Storing values in the DataValueField and DataTextField of a dropdownlist using a linq query
- by user1318369
I have a website for dance academy where Users can register and add/drop dance classes.
In the web page to drop a particular dance, for a particular user, the dropdown displays her registered dances.
Now I want to delete one of the dances from the list. So I'll remove the row from the table and also from the dropdownlist. The problem is that everytime the item with the lowest ID (index) is getting deleted, no matter which one the user selects. I think I am storing the DataTextField and DataValueField for the dropdown incorrectly. The code is:
private void PopulateDanceDropDown()
{
// Retrieve the username
MembershipUser currentUser = Membership.GetUser();
var username = currentUser.UserName;
// Retrive the userid of the curren user
var dancerIdFromDB = from d in context.DANCER
where d.UserName == username
select d.UserId;
Guid dancerId = new Guid();
var first = dancerIdFromDB.FirstOrDefault();
if (first != null)
{
dancerId = first;
}
dances.DataSource = (from dd in context.DANCER_AND_DANCE
where dd.UserId == dancerId
select new
{
Text = dd.DanceName,
Value = dd.DanceId
}).ToList();
dances.DataTextField = "Text";
dances.DataValueField = "Value";
dances.DataBind();
}
protected void dropthedance(object o, EventArgs e)
{
String strDataValueField = dances.SelectedItem.Value;
int danceIDFromDropDown = Convert.ToInt32(strDataValueField);
var dancer_dance = from dd in context.DANCER_AND_DANCE
where dd.DanceId == danceIDFromDropDown
select dd;
foreach (var dndd in dancer_dance)
{
context.DANCER_AND_DANCE.DeleteOnSubmit(dndd);
}
try
{
context.SubmitChanges();
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
The problem is in the line:
String strDataValueField = dances.SelectedItem.Value;
The strDataValueField is always getting the minimum id from the list of dance item ids in the dropdown (which happens by default). I want this to hold the id of the dance selected by the user.
