set multiple selected value on select2 multiple in asp.net dropdownlist from C#

Question

I need to add multiple author under a book. So i have used "Select2 Multiple" in asp dropdownlist. I was able to insert data but in edit mode i can't assign multiple selected value on dropdownlist.

My dropdownlist in aspx page is

    <asp:DropDownList ID="ddlAuthor" runat="server" multiple="multiple" data-placeholder="Select Author (s)" CssClass="form-control select2"></asp:DropDownList>

In C# i have tried as following but it add only one value. My c# code is

        foreach (DataRow row in dtAuthor.Rows)
        {
           ddlAuthor.Items.FindByValue(row["AUTHOR_ID"].ToString()).Selected = true;
        }

Any suggestion about how can i set multiple selected value in edit mode from c#?

My dropdown list will have thousand of data, so checkbox is a problem. Select2 suggestion is helpful in that sense. — Md Mahmudul Hasan
– Md Mahmudul Hasan, Commented Jun 28, 2016 at 7:09

Furtiro · Accepted Answer · 2016-06-28 07:37:49Z

2

You can't use a DropDownList to achieve this, use a listBox like this :

    <asp:ListBox ID="ddlAuthor" runat="server" SelectionMode="Multiple" data-placeholder="Select Author (s)" CssClass="form-control select2"></asp:ListBox>

And your code behind will work.

EDIT :

Here is a example of code behind for you :

        //I bind my ListBox with random data 
        List<string> data = new List<string>() { "Flo", "Auteur", "Patrick","Test" };
        //Databind
        ddlAuthor.DataSource = data;
        ddlAuthor.DataBind();

        //Here is my selected values, i wish that this values are selected
        List<string> selected = new List<string>() { "Flo", "Patrick" };

        //Foreach value in my selected list i select the proper value in my listbox
        foreach (string row in selected)
        {
            ddlAuthor.Items.FindByValue(row).Selected = true;
        }

edited Jun 28, 2016 at 7:37

answered Jun 28, 2016 at 7:03

Furtiro

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6 Comments

Md Mahmudul Hasan Over a year ago

How to set selected list in ListBox from c#?

Furtiro Over a year ago

As you did in your post, your code behind will work with a listBox

Md Mahmudul Hasan Over a year ago

Wow, Thanks a lot. As perfect as i wanted.

Furtiro Over a year ago

You cant hit the answer button on my answer to "close" this question :)

Furtiro Over a year ago

Even if your reputation is low you can always mark an answer as the answer in your own question , no ?

|

Qutaiba · Accepted Answer · 2016-06-28 07:00:49Z

0

you aren't using select2 in this case ! you need to use select2, and push all you multiple data into a variable and send it to js function or use ajax

$(".ddlAuthor").select2('data', youDataHere);

answered Jun 28, 2016 at 7:00

Qutaiba

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