We Keep Coding

Enum - combobox binding with one item as exception

I have a Enum which I am binding to ComboBox.
But i dont want to show one enum value in combobox items.
If I try to remove after binding it is throwing error.
cmbDisplayUnit.Items.Remove(item);
Is it possible to binding to enum and still removing or atleast hiding one of the values of Enum?

If you look at this MSDN Forum article it gives an example on how to do what you are wanting. See Sorrocco's answer.
Modified from above link:
string[] TestNames = Enum.GetNames(typeof(SampleEnumUnits));
var list = from test in TestNames where test != "Enum you wish to remove" select Enum.Parse(typeof(SampleEnumUnits), test);
cmbDisplayUnit.ItemsSource = list;

I think you need this:
cmbDisplayUnit.Items.Remove((int)item); // I assume item is enum variable

var items = Enum.GetValues(typeof(datMHD.Enums.EquipmentEnums.Request_ItemType));
var List = items.OfType<datMHD.Enums.EquipmentEnums.Request_ItemType>().ToList();
List.RemoveAll(e => e.Equals(datMHD.Enums.EquipmentEnums.Request_ItemType.Spare_Parts));
You convert the Array values to List then use RemoveAll then Assign the Item to a combo box

How can I hide an option in my drop down without changing the query

I have a drop down in aspx that is binded using a class that has a function that retrieves a list of departments. There is a department Name "Audits and Verifying". I do not want to modify the query to do a select Name, DepatmentValueName from departments where DepartmentValueName <> 'AuditsVerifying' . Instead I want to hide it some how in the code in C# is this possible?
DepartmentsAdmin DepartmentName = new DepartmentsAdmin();
DepartmentType.DataSource = DepartmentName.GetAllDepartments();
DepartmentType.DataTextField = "Name";
DepartmentType.DataValueField = "DepartmentValueName";
DepartmentType.DataBind();
Thank you in advance

Try this-
ListItem removeListItem = DepartmentType.Items.FindByText("Audits and Verifying");
DepartmentType.Items.Remove(removeListItem);

You can remove an item from your dropdownlist control after you bind to it.
DepartmentType.Items.Remove(DepartmentType.Items.FindByText("AuditsVerifying"));

The dropdown.Items is an instance of a ListItemCollection. Below is an example of how to remove a ListItem from a ListItemCollection
ListItem myListItem = new ListItem(Delete.Text.ToLower(),Delete.Text.ToLower());
// Check whether the 'ListItem' is present in the 'ListBox' or not.
if(ItemCollection.Contains(myListItem))
{
String deleteString=Delete.Text;
// Delete the listitem entered by the user in textfield.
ItemCollection.Remove(deleteString.ToLower());
Message.Text="<font color='green'><b>Deleted Successfully</b></font>";
}
else
{
Message.Text="<font color='red'><b>No ListItem with the given name is present in the ListBox for deletion.</b></font>";
}
Or you may remove an item based on the Text it displays by using:
DropDownList.Items.Remove("<your string that you want to remove>");
ListItemCollection.Remove() Method

ListItem's value gets replaced by the text on DataBind

I'm at a bit of a loss on this one and haven't been able to find anything helpful in my searches so I'm hopeful someone can help me out here.
I've got a RadioButtonList that I'm adding a List of dynamically created ListItems, where I set both the text and the value for each item. On DataBind for the RadioButtonList the Value for the ListItem gets replaced by the Text, which just doesn't seem to make sense to me.
I can see on the client side when I look in Firebug that the label and the value on the input are the same, and the value is nowhere to be seen.
Has anyone else had any experiences like this, or does anyone know where I might be going wrong?
var rbList = new List<ListItem>();
var radioButtonList = new RadioButtonList();
foreach(var object in objects) {
var li = new ListItem {Text = object.Name, Value = object.Guid};
rbList.Add(li);
}
radioButtonList.DataSource = rbList;
radioButtonList.DataBind();

Should you be using Databinding here? Can you not just add your ListItems to the radio button list directly?
I would imagine that the Databinding is getting confused about how to bind your list so is just using ToString on each of your elements which seems to just return the Text Property. This is then being used as both the Text and the Value.
You probably just want to create your items and add them straight to your Radio button control as follows:
var radioButtonList = new RadioButtonList();
foreach(var object in objects) {
var li = new ListItem {Text = object.Name, Value = object.Guid};
radioButtonList.Items.Add(li);
}

For those, whose are still struggling - do not forget to fill DataValueField, if control has it. Simply provide string name of your value property and you will be fine.
As Chris mentioned - Databinding was in fact confused and therefore DataValueField exists. My problem was with basic asp:DropDownList.

How to set selected value from Combobox?

I use combobox in c# windows form. I bound the item list as below:
var employmentStatus = new BindingList<KeyValuePair<string, string>>();
employmentStatus.Add(new KeyValuePair<string, string>("0", "[Select Status]"));
employmentStatus.Add(new KeyValuePair<string, string>("1", "Contract"));
employmentStatus.Add(new KeyValuePair<string, string>("2", "Part Time"));
employmentStatus.Add(new KeyValuePair<string, string>("3", "Permanent"));
employmentStatus.Add(new KeyValuePair<string, string>("4", "Probation"));
employmentStatus.Add(new KeyValuePair<string, string>("5", "Other"));
cmbEmployeeStatus.DataSource = employmentStatus;
cmbEmployeeStatus.ValueMember = "Key";
cmbEmployeeStatus.DisplayMember = "Value";
cmbEmployeeStatus.SelectedIndex = 0;
I save the selected value in database eg.1 or 2. Now I want to set selected value from database item like:
cmbEmployeeStatus.SelectedValue =employee.employmentstatus;
But combobox not selected with value. How can I do that?

Try this one.
cmbEmployeeStatus.SelectedIndex = cmbEmployeeStatus.FindString(employee.employmentstatus);

In order to do the database style ComboBoxes manually trying to setup a relationship between a number (internal) and some text (visible), I've found you have to:
Store you items in a list (You are close - except the string,string - need int,string)
DataSource property to the list (You are good)
DataMember,DataValue (You are good)
Load default value (You are good)
Put in value from database (Your question)
Get value to put back in database (Your next question)
First things first. Change your KeyValuePair to so it looks like:
(0,"Select")
(1,"Option 1")
Now, when you run your sql "Select empstatus from employees where blah" and get back an integer, you need to set the combobox without wasting a bunch of time.
Simply: *** SelectedVALUE - not Item ****
cmbEmployeeStatus.SelectedValue = 3; //or
cmbEmployeeStatus.SelectedValue = intResultFromQuery;
This will work whether you have manually loaded the combobox with code values, as you did, or if you load the comboBox from a query.
If your foreign keys are integers, (which for what I do, they all are), life is easy. After the user makes the change to the comboBox, the value you will store in the database is SelectedValue. (Cast to int as needed.)
Here is my code to set the ComboBox to the value from the database:
if (t is DBInt) //Typical for ComboBox stuff
{
cb.SelectedValue = ((DBInt)t).value;
}
And to retrieve:
((DBInt)t).value = (int) cb.SelectedValue;
DBInt is a wrapper for an Integer, but this is part of my ORM that gives me manual control over databinding, and reduces code errors.
Why did I answer this so late? I was struggling with this also, as there seems to be no good info on the web about how to do this. I figured it out, and thought I'd be nice and post it for someone else to see.

In windows Appliation
we use like this
DDLChangeImpact.SelectedIndex = DDLChangeImpact.FindStringExact(ds.Tables[0].Rows[0]["tmchgimp"].ToString());
DDLRequestType.SelectedIndex = DDLRequestType.FindStringExact(ds.Tables[0].Rows[0]["rmtype"].ToString());

Use the SelectedIndex property for the respective employee status in the combo box.

Below will work in your case.
cmbEmployeeStatus.SelectedItem =employee.employmentstatus;
When you set the SelectedItem property to an object, the ComboBox attempts to make that object the currently selected one in the list. If the object is found in the list, it is displayed in the edit portion of the ComboBox and the SelectedIndex property is set to the corresponding index. If the object does not exist in the list, the SelectedIndex property is left at its current value.
EDIT
I think setting the Selected Item as below is incorrect in your case.
cmbEmployeeStatus.SelectedItem =**employee.employmentstatus**;
Like below
var toBeSet = new KeyValuePair<string, string>("1", "Contract");
cmbEmployeeStatus.SelectedItem = toBeSet;
You should assign the correct name value pair.

cmbEmployeeStatus.Text = "text"

I suspect something is not right when you are saving to the db. Do i understand your steps as:
populate and bind
user selects and item, hit and save.. then you save in the db
now if you select another item it won't select?
got more code, especially when saving? where in your code are initializing and populating the bindinglist

A possible solution:
cmbEmployeeStatus.SelectedValue = cmbEmployeeStatus.Items.FindByText("text").Value;

try this
combobox.SelectedIndex = BindingSource.Item(9) where "9 = colum name 9 from table"

To set value in the ComboBox
cmbEmployeeStatus.Text="Something";

Try this:
KeyValuePair<string, string> pair = (KeyValuePair<string,string>)this.ComboBox.SelectedItem;

display the selected dropdown

I am retrieving the credit card type from Database and have to show what credit card type the merchant have used, in the dropdowm. The dropdown has 4 types like Master, Visa, American Express and Discover along with select.
I retrieve it well, but I am not sure how to bind it such that it has all the 4 types along with select but should show the creditcard that has been used.
if (cardtype == 1)
{
ddCreditCardType.SelectedValue = ((int)CommonHelper.CCType.Master).ToString();
}
((int)CommonHelper.CCType.Master).ToString();
//This part gets the type of card used but does not put in the ddCreditCardType.
Please help me out! Thank you!

it looks like your CCType is an enum.
here's what you want to do:
ddCreditCardType.SelectedValue = ((CommonHelper.CCType) cardtype ).ToString();
cardtype is an int, you cast it to your enum type CCType. then convert it to string which returns "Mastercard" or whatever instead of "1" as before. your dropdown probably had the name as its datatext and datavalue bc it didnt have it defined. you would want to set selected value to "1" if your dropdown.DataText = "CardTypeID" or something like that.

The ddCreditCardType.SelectedIndex allows you to set the index.
string TypeOfCard = "Mastercard"; // Replace with your retrieval code
ddCreditCardType.SelectedIndex = ddCreditCardType.Items.IndexOf("Mastercard");
Note that you really must provide error checking because you could get nulls...

Assuming you've just got constants for all the CC types, I'd probably just do something like:
var selectedCardId = ??;
//Make an array of all the card types (this can be a constant)
var cardTypes = new CommonHelper.CCType[]{CommonHelper.CCType.Master, CommonHelper.CCType.Visa, CommonHelper.CCType.Express, CommonHelper.CCType.Whatever};
//Loop through, and build the drop-down
foreach(var card in cardTypes)
{
ddCreditCardType.Items.Add(new ListItem
{
Value = ((int)card).ToString(),
Text = card.ToString(),
IsSelected = (selectedCardId == (int)card)
});
}
I'm sorry, it's been a while since I've done webforms (Or Winforms?)
You'll have to double-check the properties of the list-item thing's.
Good Luck,
Dave

When you build the dropdown, what is the Value in the dropdown. You can choose a text to display and the value behind each item. If your value is CommonHelper.CCType.Master), it should work.