multiple selection listbox problem urgent help req

Try tis:
1. Suppose u have a LISTBOX with Name "LstTable" wit Property SelectionMode="MultiExtended".

2. Take Button wit Name BtnCombine
 
3. Below ListBox take 1 textbox to get value frm listbox after multiple selection

4. Select multiple items from listbox and thn press "BtnCombine" button.

5. Now,attaching code

private void BtnCombine_Click(object sender, EventArgs e)
        {
            textBox1.Text = null;
            for (i = 0; i < (LstTable.Items.Count);i++ )
            {               
                if(i!=0)
                textBox1.Text += "-";
             
               textBox1.Text += LstTable.SelectedItems[i].ToString();
            
            }

            string str = textBox1.Text;
            string[] SelectedItem = str.Split('-');
            for (int i = 0; i < SelectedItem.Length; i++)
            {
                textBox1.Text = SelectedItem[i];
            }
        }

i think tis can help u to pass query as array is used...
Reply if there is error or not getng...!