int count = lbUserPrivilegeList.SelectedItems.Count;
                arrSelectedValue = new int[count];
                DataSet dsUserPrivilege = new DataSet();
                int index = 0;
                foreach (DataRowView datarow in lbUserPrivilegeList.SelectedItems)
                {
                    //UserRoleId = Convert.ToInt32(cmbUserRole.SelectedValue);
                    //arrSelectedValue[index] = Convert.ToInt32(datarow.Row.ItemArray[0]);
                    lbUserSelectedPrivilegeList.Items.Add(datarow.Row.ItemArray[1]);
                    
                    //index++;
                }
                for (int iRetValue = count - 1; iRetValue >= 0; iRetValue--)
                {
                    lbUserPrivilegeList.Items.Remove(lbUserPrivilegeList.SelectedItems[iRetValue]);
                }
                   //lbUserPrivilegeList.Items.Remove();
                   //dsUserPrivilege.Tables[0].Rows[0].Delete();
              
                     lbUserPrivilegeList.ClearSelected();

// If all you need to do is remove the item from the listbox this should work
foreach (int i in listBox1.SelectedIndices)
{
    object itemToRemove = listBox1.Items[i];
    listBox1.Items.Remove(itemToRemove);
}