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RadComboBox databound not working fine for RadComboBox .selected value

<telerik:RadComboBox ID="ddlDepartment" runat="server" AutoPostBack="true"
EmptyMessage="Choose a Department"
onselectedindexchanged = "ddlDepartment_SelectedIndexChanged"
EnableLoadOnDemand="True" >
</telerik:RadComboBox>
corresponding C# databound code :
List<MdlPurchaseinvoice> objdpt = new List<MdlPurchaseinvoice>();
ddlDepartment.DataSource = SettingManager.GetDepartmentDetails();
ddlDepartment.DataTextField = "strDepartmentName";
ddlDepartment.DataValueField = "intDepartmentId";
ddlDepartment.DataBind();
now i need to programically select an item in the said combobox, for which i used
ddlDepartment.Selectedvalue = objpurchaseorder.intDepartmentId.ToString();
but unfortunately error is displayed near "Selectedvalue" as "it does not have any definition for selected value".
How can i solve this error ??

I have checked in Telerik site, SelectedValue Property Exist ,
I think you use the Wrong CASE , use SelectedValue instead of Selectedvalue
ddlDepartment.SelectedValue = objpurchaseorder.intDepartmentId.ToString();// New Code
ddlDepartment.Selectedvalue = objpurchaseorder.intDepartmentId.ToString();// OLd Code

How to list items with an empty for RadComboBox

I have one RadComboBox.
I fill it with a function which returns for example {Stack, Over, Flow, StackOverFlow}
When I click RadCombobox that items are listed.
And I want to give first place for empty element.
And I tried to do below:
var stack= GetItems(SiteId);
RadComboBox1.Items.Add(new RadComboBoxItem("", "0"));
RadComboBox1.DataSource = stack;
RadComboBox1.DataTextField = "Name";
RadComboBox1.DataValueField = "Id";
RadComboBox1.DataBind();
RadComboBox1.AllowCustomText = false;
There is no change. Only {Stack, Over, Flow, StackOverFlow} are listed.
When I write below code
var stack= GetItems(SiteId);
RadComboBox1.DataSource = stack;
RadComboBox1.DataTextField = "Name";
RadComboBox1.DataValueField = "Id";
RadComboBox1.DataBind();
RadComboBox1.Items.Add(new RadComboBoxItem("xyz", "0"));
RadComboBox1.AllowCustomText = false;
Only {Stack, Over, Flow, StackOverFlow, xyz} are listed.
But I dont get the result which I want.
And the design side is below.
<telerik:RadComboBox ID="RadComboBox1" runat="server" Width="120px" MarkFirstMatch="true" Filter="Contains"></telerik:RadComboBox>
How can I do?
I want to list { " " , "Stack", "Over", "Flow", "StackOverFlow"}

Using your first choice, add RadComboBox1.AppendDataBoundItems = true before you call DataBind(). This means it won't clear out the existing items before adding the items from the data bind. You will need to manually clear the items beforehand if necessary:
RadComboBox1.Items.Clear();
RadComboBox1.ClearSelection();

When you set RadComboBox DataSource property it will clear all the items in the RadComboBox.Items then iterates through the IEnumerable object which is set to it and add them to the items collection. In your case you can add all of your items manually using radComboBox.Items.Add().
var stack= GetItems(SiteId);
//Add your empty item.
RadComboBox1.Items.Add(new RadComboBoxItem("", "0"));
//Add all the other items
foreach(var item in stack)
{
RadComboBox1.Items.Add(new RadComboBoxItem(item.Name, item.Id))
}
RadComboBox1.DataTextField = "Name";
RadComboBox1.DataValueField = "Id";
Or you can add your empty item to the collection first and then bind it to the RadComboBox(I assume stack is a List of StackItem)
List<StackItem> stack = GetItems(SiteId);
//Add your empty item.
stack.Insert(0, new StackItem(){Name = "", Id = 0});
//Set the DataSource
RadComboBox1.DataSource = stack;
RadComboBox1.DataTextField = "Name";
RadComboBox1.DataValueField = "Id";
Although usually it's not a good idea to change your collection(latter example) for such cases.

populate CheckBoxList from query using FindByValue

I have an asp.net chckebox list:
<asp:EntityDataSource ID="GradeLevelEntityDataSource" runat="server"
ConnectionString="name=NewCourseRequestDataEntities"
DefaultContainerName="NewCourseRequestDataEntities" EnableFlattening="False"
EntitySetName="grade_levels" OrderBy="it.grade_level_index">
</asp:EntityDataSource>
<asp:CheckBoxList ID="GradeLevelCheckBoxList" runat="server" cssClass="horizontalcontrols"
DataSourceID="GradeLevelEntityDataSource"
DataTextField="grade_level_description" DataValueField="grade_level_id" AutoPostBack="True"
OnSelectedIndexChanged="CollegeInstitutionsListboxChange"
RepeatDirection="Horizontal" RepeatLayout="Flow">
</asp:CheckBoxList>
A user can return to the page, it gets the record ID, pulls the record data, and should check the appropriate checkboxes:
CheckBoxList grades = (CheckBoxList)FindControl("GradeLevelCheckBoxList");
foreach (request_grade_college r in CurrentRequest.request_grade_college)
{
ListItem grade = grades.Items.FindByValue(r.grade_level_id.ToString());
if (grade != null)
{
grade.Selected = true;
}
}
the portion of the code r.grade_level_id.ToString() does return the correct GUID, as type String. However, ListItem grade remain null, so none of the GradeLevelCheckboxList get checked.
What am I missing please?

I think that the data is not yet bound when you try to access it using Items.FindByValue(), try calling
grades.DataBind();
before the foreach loop.

Please make sure the listbox item's Value property has the correct value, if Item's Text and Value are different.
Also, Value Property and grade_level_id are exactly of same case and with trimmed spaces.

Dropdown default select value

This is a Dropdown control where I am binding the data, after bind I am putting the select statement. Even though the index is kept to 0 always select comes last like this:
Current output:
india
Auz
US
--select--
Required output:
--select--
india
AUZ
US
My Code
ddlcounty.DataSource = dtNew;
ddlcounty.DataTextField = "Weight";
ddlcounty.DataValueField = "Weight";
ddlcounty.DataBind();
ddlcounty.Items.Add("--Select--");
ddlcounty.SelectedValue = "0";
What is the change required here?
Thanks

You're doing your binding first.
When you get to the part where you are adding your default condition, you're actually adding to the end of the list.
Instead of :-
ddlcounty.Items.Add("--Select--");
Do :-
ddlcounty.Items.Insert(0, new ListItem("--Select--"));
This will insert your default option as the first element of Items.
Announced edit
You won't need :-
ddlcounty.SelectedValue = 0;
.. as if you don't explicitly specify, the first item in a drop down list is automatically selected.
If, however, you want to be explicit about it, you can do the following:-
ddlcounty.Items.Insert(0, new ListItem("--Select--","0"));
ddlcounty.SelectedValue = 0;

Would you please try below way:
Just set AppendDataBoundItems to true and Insert a ListItem as selected, and 'ClearSelection' before selecting item as below.
ddlcounty.AppendDataBoundItems = true;
ddlcounty.DataSource = dtNew;
ddlcounty.DataTextField = "Weight";
ddlcounty.DataValueField = "Weight";
ddlcounty.DataBind();
ddlcounty.ClearSelection();
ddlcounty.Items.Insert(0, new ListItem { Value = "0", Text = "--Select--", Selected = true });
ddlcounty.SelectedValue = "0";

You could also declare the "select one" ListItem declaratively in your aspx page like so
<asp:DropDownList ID="ddUIC" runat="server" AppendDataBoundItems="true" Width="200px" BackColor="White" Font-Size="10px" SelectedValue='<%# Bind("Weight") %>' DataTextField="Weight" DataValueField="Weight" >
<asp:ListItem Text="Select One" Value=""></asp:ListItem>
/asp:DropDownList>
But your AppendDataBoundItems would have to be set to true
And you could still perform your databinding on the backend.

ListView DropDownList Edit ListView

I have created a ListView that has editing enabled, the wizard generated the table with the use of textboxes but i require the use of dropdown lists for some options.
I have created the dropdown list
<asp:DropDownList ID="ActionStatusTextBox" runat="server">
<asp:ListItem Value="Ongoing">Ongoing</asp:ListItem>
<asp:ListItem Value="Open">Open</asp:ListItem>
<asp:ListItem Value="Closed">Closed</asp:ListItem>
</asp:DropDownList>
The drop down list generates successfully but doesn't submit and enter itself in the databse.
<%# Bind("ActionStatus") %>'
The above snippet needs to used somewhere in order to bind the data but which parameter does it need attaching to to pass the data?
I've tried everything and its giving me a right headache!
Thanks

Did you try:
<asp:DropDownList .. SelectedValue='<%# Bind("ActionStatus") %>' />
The SelectedValue property doesn't appear, but I believe you can set it this way.
HTH.

What are you attempting to insert into the database? You shouldn't need to bind anything if you add your listitems manually. You could just
string value = ActionStatusTextBox.SelectedValue;

I had the same issue. Check out this thread: Why is employee_id not being inserted into database
The key was in adding a function:
Protected Sub AbsentListView_ItemInserting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewInsertEventArgs) Handles AbsentListView.ItemInserting
e.Values("employee_id") = DirectCast(AbsentListView.InsertItem.FindControl("ExcusedAbsences_employee_idDropDownList2"), DropDownList).SelectedValue
End Sub
Which basically set the value of the dropdown when it needed it, and once i did this, the value was going into the database.

protected void ContactsListView_ItemDataBound(object sender, ListViewItemEventArgs e)
{
//Verify there is an item being edited.
if (ContactsListView.EditIndex >= 0)
{
//Get the item object.
ListViewDataItem dataItem = (ListViewDataItem)e.Item;
// Check for an item in edit mode.
if (dataItem.DisplayIndex == ContactsListView.EditIndex)
{
// Preselect the DropDownList control with the Title value
// for the current item.
// Retrieve the underlying data item. In this example
// the underlying data item is a DataRowView object.
DataRowView rowView = (DataRowView)dataItem.DataItem;
// Retrieve the Title value for the current item.
String title = rowView["Title"].ToString();
// Retrieve the DropDownList control from the current row.
DropDownList list = (DropDownList)dataItem.FindControl("TitlesList");
// Find the ListItem object in the DropDownList control with the
// title value and select the item.
ListItem item = list.Items.FindByText(title);
list.SelectedIndex = list.Items.IndexOf(item);
}
}
}