CODEWITHSUNDEEP
c#asp.netwebforms
ca.adamgordon
ca.adamgordon

Reputation: 17

Dynamically populated DropDownList setting SelectedIndex changes both DropDownList

I'm trying to set the selected index or value of two DropDownList that are populated from an array.

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            ListItem[] jobs;
            List<ListItem> data = new List<ListItem> {
                new ListItem("Hello", "World"),
                new ListItem("new", "item"),
                new ListItem("next", "item2"),
                new ListItem("four", "four")
            };
            jobs = (from x in data
                    select new ListItem(x.Text, x.Value)).ToArray();
            // jobs is any array of list items where
            // text = value or text != value, but value is unique.
            DropDownList1.Items.AddRange(jobs);
            DropDownList2.Items.AddRange(jobs);
            DropDownList1.SelectedIndex = 1;
            DropDownList2.SelectedValue = jobs[3].Value;
        }
    }

On the actual page both DropDownList have "four" selected. How can I set different values?
Note: I know using linq is not needed here, but in the project code data is from a SQL DB.

Upvotes: 0

Views: 413

Answers (2)

i_shoot_photos
i_shoot_photos

Reputation: 176

Items.AddRange(array) preforms a shallow copy of array.

to preform a deep copy change 

DropDownList1.Items.AddRange(jobs);

to 

DropDownList1.DataSource = jobs;     

DropdownList1.DataBind();

repeat for the other list.

Upvotes: 0

Mehdi Souregi
Mehdi Souregi

Reputation: 3265

Create another ListItem jobsClone 

ListItem[] jobsClone = new ListItem[jobs.Length];
for (int i = 0; i < jobs.Length; i++)
{
    jobsClone[i] = new ListItem(jobs[i].Value);
}

then You can set your SelectedIndex 

DropDownList1.Items.AddRange(jobs);
DropDownList2.Items.AddRange(jobsClone);
DropDownList1.SelectedIndex = 1;
DropDownList2.SelectedIndex = 3;

Upvotes: 1

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