Multi Selection in ListBox and Adding One ListBox to another Listbox in Asp.net c#

  Aspx Page

   <asp:ListBox ID="listboxEducation" runat="server" SelectionMode="Multiple" Height="150">
    </asp:ListBox>
   <asp:ImageButton ID="imgAdd" ImageUrl="~/Hospital/icons/rightArrow.png" Height="25"
      Width="25" runat="server" OnClick="imgAdd_Click" />
       <asp:ImageButton ID="imgRemove" ImageUrl="~/Hospital/icons/leftArrow.png" Height="25"
             Width="25" runat="server" onclick="imgRemove_Click"/>
        <asp:ListBox ID="listboxEducationSelected" runat="server" SelectionMode="Multiple"
                Height="150"></asp:ListBox>

.cs page c#.

  protected void imgAdd_Click(object sender, ImageClickEventArgs e)
        {
                int _count = listboxEducation.Items.Count;
              if (_count != 0)
             {
                for (int i = 0; i < _count; i++)
                {
                    if (listboxEducation.Items[i].Selected)
                    {
                        ListItem item = new ListItem();
                        item.Text = listboxEducation.Items[i].Text;
                        item.Value = listboxEducation.Items[i].Value;
                        listboxEducationSelected.Items.Add(item);
                        listboxEducation.Items[i].Enabled = false;
                    }
                }
            }
         
        }

  protected void imgAddExpertise_Click(object sender, ImageClickEventArgs e)
        {
            int _count = ListBoxExpertise.Items.Count;
            if (_count != 0)
            {
                for (int i = 0; i < _count; i++)
                {
                    if (ListBoxExpertise.Items[i].Selected)
                    {
                        ListItem item = new ListItem();
                        item.Text = ListBoxExpertise.Items[i].Text;
                        item.Value = ListBoxExpertise.Items[i].Value;
                        ListBoxExpertiseSelected.Items.Add(item);
                        ListBoxExpertise.Items[i].Enabled = false;
                    }
                }
            }
        }

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