green;
color: Red;"
);
}
catch
(Exception
)
{
throw
;
}
}
But this seems not working.
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Nov 7, 2010
I want to cast back my ListBox Item into my Business Object. Following is the code. ListBox Populate Code on Page Load...
if (!Page.IsPostBack)
{
SalesDBEntities ctx = new SalesDBEntities();
this.ListBox1.DataSource = ctx.SalesHistories;
this.ListBox1.DataTextField = "Product";
this.ListBox1.DataValueField = "SaleID";
this.ListBox1.DataBind();
}
And here is
protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
SalesHistory sh = new SalesHistory();
//sh = (SalesHistory)ListBox1.SelectedValue; Error Here. How it is possible
TextBox1.Text = ListBox1.SelectedValue.ToString();
}
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May 7, 2015
i want to display value in textbox when a value is selected in listbox in webapplication vb.net.
Dim con As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:UsersUserDocumentsDatabase4.accdb")
Dim cmd As New OleDbCommand()
cmd.Connection = con
con.Open()
cmd.CommandText = "Select ID,product from List"
' cmd.CommandText = CommandType.Text
Dim da As New OleDbDataAdapter(cmd)
[code]...
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Mar 19, 2013
i am making use of two listboxes. the data from one listbox is transfered to other listbox on button click, bt teh the data which is selected must be added to the table in the sql server. but it is not storing values it is throwing execption...
private void InsertRecords(StringCollection sc)
{
SqlConnection conn = new SqlConnection("Data Source=ABCD;Integrated Security=True");
StringBuilder sb = new StringBuilder(string.Empty);
[Code].....
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May 16, 2013
I Have bind the
CheckedListBox1.DataSource=ds.Table[0];
CheckedListBox1.DisplayMember="Name";
CheckedListBox1.ValueMember="ID"; [intelligence Not Shown in VS But Its working fine for me].
now i want To Find out The Selected Item value in checkedListBox.
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Dec 16, 2010
i work with visual studio 2005 and asp net 2.0. i have a method method as this :
[Code]....
this problem is follow if i run the web method and don't enter a string and a int a receive this message : System.ArgumentException: Cannot convert to System.Int32. ok when i arrive in the method i can check if lists is empty but how i can do if int is NULL because i don't want to returns a error if people run my web method and don't enter the parameters.
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Nov 23, 2010
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Oct 1, 2010
Yeah some people would say "Are you crazy using winforms controls inside asp forms"... and I think they are right. But I would say.. "I'm not the only one!!, take a look" [URL] So... Doing some kind of stuff like the previous link. I did the following:
using System;
using System.Threading;
using System.Windows.Forms;
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{
public partial class Drucker : System.Web.UI.Page
{
private ManualResetEvent mre = new ManualResetEvent(false);
protected void Page_Load(object sender, EventArgs e)
{
Threading();
}
private void Threading()
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Thread t = new Thread(new ThreadStart(GoAhead));
t.SetApartmentState(ApartmentState.STA);
t.Start();
mre.WaitOne();
t.Abort();
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Jan 18, 2011
I have a treeview named Treeview1 with checkboxes. I want the child checkboxes to be checked if parent is checked.
I am trying to use a simple code that I found on msdn :
[Code]....
For some reasons I got this error and I really dont understand why:
Type 'System.Windows.Forms.TreeViewEventArgs' is not defined.
warning BC40056: Namespace or type specified in the Imports 'System.Windows.Forms' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases.
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Feb 8, 2013
Created a windows service for my local system for sending bulk mail and it is working.But the same if the want to access the db which is there in hosted server and want to install it in my local machine to access the db details from the server , is not working. While starting a service , it is stopping immediately. Is it possible to do so?
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Mar 17, 2011
A requirement of a program I am making is that it can 'print' a given URL into a PDF - the server has a PDF printer installed (and is the default printer), so it's just a matter of printing the page programmaticly, and it seems the best way is to use the WebBrowser control - however, I am running into issues
[Code]....
With the above code, I get a script error 'dialogArguments.___IE_PrintType' is null or not an object' in shdoclc.dll/preview.dlg. If I have wb.Print() to somethign like wb.ShowSaveDialog() (or something like that, can't remember exactly), I notice the 'wb' object's document is a blank page, with just <html> tags and named 'about:blank'. But strangely, almost identical code (without the threading bit in the page_load method) works perfect in a normal Winforms based application.
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Nov 12, 2010
I am developing an application of library management system in asp.net. I want to implement item recomender system. when user search any bsook like c# ,the system also show related other books of c# in the botom of page.
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Sep 9, 2010
I have a textbox that searches the listbox below it and selects the text that I types in the textbox. Now although the item is selected in the listbox I have to scroll to the end to see if the item is selected ornot
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Jul 21, 2010
how can i check with jquery that an item is selected or not in listbox?
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Nov 17, 2010
is there an easy way to scroll an ASP.Net ListBox automatically to the first selected Item? The ListBox has SelectioMode="Multiple".
<asp:ListBox ID="LbSymptomCodesEdit" CausesValidation="true" ValidationGroup="VG_SAVE" Height="100%" Width="100%" runat="server" SelectionMode="Multiple"></asp:ListBox>
The ListBox is in the EditItemTemplate of a FormView inside of an UpdatePanel. jQuery is possible but it would be great if there would be an asp.net serverside(or Ajax) way to achieve this because i don't want to use more client scripts than really needed(and this is only a nice to have).
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Mar 11, 2011
In ASP.NET I have a dropdown with some items in it, I have a button and a textbox. I am subscribed to the SelectedIndexChanged event of the dropdown where I pass the new selected index of the dropdown to a struct that converts it's index (via enum) to a string. That string is then gotten through a property in a class to put into the textbox.
[Code]....
Now the problem I have is that, when you click it (the button) the first time, the action get's updated with the current action selected in the listbox, but then when you click the button again WITHOUT changing anything in the listbox, the textbox shows the zero'th item in the textbox, (seems to reset), although it actually hasn't changed at all.
I'm guessing this might have something to do with the postback caused by the button click, which resets the state of the global or something, but I'm not sure. Why is it being reset while the dropdown box is still as I set it the first time?
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