C# - DropDownList: DataTextField, DataValueField - DataEnabledField?
Jun 1, 2010
I'm currently working with a control that inherits from DropDownList (it has some extra functionality that isn't really relevant to this question, but it gives me a nice place to implement the extra stuff I'm gonig to discuss).
We're using data binding, with the DataTextField and DataValueField working absolutely fine. However, I find myself in need of a similar field that will control whether or not the item is enabled. (I've already overridden the RenderContents method of the control so it properly renders non-Enabled items, since DropDownList doesn't do this by default.)
Thus I'd like to know how to override the DropDownList's data binding so it acts exactly as normal, except a further field from each DataSource item is applied to each ListItem's Enabled property.
(NB: the field I'll be binding to isn't a straight boolean, and doesn't have an explicit/implicit cast to boolean, so I'll probably be "passing" it as a string.)
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Similar Messages:
Mar 24, 2011
I have a dropdownlist for which I am loading data from excel. Excel has 2 columns Product and Email. Data in Product column is binding to DataTextField and Email column to DataValueField. The dropdown works fine when email is different for different product but when email has same value for different product then whatever I select, on postback the selected value changes to the first item of the same email value.
Below are the sample data in Excel to show the behavior of dropdown
Example 1. (Drop down works fine for this example)
Product Email
iPad prashanth364@gmail.com
iPhone 3G prashanth364@yahoo.co.in
iPhone4 prashanth364@in.com
Example 2. (In the example below, whatever I select (iPad or iPhone 3G or iPhone4) on post back the dropdown selected value will be iPad)
Product Email
iPad prashanth364@gmail.com
iPhone 3G prashanth364@gmail.com
iPhone4 prashanth364@gmail.com
Example 3. (In the example below, when I select iPad the dropdown works fine but when I select iPhone 3G or iPhone4 on post back the dropdown selected value will be iPhone 3G. Basically, on selecting iPhone4 here, on post back it shows iPhone 3G)
Product Email
iPad prashanth364@yahoo.co.in
iPhone 3G prashanth364@gmail.com
iPhone4 prashanth364@gmail.com
Below is the function where I am loaidng the data from excel to dropdown private void ExtractFromExcelInitial()
{
// Put user code to initialize the page here
// Create connection string variable. Modify the "Data Source"
// parameter as appropriate for your environment.
string ExcelFilePath = Server.MapPath("~/ProductExcel") + "\ProductEmail.xls";
String sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=" + ExcelFilePath + ";" +
"Extended Properties=Excel 8.0;";
[Code].....
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Mar 2, 2010
How to multiple fields in DropDownList DataTextField and DataValueField
[Code]....
[Code]....
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Jun 28, 2010
I am trying to find out if there is an easier way to insert datavaluefield and datatextfied in a DDL.... I have two dropdownlist...the second ddl prepouplates based on the first one. All works now cos i have all my datavaluefield inserted. Now i was woundering if there is a way to caputure the datatextfied too so users can see it instead of seeing the ID alone. here is my code
<
ContentTemplate>
<asp:Button
ID="butAddEntity"
runat="server"
CausesValidation="False"
CommandName="Insert"
Text="Add"
OnClick="butAddEntity_Click"
/>
<asp:Button
ID="butCancel"
runat="server"
CommandName="Cancel"
Text="Return"
/>
<strong>Bank</strong>:<asp:DropDownList
ID="ddlBank"
runat="server"
AutoPostBack="True"
DataSourceID="BankCodes"
DataTextField="BankDirectory"
DataValueField="Bank_number">
</asp:DropDownList>
<strong>Account
Number:</strong>
<asp:DropDownList
ID="ddlAccount"
runat="server"
DataSourceID="RiskfactorDaily"
DataTextField="BalanceInfo"
DataValueField="NoteAccountNumber">
</asp:DropDownList>
</ContentTemplate>
And here is my datasoure and parameter
<
asp:SqlDataSource
ID="RelationShipMerge"
runat="server"
ConnectionString="<%$
ConnectionStrings:SenderoConnectionString1 %>"
ProviderName="<%$
ConnectionStrings:SenderoConnectionString1.ProviderName %>"
SelectCommand="SELECT
BankNumber, NoteAccountNumber, RecordID FROM RelationshipMerge WHERE (RecordID = @RecordID)"
InsertCommand="INSERT
INTO [Relationshipmerge] ([BankNumber], [NoteAccountNumber],[RecordID]) VALUES (@bank_number,@noteaccountnumber,@recordid)"
UpdateCommand="UPDATE
[Relationshipmerge] SET [BankNumber] = @BankNumber, [NoteAccountNumber] = @NoteAccountNumber WHERE [NoteAccountNumber] = @NoteAccountNumber"
DeleteCommand="DELETE
FROM RelationshipMerge WHERE (NoteAccountNumber=@NoteAccountNumber)"
OnSelecting="RelationShipMerge_Selecting">
<UpdateParameters>
<asp:Parameter
Name="BankNumber"
Type="Int32"
/>
<asp:Parameter
Name="NoteAccountNumber"
Type="String"
/>
<asp:Parameter
Name="recordid"
Type="Int32"
/>
</UpdateParameters>
<DeleteParameters>
<asp:Parameter
Name="NoteAccountNumber"
Type="string"
/>
<asp:Parameter
Name="RECORDID"
Type="int32"
/>
</DeleteParameters>
<InsertParameters>
<asp:Parameter
Name="bank_number"
Type="String"
/>
<asp:Parameter
Name="noteaccountnumber"
Type="String"
/>
<asp:ControlParameter
ControlID="GridView4"
Name="RecordID"
PropertyName="SelectedValue"
Type="Int32"
/>
</InsertParameters>
<SelectParameters>
<asp:ControlParameter
ControlID="GridView4"
Name="RecordID"
PropertyName="SelectedValue"
Type="Int32"
/>
</SelectParameters>
</asp:SqlDataSource>
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Nov 23, 2010
I have used a webservice to populate a Rad Combo Box, when the page is loaded, I need the ability to display the DataTextField, based on the returned DataValueField item
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Jul 9, 2010
I have 2 listboxes....
Listbox1 has
DataTextField="Category"
DataValueField="CategoryID"
(coming from Dropdownlist)
I want to move a Item (a Category) from listbox1 to listbox2...but how do I move this Category Plus the CategoryID to lisbox2 (CategoryID should not be visible but still be associated with Category in Listbox2)
So I want the newly added Categories to be visible in Listbox2 ..but their CategoryID's must be invisible...but still be associated with their Category....
and when I save these Categories from Listbox2 to the Database.....its should be the CategoryID's that should go into the Database.....not the actual Category
So to explain again in a different way
I want to Move a selected DataTextField & its DataValueField from Listbox1 to listbox2
then only the array of DataValueField must be saved to Database
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Feb 5, 2010
I have a list <Department> say Company.Departments with object Manager and ManagerId, ManagerName as property of Manager. I would like to fill the dropdownlist with managers as below
ddlManager.DataSource = Company.Departments;
ddlManager.DataTextField = "ManagerName";
ddlManager.DataValueField = "ManagerId";
Is there a way to specify the property of an object in DataTextField or I need to copy a Manager list for the DataSource?
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May 13, 2010
In Asp.Net 3.5, it is possible that the DataValueField is a IList ?
myddl.DataValueField = "ListOfId"
where ListOfId as a IList in my DataSource
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Nov 20, 2010
[Code]....
I've used DataValueField = "ID".
How do I get an ID in DropDownList?
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Mar 27, 2010
Is there a way to display several records in the datatextfield in a asp dropdownlist? I know the fix when populating the dropdownlist from a datagrid was to edit your SQL query but the values I am receiving are sent via an XML string. The idea would be to display a name, price, and date in the dropdown text. Currently I am getting the following error: DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'MonetaryValueServiceType' While using UPSDropDown.DataTextField = "MonetaryValue" & "ServiceType" Is there a work around to do this? The only other option is to use radio buttons (which are also a nightmare).
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Apr 30, 2010
So I have a major issue and cannot find any solution online to solve it excepting one that is singlistviews. But i am also encounting some probs with listviews since i am not sure of to use it.Anyways so my major issue is that I have drop down lists that are being populated by a sqldatasource. Users are filling out a form selecting values in the drop down list which is fine, the prob exists with editing a record. I have the dataValuefield to be the Id of the data and the selected item in the dropdownlist id is being stored in a database. So I have the data in the database that is the Id of the selected item however I cant use the dropdownlist1.selectValue ='idNo' since that only works with listitems.
How can i access the dynamic rows in a dropdownlist that is being populated by a sqldatasource and set the selected item to a particular item?Any insight is greatly welcome. Even how to use listviews
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Oct 29, 2010
I have a State class defined like this:
Public Class State
Public Property StateId As Integer
Public Property Name As Dictionary(Of Integer, String)
End Class
Name(x) contains the state name in different languages. I get a collection of State from the method StateManager.GetAllStates() and I want to bind this collection to a DropDownList. The problem is that I can't find how to set the DataTextField property to let's say stateList.Name(1) which is the english name of my state.
Dim stateList As StateCollection = StateManager.GetAllStates()
Me.DataSource = stateList
Me.DataValueField = "StateId"
Me.DataTextField = "Name(1).Value" <-- Problem here
Me.DataBind()
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Aug 20, 2010
in dropdownlist show the all PatientName and save the PatientID . how to show the PatientName in DataGrid.
PatientID, PatientName are Foreign Keys. In DataBase on Save the the PatientID my requiredment is PatientName show in DataGrid based on PatientID.
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Aug 13, 2010
I would rather not magic string my DataTextField/Values on the dropdownlist after setting up the source as a List collection of objects.
I was thinking I could use the DataSource properties but it doesn't seem to like the couple of ways I tried.
WORKS BUT NOT IDEAL
//set the datasource to the returned List<Cart>
this.cartDdl.DataSource = CartManager.Load(WebProfile.Current.UserName);
//set the DataValueField to the Cart.ID property
this.cartDdl.DataValueField = "ID";//would rather use the obj property Cart.ID
//set the DataTextField to the Cart.Description property
this.cartDdl.DataTextField = "Description";//would rather use the obj property Cart.Description
//Bind the ddl to the datasource
this.cartDdl.DataBind();
HOW I WOULD THINK IT COULD WORK this.cartDdl.DataValueField = ((Cart)this.cartDdl.DataSourceObject).ID; this.cartDdl.DataTextField = ((Cart)this.cartDdl.DataSourceObject).Description;
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Feb 24, 2011
I have a Listbox
dimension.DataSource = provider.DimensionList;
dimension.DataBind();
I want the value to be the ID of these elements
dimension.DataSource = provider.DimensionList;
dimension.DataValueField = "ID";
dimension.DataBind();
But I don't want the text to change to the ID, I want that the dimension.DataTextField gets the object.ToString().
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Mar 17, 2010
I'm using radcombobox and radgrid.Here i want to display ward_no but store ward_id in database.But in my code ward_id field not store, ward_no is store. What is the problem?
My code is......
<telerik:RadComboBox ID="ddWardNo" runat="server" DataSource='<%# ddWardBind() %>' DataTextField="ward_no" DataValueField="ward_id" Skin="Vista" Width="205px" >
</telerik:RadComboBox>
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Dec 24, 2010
I am using a combobox.
I'm retrieving the data from database to fill the combobox. The name of the combobox is kategorilist. I want to set a string value to datavaluefield of the combobox. Also I'm using datalist with paging in this page. Datalist is binding with the selected value of the combox everytime.
Like this;
li.Value = "urunlist.aspx?ktid=" + dr["KategoriID"] + "&Sinif=" + sinifsa.ToString();
But it doesn't work. It worked with html <select> tag but ajax combobox doesn't accept this value.
Here is my code:
private void KategoriAdlariniGetir(int sinifsa)
{
DataSet ds = new DataSet();
SqlConnection con = new SqlConnection(cnnstr);
[Code]....
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Jan 14, 2010
What do I use to set the dataValueField of the Select List when I'm using a list of strings. I want to be able to set the value of the option in the select. If i have:
List<string> list = new List<string>();
list.Add("apple");
list.Add("orange");
and I want my html to be:
<select>
<option value="apple">apple</option>
<option value="orange">orange</option>
</select>
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Nov 18, 2010
I have a dataset which I am binding to a listbox. However, I want to combine two of the fields to make up the DataTextField. Is this possible, or am I going to have to loop through the Data Rows?
lstAddressDropdown.DataSource = dsAddress;
lstAddressDropdown.DataTextField = "StreetAddress" + "Place";
lstAddressDropdown.DataBind();
lstAddressDropdown.Items.Insert(0, new ListItem("Please select"));
It's worth noting that the dataset comes back from a web service so I can't change any stored procedure to combine the columns there.
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Feb 18, 2011
How do I have a label display a DDL's datatextfield?
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Aug 5, 2010
<asp:SqlDataSource ID="sql_Region" runat="server" ConnectionString="<%$ ConnectionStrings:Test %>" SelectCommand="SELECT Number, Name FROM table_Region WHERE Number = @Number" SelectCommandType="Text">
<asp:DropDownList ID="dd_Region" runat="server" DataSourceID="sql_Region" DataTextField="Name" DataValueField="Number" /> Ok, I have this dropdownlist and I want to use the DataTextField for a label control.
Something like this. I want to show the region as a label but I only could get the DataValueField value not DataTextField value. Does anybody knows? <asp:Label ID="label_Region" runat="server" /> <C#>
label_Region.Text = dd_Region.SelectedValue.ToString(); <--I know by doing this, I can get the DataValueField but. label_Region.Text = (DataTextField) <<--How do I get this value? I want to show the region name not the region number
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Feb 17, 2011
I have a tree view control.The text of the tree view childs is very big ,i need to wrap the text of the tree view control.How to do that.
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Aug 31, 2010
I have 2 dropdownlist - State and City. I want to fill city drop down list on selectedIndexChanged event of state drop down list. I fill the State ddl ( DataTextField = "Locationname" & DataValueField = "Locationid" ) using linq and when i changed state I didn't get "Locationid" and I got error - " conversion from string "Locationid" to type "Double" is not valid" .
following are the code
[Code]....
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Apr 7, 2010
I am not sure if my subject is phrased properly but here is what I am getting problems with.I have a detailsview which had about 3 dropdownlist (ddl) on it. The DDL's works fine when I insert a new record or I try to edit an existing record.But when I just want to view the data in the detailsview it displays the primary keys (DataValueFields) instead of the associated DataTextField Value.
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Aug 19, 2010
how to show the dropdownlist datatextfield selected text in the DataGrid
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