ADO.NET :: How To Populate Dropdown Using LINQ
Dec 1, 2010
i am trying to use LINQ to populate a drop-down. This code works fine on my local machine, but I get an error when I try to run it on the live site.
The error occurs on this line: ddTicketMasterRoles.DataBind()
The error message is:
.Read_VB$AnonymousType_0`2(System.Data.Linq.SqlClient.Implementation.ObjectMaterializer`1<System.Data.SqlClient.SqlDataReader>)
Description:
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.MethodAccessException:
[code]....
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Oct 6, 2010
I am struggling to create a webservice method using LINQ technology and to populate a dropdown in a form. Here is the Webservice code.
[WebMethod]
public
string[] GetAllCountries()
{
LinqClassesDataContext db =
new
LinqClassesDataContext();
var q =
from c
in db.ListContinents()select
c;
return q.ToList() ;
}
And here is the form code behind
protectedvoid
Page_Load(object sender,
EventArgs e)
{
WSClass WS =
new
WSClass();//bool
ds = WS.GetAllCountries();
var v = WS.GetAllCountries();
ddlContinent.DataSource = v;
ddlContinent.DataBind();
}
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Mar 16, 2011
Here is my Controller:
public class MatchManagerController : Controller
{
//
// GET: /MatchManager/
public ActionResult Index()
{
return View();
}
public ActionResult CreateMatch()
{
return View();
}
}
Here is my View:
@model MatchGaming.Models.MatchModel
@{
ViewBag.Title = "CreateMatch";
}
CreateMatch
@using (Html.BeginForm()) {
@Html.ValidationSummary(true).....
I want my MatchTypeId to be a drop down that populates from my table MatchTypes.
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Sep 23, 2010
I am wondering into the unknown field of OOA and was looking for a way to separate my business logic from my UI. A small example is as followed:
Two DropDowns where the second one is depended on the selection in the first DropDown. You have Cars, planes, etc. inm the first DropDown and Toyota, Chrysler, etc in the second (depending on the value in the first DD.I have som Lin syntax. The file is situated in the App_Code folder and NOT as code behind. [Code]....
I would like to know how i can make populate my second Dropdown list with results. At this point it's just putting in the complete ProductSubCategory.
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Mar 4, 2011
I have a gridview where i have two fields. one is product and second is sub category.
I need to do 2 things.
1. I need to populate the two combos from the database. But depending what is selected in dropdown 1 this will determine what needs to be populated in drop down 2?
how can i achieve this?
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Mar 11, 2014
I have seen article in code snippet but i have never used web services so that is complicated .
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Oct 22, 2010
how to populate a dropdown list box based on selected value in another.
dropdown list box? Say, for example, the first dropdown is a list of car manufactures. When a user selected a manufacture from that dropdown list, the second dropdown would list would automatically gets populated with all the car models for that manufacture.
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Dec 9, 2010
I have a dozen tables, and two dropdown lists.The first drop down list shows the table names. The second dropdown list needs to be poulated with the data from the specific table selected in the first dropdown list.I wrote a stored procedure that will query the selected table name choosen in the the first dropdown list. My results though are only showing this...
[Code]....
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Jan 18, 2011
Is there a simple code to populate a dropdown box using Enterprise Library 5.0 DAAB? I've tried this, but it is not working:
cmbOffice.DataSource = _db.ExecuteDataSet(
CommandType.Text,
"select office_id, office_name from office").Tables[0];
cmbOffice.DataBind();
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Feb 27, 2011
I've spent a lot of time trying to figure out how to do a drop down for filters. Right now I have two filters as a textbox but I want a dropdown list instead as I would be adding few more filters. This is my index page:
Task List
<ul>
<% using (Html.BeginForm("Index", "Task"))
{%>
<fieldset>
<legend>Filters</legend> [code].....
This is the change I made in my Model:
public class FilterViewModel
{
public PapClientProfile Client { get; set; }
public PapStaff Physician { get; set; }
[code]...
But I'm not able to populate any dropdown values.
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Nov 15, 2010
how to populate a drop down listbox (dlName) from a web service with last and first name i.e. (LastName, FirstName). My Web Service XML that I am requesting is as follows:
<?xml version="1.0" encoding="utf-16"?>
<FindPartnerContactsAction xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<CompanyName>training</CompanyName>
<IntegrationLoginId>cscw</IntegrationLoginId>
[Code]....
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Jun 23, 2010
Just upgraded to VWD2010. I created a skin file and put it in App_Themes. I created a skin id for a couple of controls: gridview, dropdown etc. Normally in the properties you can go to skinid and a drop down with the skin id shows up and you can select it. Thats not happening. Also, if I put my skinid in for the skinid property of the component its not displaying the formating at all. For example: Here is what I have for a gridview in my skin file named /App_Themes/Default/Default.skin
[Code]....
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May 26, 2010
i've run into small problem, here's the thing: i've got a dropdown list (ddlist1) that i am populating from a database, that works fine. However, depending on the option selected here, i need to populate another dropdown list (ddlist2). for example, if on ddlist1 i select option 1, on ddlist 2 i should get a list of options related to option 1 from ddlist1. If i select option 2, on ddlist 2 i should get a list of options related to option 2 from ddlist 1. and so forth. this information with which ddlist needs to be filled, comed from another database. o how can i go about this? m not sure yet how to code the second ddlist.
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Aug 25, 2010
I want to populate the cascading Dropdown values without Promttext.
Scenario is .If a single value is retrived from the database then I think no need to populate the promt text. It may populate only that value and call the next function from the inside of it. Can it be possible using web methods.
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Nov 5, 2010
I have an improvised system to enter data, below the gridview. I need to populate one dropdown only with the values which relate to the value selected in the drop down before that. For example. I have a dropdown for Customers and another for ShipTo. I want Shipto dropdown to populate only with the values which relate to the particular Customer selected.
[Code]....
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Mar 2, 2010
i have 3 dropdown list box 3rd dropdown populate depending on 2nd drop down and 2nd drop down populate depnding on 1st value of drop down in asp .NET C#
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Nov 17, 2010
I have a dropdown list with the names of the months listed in it. These names are stored as int values but converted to string for display purpose. I also have a RadDatePicker control that will allow the user to select a specific date to overwrite the default date. The default date in the textbox needs to be set to the last day of the month selected (i.e. May 2010 would default to 05/31/2010).
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Nov 18, 2010
how do i initaize array in just one line so that dropdown list can be populated easily.
For eg : arr={"1","2","3"} how do i do this for list items in dropdown list.
I know this method:
Dim a(1) As ListItem
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Oct 4, 2010
I'm stuck with a problem to populate a DropDownList control with values from the database using item field template in read only mode. since I'm new to ASP.NET. Below is the code and the error I'm getting:
'PictureReadOnlyCategories' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentOutOfRangeException: 'PictureReadOnlyCategories' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value
The code for this is :
<asp:SqlDataSource ID="categoriesDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand ="SELECT [CategoryID], [Name] FROM [Categories] WHERE ([UserId] = @UserId)">
<SelectParameters>
[Code]....
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Oct 6, 2010
I wanted to know the best practice for caching data. Say I have some control example a dropdown list which is populated from my db. Now this dropdown is global and used across many pages. I was thinking of not going to database everytime to fetch data for this dropdown and put the result in Cache. And then populate this dropdown from cache. Is this a good practice or if there is another approach. Can I store my datareader in cache and then use it globally. Also could I do this in application start event?
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Feb 9, 2012
any way to populated dropdown from database at client side
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Nov 19, 2010
after
[Code]....
This line i get an error. Means nothing is populating there and no method is calling in .cs page too.in the script it returns error. my .cs page code for populting first dropdown as follows,
[Code]....
and the webmethod as follows
[Code]....
[Code]....
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Feb 8, 2011
I'm trying to populate a dropdown list with a list of all the usergroups in existence in an existing active directory.
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Oct 7, 2010
I need getting a drop down list selection to populate a calendar. The user selects a vehicle from the dropdownlist and based on that selection, the calendar needs to populate a link with drivers names on whatever days the vehicle is rented out for.
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Oct 6, 2010
I have an application as: SelectCommand="SELECT [CategoryID], [Name], [UserId] FROM [Categories] WHERE ([UserId] = @UserId) ORDER BY [Name]">
</asp:SqlDataSource>
Pick a category: <asp:DropDownList ID="categories" runat="server" AutoPostBack="True"
DataSourceID="categoriesDataSource" DataTextField="Name" [code]...
When i take away the <SelectParameters>
<asp:QueryStringParameter Name="CategoryID" QueryStringField="ID" />
</SelectParameters> and ([UserId] = @UserId), the dropdown list control will populate values from the database but when i live those 2, it won't populate any value from the database. When i remove the <asp:QueryStringParameter Name="CategoryID" QueryStringField="ID" />
</SelectParameters>,and live ([UserId] = @UserId), i get the error : Must declare the scalar variable "@UserId".
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