Listbox selected items

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Hi,

am developing winforms application,

listbox is multiselection listbox.

am filling listbox with datasource, depending on selected values from listbox,
i need to get data from database,

how to solve it.

C#

<pre lang="c#"> using (MySqlConnection con = new MySqlConnection(ConnectionString))
            {
                string query = "select distinct area_code from customer";
                con.Open();
                MySqlDataAdapter da = new MySqlDataAdapter(query,con);
                DataTable dt = new DataTable();
                da.Fill(dt);
                listBox1.DataSource = dt;
                listBox1.DisplayMember = "area_code";
            
            }

listbox is displaying fine as ex:11
33
44

when i select 11, 33

i need a query to select data from database.

am using:

C#

<pre lang="c#"> foreach (Object item in listBox1.Items)
            {
                text += item.ToString() + " ";
            }

            area = text;

and query is:
query1 = "select customer_id,name,area,mobile_number,package_name,package_type,activation_date,status,monthly_amount,lastpaid_date,lastpaid_amount,nextpay_date,totalamount_paid,totaldue_amount,total_charges from customer where area_code="+area+" ";

Posted 23-Mar-14 20:34pm

Member 10263519

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Raul Iloc · Answer 1 · 2014-03-23T22:48:00

Solution 1

First you should build your area temp string like this:

C#

string area = string.Empty;
foreach (Object item in listBox1.Items)
{
 if(area.Length > 0) area += ", ";
 area += item.ToString();
}

Then to use the area string to build your query:

C#

query1 = "select customer_id,name,area,mobile_number,package_name,package_type,activation_date,status,monthly_amount,lastpaid_date,lastpaid_amount,nextpay_date,totalamount_paid,totaldue_amount,total_charges from customer where area_code in ("+area+")";

Posted 23-Mar-14 22:48pm

Raul Iloc

Updated 23-Mar-14 22:50pm

v3

Comments

Member 10263519 24-Mar-14 5:06am

when i observe by keeping breakpoint at area in above code.
am getting area value "System.Data.DataRowView"

am not getting what's the problem.

Raul Iloc 24-Mar-14 5:34am

In my solution "area" is just a name for a temp string variable, so you have to use other name for it if this name is already used for other object in your code!

Member 10263519 24-Mar-14 6:16am

i solved

Raul Iloc 24-Mar-14 7:38am

OK, I hope that my solution helped you!