Saving a list of items to a database from a listbox

public string GetListItems()
{
    System.Collections.Generic.List<string> items = new System.Collections.Generic.List<string>();

    foreach (ListItem item in userList.Items)
    {
        if (item.Selected)
        {
            items.Add(item.Text);
        }
    }

    return String.Join(", ", items.ToArray());
}

for (int i = 0; i < ListBox1.Items.Count; i++)
{
ListItem item= new ListItem();
item.Text = ListBox1.Items[i].Text;
item.Value = ListBox1.Items[i].Value;
SqlCommand cmd=new SqlCommand("insert into tablename(listcolmText,listcolmValue) values('"+item.Text +"',"+ item.Value +")",conn);
cmd.ExecuteNonQuery();

}

protected void btnSave_Click(object sender, EventArgs e)
        {
            string value="";

            for (int i = 0; i < listbox1.Items.Count; i++)
            {               
                if(value != "")
                {
                  value += ",";
                }
                value += listbox1.Items[i].Text;
            }           
// Now you have all the values in comma (,) separated string.

          string[] arr = value.split(',');

         }