Binding multiple Dropdowns and textfields - asp.net

Question

In my project I have 2 dropdowns 1 listbox and 1 textbox. I Have already bound the 2 dropdowns together "PostalDropDown" and "CityDropDown" from the database and it works fine, Then i bind the listbox also to the previous dropdowns and it works fine also!
My question here i still have the last Textbox which i want it to display the name which is also bound to the results of dropdowns.
I cannot figur it out because the textbox does not have the SelectValue property, so I cannot assign it like i did with my dropdowns or listbox like i did:
if (!IsPostBack)
{
IEnumerable<Tuple<string, string, string, string>> data = GetData();
DropDownListPostal.DataSource = data.Select(tuple => tuple.Item1).Distinct().ToList();
DropDownListPostal.DataBind();
DropDownListCity.DataValueField = "Item1";
DropDownListCity.DataTextField = "Item2";
DropDownListCity.DataSource = data;
DropDownListCity.DataBind();
ListBox1.DataValueField = "item1";
ListBox1.DataTextField = "Item4";
ListBox1.DataSource = data;
ListBox1.DataBind();
}
}
and then i view the result on this on the selectedindexchanged on first dropdown:
protected void DropDownListPostal_SelectedIndexChanged1(object sender, EventArgs e)
{
//DropDownListPostal.ClearSelection();
ListBox1.ClearSelection();
DropDownListCity.ClearSelection();
var postal = DropDownListPostal.SelectedValue;
var listItem = DropDownListCity.Items.FindByValue(postal);
var street = ListBox1.Items.FindByValue(postal);
listItem.Selected = true;
street.Selected = true;
Can anyone show me how to add the rest of the database results on a textbox?
I can put the whole code for the page if you all want.
Cheers

Answer 1

If you really want to show all of the items in a Textbox which is quite strange you can display them comma seperated like this
TextBoxId.Text = String.Join(",", data.Select(op => op.Name));
Where Name is the property that contains the property you want to display in textbox
Edit
If you want to display the selected items of Listbox then loop on its item and check if the item is selected then display it in your textbox.
foreach (ListItem item in ListBox1.Items)
{
if (item.Selected)
{
txtval.Text += " " + item.Text +"/"+ dropdowncity.SelectedItem.Text +"/"+ dropdownpostal.SelectedItem.Text;
}
}