C# - Binding List Variable One After Another?

May 13, 2010

this is my class

[code]....

hope my Question is clear.

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List <myClass> listName=new List<myClass>

OnClick:

listName.add(3);
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[code]....

I get the error: Unable to cast object of type

'System.Data.Linq.DataQuery1[VB$AnonymousType_111[System.Guid,System.String,System.String,System.String,System.String,System.Nullable1[System.DateTime],System.Nullable1[System.DateTime],System.Nullable1[System.Guid],System.Nullable1[System.DateTime],System.Nullable1[System.Guid],System.Nullable1[System.DateTime]]]' to type 'System.Collections.Generic.IEnumerable`1[Ten11CRMLib.Company]'.

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I am trying set up a simple dropdown list but I dont seem to be able to get it to bind to the Model. I am using Asp.Net MVC and nhibernate.

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MVC :: Binding Drop Down List From ViewData?

Mar 11, 2010

I keep getting this error and i just can't figure it out:

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[Code]....

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I am trying to bind the gererist list type to GridView control but for some reason its just displaying "Member"(Object name) rather then the actuakl content inside object.Any Idea why?Below i have decleared a List Type Member:

[Code]....

And the Below trying to bind with gridview:

[Code]....

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[code]....

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Web Forms :: Binding An Array To Dropdown List?

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I have the following string which is a list of urls. How do I get this to work so the url shows for the selection and also is the value?

[Code]....

ArgumentNullException: Value cannot be null.
Parameter name: container]
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C# - Binding A Column Within A Generic List To GridView?

Mar 15, 2011

i tried reading all the articles and tried the solutions as well did not work for me.

One of the solutions i tried

Binding Generic List Array to GridView.

The new project file that I created using your tweeked sample code is below:

[code]....

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Aug 4, 2010

one drop down list cointains all country list ,when we select thet particular country the other drop down list has to show all the states in that country ,this is what i am thinking to do ,can some one guide me how to do ,and give you give some reference links

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ADO.NET :: Binding Data From Database To Drop Down List Using EF?

Jan 12, 2011

I have a table Person (in my database) which has fields like PersonID, PersonName, PersonSurname, etc. What I'd like to do is to bind the PersonName + PersonSurname (e.g. Mark Black) as values for displaying the data in drop down list and PersonID as the data identifier.

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I am using HTML dropdown list and binding it from ViewData ,but how i can get selected value in controller.

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Jun 23, 2010

I have a Gridview that displays paged results from a search query. The problem I am having is that the gridview is not displaying all the results returned from the query. For example, I can step through the code and see 6 items returned by the call to GetList(), but only 2 rows get rendered by the gridview after binding.

I am using an ObjectDataSource created in code:

ObjectDataSource ods = new ObjectDataSource();
ods.EnablePaging = true;
ods.TypeName = "Bll.InvestmentProductSvc";
ods.DataObjectTypeName = "Bll.InvestmentProduct";
ods.SelectMethod = "GetList";
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ods.SelectParameters.Add (new Parameter("SearchString",TypeCode.String, SearchString));
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The Gridview declaration:

<asp:GridView ID="gvSearchResults" runat="server" AutoGenerateColumns="False" AllowPaging="true" PageIndex="0" PageSize="50" OnPageIndexChanging="gvSearchResults_PageIndexChanging" PagerSettings-Position="TopAndBottom">
</asp:GridView>

Are there any reasons for the Gridview not to render a row and not to report an error? I have examined the data returned for the 6 items and cannot find any distinctive differences between the 2 rows displayed and the 4 rows not displayed.

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C# - Binding To A List <string> Using DataBinder.Eval?

Sep 3, 2010

I have the following object:

CrossTabDataObject
{
string RowName{get;set;};
int RowId{get;set;}
List<string> CellContents = new List <string>();
//Constructor..... etc.
}

I'm building a dynamic crosstab grid using GridView in asp.net 3.5

I wish to bind to CellContents[0] for dynamic column 1, CellContents[1] for dynamic column 2 (dynamic column 0 is the RowName field from the CrossTabDataObject) etc. I am using:

object boundValueObj = null;
Control ctrl = (Control)sender;
IDataItemContainer dataItemContainer = (IDataItemContainer)ctrl.NamingContainer;
boundValueObj = DataBinder.Eval(dataItemContainer.DataItem, strSelectedID);

This code is in the InstantiateIn function of the gridview as I'm creating drop down list templates in each cell of the crosstab.

I have code (not shown) that sets strSelectedID depending on the column being created.

When strSelectedID is equal to "RowName" for dynamic column [0] the DataBinder.Eval function works fine and sets boundValueObj as expected. The problem comes when strSelectedID is set to "CellContents[n]" where n is the Column Index.

DataBinder.Eval only works with properties and fields of objects. How do I get around this?

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DropDownList Data Binding To List <String> Not Working?

Oct 22, 2010

I'm trying to bind a List<String> to a DropDownList in a user control. I think I'm doing the right thing, but it seems that after my code executes the bindings are cleared. Here's the code for review!

User control:
<asp:DropDownList ID="subjectNameDropDown" runat="server"/>
<asp:DropDownList ID="yearLevelDropDown" runat="server"/>
Auto-generated designed code-behind:
public partial class NewSiteMetadataUserControl {
protected global::System.Web.UI.WebControls.DropDownList subjectNameDropDown;
protected global::System.Web.UI.WebControls.DropDownList yearLevelDropDown;
}
Code-behind:
public partial class NewSiteMetadataUserControl : UserControl
{
protected override void CreateChildControls()
{
subjectNameDropDown = new DropDownList();
yearLevelDropDown = new DropDownList();
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
EnsureChildControls();
// Attempt 1
List<String> subjectNames = GetSubjectValues();
foreach (var subjectName in subjectNames)
subjectNameDropDown.Items.Add(subjectName);
subjectNameDropDown.DataBind();
// Attempt 2
List<String> yearLevels = GetYearLevelValues();
yearLevelDropDown.DataSource = yearLevels;
yearLevelDropDown.DataBind();
}
}

Should this approach work? If it should, how can I debug what happens after the code executes?

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Populating DataKeyNames When Binding Generic List To Gridview

Feb 15, 2010

I have a generic List which is populated with an object which has properties like FirstName, Surname etc.

If I bind a gridview to the list with autocompletecolumns = true, the Gridview displays the data in the List.

The code looks like:

[code]....

My question is:

How do I populate the DataKeyNames with the properties (FirstName, Surname) contained in the object that is contained in each element of the Generic List?

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C# - Binding A Generic List Of Type Struct To A Repeater?

Aug 19, 2010

I've had a bit of a problem trying to bind a generic list to a repeater. The type used in the generic list is actually a struct.

I've built a basic example below:

[code]....

I then create two fruits using the struct (apple and orange). These fruits are then added to the list.

Finally, I bind the generic list to the DataSource property of the repeater...

The markup looks like this:

[code]....

I expect to see the fruit name and price printed on the screen, separated by a horizontal rule.

At the moment I am getting an error relating to actual binding...

**Exception Details: System.Web.HttpException: DataBinding: '_Default+Fruit' does not contain a property with the name 'FruitName'.**

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Web Forms :: Binding Data To Dropdown List From Database

Jul 7, 2010

I am not able bind data to the dropdownlist from database. following is code.

DataTable dtModule = BO.GetBizModel_DDL(ServiceID);
if (dtModule != null)
{
ddlBizModl.Items.Clear();
ddlBizModl.DataSource = dtModule;
ddlBizModl.DataTextField = "BIZ_MODL_NM";
ddlBizModl.DataValueField = "BIZ_MODL_ID";
ddlBizModl.DataBind();
}
dtModule.Dispose();

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Dropdown List Binding From Database Using Java Script?

Jan 4, 2011

web form (table) with 32 dropdown fileds.paging implemented (100 rows per page)populate down button next to each controlfreeze pane implemented for first three columnsWorkinguser will change values of each drop down at runtime inorder to update the information in database.when populate down button is clicked, all the dropdown values below will be replaced with current selectio

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AJAX :: Dropdown List Not Binding With CascadingDropDown Extender?

Jun 21, 2010

I am trying to create a cascading dropdown list using two dropdown lists in Visual Studio 2008 Professional connecting to a SQL Server 2008 Standard database on my local machine. I have added the two dropdown lists, as well as a CascadingDropDown extenders from the AJAX Control Toolkit that corresponds with the first dropdown list. The problem I am running into is that despite the fact that I have a CascadingDropDown extender for the first dropdown list so far, and the extender is configured properly, the first dropdown list is showing Unbound in Design view. I also don't see a TargetControlID entry in the properties window for the externder.

I hard coded the TargetControlID to the extender in the Source view and, although I am not receiving any dynamic errors from the TargetControlID entry (meaning, the TargetControlID is a valid parameter, and the dropdown list I entered for that parameter exists on the same page), the dropdown list doesn't populate properly and when in Design view, not only do I not see an entry for the CascadingDropDown extender, but the target dropdown list shows as being "Unbound."

A couple of things I want to point out first:

1) I am using Master pages on this site for the header, footer and navigation. The opening and closing <form> tags, as well as the <ScriptManager> entry are in the Master page, not the content pages. I did this with the assumption that at runtime, each page would have the proper <form> tags and <ScriptManager> entry to function properly.

2) I have been able to add a CascadingDropDown extender to a page in Design view (and it initially displays properly), but by the time I have added all of the properties settings to apply it to its corresponding dropdown list, the entry appears normal in Source view but no longer appears in Design view. When I run the page, the dropdown list does not populate. Obviously, I assume that this is related to the dropdown list showing in Design view as being Unbound, but I don't know how to get the dropdown list to recognize that I have a CascadingDropDown extender that is supposed to apply to it.

Here is what the two elements look like in Source view:

<asp:DropDownList ID="ddlCompany" runat="server">
</asp:DropDownList>
<ajaxToolkit:CascadingDropDown ID="cddCompanies" runat="server" TargetControlID="ddlCompany" Category="Company" PromptText="Select a Company" LoadingText="Please Wait..." ServicePath="~/CompaniesService.asmx" ServiceMethod="GetCompanies">
</ajaxToolkit:CascadingDropDown>

To create these, I have been following Joe Stagner's example in his video on the topic (http://www.asp.net/ajax/videos/use-aspnet-ajax-cascading-drop-down-control-to-access-a-database) virtually word for word. I have set up two TableAdapters/DataSets, one for each dropdown list, and the datasets are able to accurately pull the appropriate data from the database, so I know those are working properly. I believe the problem is that the dropdown list isn't binding with the CascadingDropDown extender properly. It wouldn't bother me that I don't see a TargetControlID entry in the properies window for the CascadingDropDown extender, although I have a feeling that the absense of that property is related to the fact that the dropdown list is not binding to the extender. I searched online for causes to this problem, but I wasn't able to find any solutions.

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