VS 2010 - DropDownList On Website
Apr 13, 2012
I have a drop down list on the website I'm currently working on and would like to filter the results displayed based on the logged in user.An example of what I'm wanting to do is, lets say Jane's logged into this site when she clicks onto the drop down list it will only display items based upon what is associated with her login name on the table I'm pointing this drop down list to. I'm linking this drop down list up using a Linq DataSource.
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May 11, 2010
I started working on a website using 2010 Express. However, the hosting company that I am using hasn't fully implemented .NET 4.0. I'm wondering if there is a way that I can save my website for compatability with 2008 express. Then I can finish and publis using 2008 Express.
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Feb 13, 2013
I've made a small site which purpose is to allow people to add members to their clan. The page has a dropdown list with the names of all available clans.
The name of the clans and the clan password come from a text file which is read when loading the page (but not when there's a page postback) and adds the clans to the dropdownlist.
The clan name and clan password are also read into an array for later use.
When the user selects an item in the dropdownlist I want to get the index so I know which clan name to use and which password.
I tried getting the index by using the indexchanged event and also just the click event of a button but somehow this doesn't seem to be working properly.
When the user filled in all fields and hits the submit button I want to check if the password is correct and want to know the clanname. I'm trying to do this by using the array's with that data and setting the item of the array equal to the index of the selected item in the dropdownlist.
But when I press the button I keep getting a wrong password error even though it's correct. If I remove the password check and submit it then the form should create or append to a text file with the name of the clan. But when submitted the text files is .txt instead of clanname.txt.
Tried setting the dropdown to autopost back or without and get the same result.
My code is the following:
reading the data into the array + adding the clannames to the dropdownlist
vb Code:
Dim data() As String  Dim clanname(50) As String Â
Dim clanpass(50) As String Protected Sub Page_Load(sender As Object, e As System.EventArgs)
Handles Me.Load    Â
Dim fileName As String = "C:/ClientSites/data/clans.txt"Â Â Â Â
[Code] ....
The submit button code
vb Code:
Protected Sub btnSubmit_Click(sender As Object, e As System.EventArgs) Handles btnSubmit.Click    Â
naam = txtMemberName.Text.ToString    gamertag = txtGamerTag.Text.ToString   Â
platform = txtPlatform.Text.ToString     index = DropDownList1.SelectedIndex    Â
paswoord = clanpass(index) Â Â Â Â Â Â Â Â Â Â Â Â
[Code] ....
In short I load in data from a file into two arrays, clanpass and clanname. Populate the dropdown with the clannames. Then upon submitting I want to check the password against the password for the selected item by using it's index. I also want the name to write it to the correct text file.
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Aug 4, 2010
I have a drop-down list that is dynamically filled with a set of values. By viewing the source code in the browser I can tell that this list is correctly filled with the "value" and "text" parameters.
But if I try to retrieve the value using ddl.SelectedItem.Value I get the error "Object reference not set to an instance of an object" which means that there is no parameter in "value" to retrieve ...
Page_Load() contains an "If Not IsPagePostback" in which the list is filled. I don't want to use AutoPostback = True since I want to retrieve the value-parameter when I click a "save" button. I must have missed something fundamental here that I do not grasp ...
The code to fill the list looks like this:
Code:
Dim ds as Dataset ()
ds.ReadXml(the path to an xml file)
ddl.Items.Add(New ListItem("destination", "destination"))
ddl.DataSource = ds.Tables(0).DefaultView
ddl.DataBind()
This snippet does not generate any errors: Everything is printed as it should!
But inside my Submit function I cannot be retrieve the parameter:
Code:
objcmd.parameter.add("?destination ", OdbcType.VarChar).Value = ddl.SelectedItem.Value
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Apr 19, 2012
I'm trying to add a time to my database that a user picks from a drop down list but it's proving problematic. Below is the code for the drop down list and the Linq code for adding the selected time to the database.
Drop Down List:
<aspropDownList ID="cboTime" runat="server" AutoPostBack="True">
<asp:ListItem>09:30</asp:ListItem>
<asp:ListItem>10:00</asp:ListItem>
<asp:ListItem>10:30</asp:ListItem>
<asp:ListItem>11:00</asp:ListItem>
<asp:ListItem>11:30</asp:ListItem>
[Code]...
The Error I'm Getting:
Value of type 'Integer' cannot be converted to 'System.TimeSpan?
The datatype is Time in the database.
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Jul 11, 2011
Security of ASP.Net controls. For instance, if I have a DropDownList with 3 selections, when a user submits the form does ASP.Net validate that the value selected from the DropDown is a legitimate value and was not tampered with? For instance, the choices in the DropDown were 1, 2, and 3 but the user manipulated the form data when posting to make the value a 4. Will ASP catch it before it gets to my code behind?
I believe I read somewhere in my travels that ASP.Net has built in security to handle this but I just wanted to verify.
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Mar 17, 2011
I populate the items to the dropdownlist with values from a database. I use the .text and .value properties. It comes out right in the list. However when I try to make a button visible when selectedindexchange or selectedtextchange, nothing happens. Therefor I made the button always visible (because it´s the "add" button to the database depending on the selected item). When clicking Add I realize it´s the same value being sent to the database everytime, ie the first value of the list. So I´m thinking the selected... events isn´t working. Do you know what I´m doing wrong?
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Dec 3, 2013
I am trying to populate (bind with a dataset) a DropDownList inside a GridView. However, when I do my DropDownList.DataSource = dataSet.. I get the following exception ( Object reference not set to an instance of an object. )
Here is my GridView in the .aspx page:
AllowPaging="True" EnableViewState="False">
Here is the code behind...
Private Sub gvTransferNumbersEN_RowDataBound(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvTransferNumbersEN.RowDataBound
If (e.Row.RowType = DataControlRowType.DataRow) Then
Dim dsGetTransferNumbers As DataSet
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[code]....
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Apr 16, 2012
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Apr 7, 2012
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Code:
connExcel.Open()
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oda.SelectCommand = cmdExcel
oda.Fill(dt2)
connExcel.Close()
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dropdown1.DataBind()
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Jul 21, 2011
I am binding Dropdownlist from sqldatasource. Is it possible to check conditions with Dropdownlist on each item bound, based on the select command.
Code:
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SQLDataSource1" DataTextField="emp_name" DataValueField="emp_id"></asp:DropDownList>
<asp:SqlDataSource ID="SQLDataSource1" runat="server" ConnectionString="<%$ConnectionStrings:ConnectionString1 %>" SelectCommand="select emp_id,emp_name,status from emp_master"></asp:SqlDataSource>
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Dec 27, 2010
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Jul 6, 2010
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Dec 12, 2010
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Nov 19, 2011
We have a site that was scraping a site to gather all models available of a product. The 3rd party site recently changed the website so it now uses ajax for users to select the manufacturer and then once they select that it loads a dropdown with products using ajax.
I currently was using httpwebrequest for all requests (see below).
Code:
Public Function fnRequest(ByVal sPOSTData As String, Optional ByVal bAutoRedirect As Boolean = False) As String
Dim uriSite As Uri
Dim sReturn As String
Dim srReader As StreamReader
Dim sTemp As String
[Code] ....
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Aug 23, 2012
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May 8, 2012
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Sep 27, 2011
I just created a download counter on my website that increments when a download link is clicked. It also records the times of the downloads in a database. Along with that I was wondering if I could gather some general information about location of the visitor to my website that clicked the download link. Is there a way to do that? Maybe you're not supposed to try to get overly specific data because that would be a sort of invasion of privacy but if I could collect something that would tell me an approximate location of the visitor to my website that clicked the download link that would be nice if that can be gotten without too much trouble.
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Aug 27, 2010
I am using code I have always used in other version of VS for binding to a list box.
After binding a dataset to a ListBox in VS 2010, render the page, and cilck any item in the list, the on change event always goes back to the first item in the list!
The following code to run the list box runs once...
if (!Page.IsPostBack)
DataSet ds = UWA.AWHWebServices.GetAllBranches();
LBCSC.DataSource = ds;
LBCSC.DataTextField = "BUSN_ROLE_NM";
LBCSC.DataValueField = "BUSN_ROLE_TYP_CD";
LBCSC.DataBind();
Now instead if I load the list box using Items.add, render the page, and then click on any item in the list I get the correct item selected.
for (int i=0;i<ds.Tables[0].Rows.Count; i++){ LBCSC.Items.Add(ds.Tables[0].Rows[i] "BUSN_ROLE_NM"].ToString());}
Is this a VS 2010 Bug?
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May 4, 2010
as the title says - can I create a .net 3.5 website in Visual Web Developer 2010?
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Dec 18, 2010
I have two websites both of which will share the same users in a SQL DB for membership. The first site is the standard site while the other is a subdomain for admins.
If the admin logs onto the either site, I don't want that person to have to re log on to either site if he/she is sent there via navigation. To the user it would just seem like one site. Because user would be using same session, if they log off either site they would have to reauthenticate.
How would I go about passing this information?
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Feb 15, 2011
Recently, I added a massive amount of new languages (as RESX files) to an ASP.NET Web Site project in VS.NET 2010.
The project has approximately 50 ASPX pages and did build rather fast, before I added the languages.
Since the languages were added the compiler takes several minutes (well, at least 1-2) until the browser sees a page.
Now I'm currently investigating, whether I could speed up compilation time inside my development environment. I can think of:
Leaving out the RESX files in VS.NET and copy them from another, external folder, when deploying to the web server, only.
Change the project type from Web Site to Web Application.
My question:
how you would improve development speed of a large multi-language website in ASP.NET 4.0?
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Sep 29, 2010
When I start a new ASP.NET project in Visual Studio 2010, I can either create a new ASP.NET Web Site or an ASP.NET Web Application. What's the difference between these two project types? Why would I choose one over the other?
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