We Keep Coding

Winform Combobox with DataSource as List<int>

This may be a very simple question but I realized I could not get it work.
I have a Winform combo box with datasource as a List<int>
combo.DataSource = intList;
What do I put for .DisplayMember and .ValueMember in order to simply have a list of integer values? Not setting them will display nothing.
I have worked with other List<myObj> in which DisplayMember and ValueMember are myObj's properties. How about simple data type like int, string?
When retrieving the selected item, one could simply cast (int)(combo.SelectedItem) or have to go through the property corresponding to ValueMember?

The problem does not occur because you have a list of integers, it probably occurs because you add items to the list after assigning it to the .DataSource property. List does not have a mechanism to notify its container when items are added to or removed from it.
Either add items to the list before assigning it to the .DataSource property, or use a wrapper like BindingSource as Krishnraj Rana suggested.

Here BindingSource comes into picture. You can use it like this.
BindingSource bSource = new BindingSource();
bSource.DataSource = new List<int> { 1, 2, 3 };
combo.DataSource = bSource;
Though you can set datasource of combobox directly with list. like this -
combo.DataSource = intList;
This also works perfectly fine.

You can add items from list using foreach like this.
foreach (var v in intList)
{
comboBox1.Items.Add(v.ToString());
}

Listbox Selected Item to array

I have a DataTable with 2 columns called "ID" and "Software" that I have used as a DataSource for a lst_Software multiselect listbox.
I'm trying to gather the ID for all the selected items in that have been selected and place that in an int[] array.
Listbox setup:
lst_Software.DataSource = software; //software is a DataTable
lst_Software.DisplayMember = "Software";
lst_Software.ValueMember = "ID";
I've tried below
List<int> list = new List<int>();
for (int i = 0; i < lst_Software.SelectedItems.Count; i++)
{
list.Add(Convert.ToInt32(lst_Software.SelectedValue.ToString()));
}
int[] software = list.ToArray();
I'm finding that I'm only getting the first selected value except it will not iterate through all... I know why though. I'm not using i to get passed through inside the for loop. I'm hoping someone can give me a direction to go to iterate through all the selected values.
Thank you

You're using lst_Software.SelectedValue.ToString() here in the loop so it only returns the one item. You have a for loop but you're not using the index variable. However, all of this is unnecessary really all you need is;
var items = lst_Software.SelectItems;
As that property is already the list of selected items. From there you can cast/convert them as you please.

SelectedValue is just the first selected value. You need to use SelectedItems.

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 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;

Unable to select multiple items from a listbox in a Windows Phone 7 application

How can I select multiple items from the listbox in a Windows Phone 7 application?
e.g
listboxName.SelectedIndex = 0;
listboxName.SelectedIndex = 1;
listboxName.SelectedIndex = 2;
The above code selects 2 while I need to select all three of those.
The values I need to preselect are given to me in a array like
{true,true,true,false,false}
So I tried the using IsSelected like shown below... doesn't work.
int i = 0;
foreach (ListBoxItem currentItem in listboxName.SelectedItems)
{
if (tagindexeselected[i])
{
currentItem.IsSelected = true;
}
i++;
}
What would be the proper way to select multiple items in a listbox?

Hard to say there's a single, best way - it depends on how you're populating your list box, etc. First, be sure your list box's Selection Mode is set to Multiple or Extended.
One option is to use the ListBox's SelectedItems collection:
listBox1.SelectedItems.Add(listBox1.Items[0]);
listBox1.SelectedItems.Add(listBox1.Items[1]);
listBox1.SelectedItems.Add(listBox1.Items[2]);
Note also, in your example above, you're iterating over the SelectedItems collection - not the Items collection. If nothing is selected, that's an empty collection. Also, if your list box ItemsSource is not a series of ListBox Items (you can set your itemsSource to almost any enumeration), you will get an InvalidCastException when you go to run your foreach statement.

foreach (DataRowView item in lstServer.SelectedItems)
{
string WebServerIP = item[lstServer.DisplayMember].ToString();
string WebServerUrl = item[lstServer.ValueMember].ToString();
_WebObjIgent.Url = WebServerUrl;
}
Note : lstServer is Listbox of window application . By using Displaymember and valuemember proprty you can access value and text of listbox.