how to use datasource in user controls.

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C#

hello freinds
i am writting a program include below forms.
every photo is for one of forms.
i am using 3 layer architecture on entity framework.it's photo is in below link:
http://www.8pic.ir/viewer.php?file=17540479024128000147.jpg[^]
i have a main form :
http://www.8pic.ir/viewer.php?file=74547582891822146724.jpg[^]
there is some button on top of that.i click add button.
next form appears on the screen.
http://www.8pic.ir/viewer.php?file=66707912746213610128.jpg[^]
there are textbox and combobox and a UserControl under the form in to a panel.
i select a item in the listbox.
a user control add to my panel.
//-----------------------------------------------------------------------------

i made my question shorter.i need a guidline.
<pre lang="sql">in my code i am using a string array to save contents of listbox.i want to modify it to save contents of listbox in a datasource that it&#39;s contents be from type of a
entity.
i need to know that how i use a datasource to save temporarily a list of data in a user control which are not type of string. they should be type of a Entity.&lt;/pre&gt;</pre>
i need a thing like this picture.

<a href="http://www.8pic.ir/images/78697864078681572287.png">http://www.8pic.ir/images/78697864078681572287.png</a>[<a href="http://www.8pic.ir/images/78697864078681572287.png" target="_blank" title="New Window">^</a>]

next

<a href="http://www.8pic.ir/images/51362496456109944330.png">http://www.8pic.ir/images/51362496456109944330.png</a>[<a href="http://www.8pic.ir/images/51362496456109944330.png" target="_blank" title="New Window">^</a>]

next

<a href="http://www.8pic.ir/images/63598240075710477715.png">http://www.8pic.ir/images/63598240075710477715.png</a>[<a href="http://www.8pic.ir/images/63598240075710477715.png" target="_blank" title="New Window">^</a>]

thanks to help me.
//--------------------------------------------------------------------------------------
this was my wrong code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using InspectorSys.Model;
using InspectorSys.BLL;
//my class
namespace InspectorSys.UI
{
    public partial class UcMultiChoiceResponse : UserControl
    {
        int counter = -1;
        string[] array1 = new string[500];

multichoiceresponsetype>

        MultiChoiceResponseTypeBusiness biz = new MultiChoiceResponseTypeBusiness();
        List<responsechoice> ResponseChoice = new List<responsechoice>();
        List<multichoiceresponsetype>
        ResponseChoice selectedResponseChoice;
        List<responsechoice> responceChoiceList;
        ResponseChoiceBusiness responceChoiceBiz;
        AddEditState addEditState;

        public ResponseChoice SelectedResponseChoice
        {
            get { return selectedResponseChoice; }
        }

        public UcMultiChoiceResponse(ResponseChoiceBusiness responceChoiceBiz, List<responsechoice> responceChoiceList, ResponseChoice selectedResponseChoice = null)
        {
            InitializeComponent();
        }
//when i click add button.
        private void btnResponseChoice_Click(object sender, EventArgs e)
        {

            bdsResponseChoice.EndEdit();
            txtMultiChoice.Enabled = true;
            try
            {
                if (txtMultiChoice.Text != "")
                {
                    counter++;

                    lbUcMultiChoice.Items.Add(txtMultiChoice.Text);
           multiChoiceResponseType.AddRange((MultiChoiceResponseType)txtMultiChoice.Text.ToList());
                    lbUcMultiChoice.SelectedIndex = lbUcMultiChoice.Items.Count - 1;
                    //copy in array
                    array1[counter] = txtMultiChoice.Text;
                    txtMultiChoice.Text = null;
                    txtMultiChoice.Focus();

                    lbUcMultiChoice.ClearSelected();
                    this.lbUcMultiChoice.SelectedIndex = this.lbUcMultiChoice.Items.Count - 1;

                }

                if (counter &gt;= 0)
                {
                    delbtnMultiChoice.Enabled = true;
                }
            }
            catch { };
            lbUcMultiChoice.Focus();
        }

//I click delete button
        private void button2_Click(object sender, EventArgs e)
        {
            counter--;
            for (int i = 0; i &lt; lbUcMultiChoice.SelectedItems.Count; i++)
                lbUcMultiChoice.Items.Remove(lbUcMultiChoice.SelectedItems[i]);
            this.lbUcMultiChoice.SelectedIndex = this.lbUcMultiChoice.Items.Count - 1;
            delbtnMultiChoice.Enabled = true;
            if (counter &lt; 1)
            {
                delbtnMultiChoice.Enabled = false;
            }
        }

    }

}