csharp skype send message in winform

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using SKYPE4COMLib;
using System.Collections;

namespace Skype
{
    /// <summary>
    /// 20120804 塗聚文
    /// 締友計算機信息技術有限公司
    /// Geovin Du geovindu@163.com
    /// </summary>
    public partial class Form1 : Form
    {
        string strskypeuser = string.Empty;
        string strskypeid = string.Empty;
        SKYPE4COMLib.Skype oSkype = new SKYPE4COMLib.Skype();
        /// <summary>
        ///
        /// </summary>
        public Form1()
        {
            InitializeComponent();
        }

        


        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            //不能發送文件在WEB上可以用
            //string file = @"E:\金蝶KIS系列产品简介.xls";
            //oSkype.Client.OpenFileTransferDialog(strskypeid, file);//打開發送文件
            oSkype.SendMessage(strskypeid, strskypeuser + ":" + textBox1.Text);


        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {


            if (oSkype.Client.IsRunning == false)//判断客户端是否运行
            {
                //是否能免費提供登錄調用的API？不管是DESKTOP或是WEB
                oSkype.Client.Start(true, true);//運行
                MessageBox.Show("請登錄SKPYE再重新操作", "請注意");
                return;

            }
            else
            {
                this.listBox1.DataSource = skyuselist();
                this.listBox1.DisplayMember = "userDisplayName";
                this.listBox1.ValueMember = "userLoginName";
            }
                ////初始化物件，預設會抓本機的Skype帳號資訊
                //SKYPE4COMLib.Skype oSkype = new SKYPE4COMLib.Skype();
                //UserCollection tFriends = oSkype.Friends;

                ////取出所有的朋友資訊
                //foreach (User tUser in oSkype.Friends)
                //{
                //    if (tUser.FullName.Trim() != "")
                //    {
                //        ListItem newItem = new ListItem(tUser.Handle, tUser.FullName);
                //        listBox1.Items.Add(newItem);
                //        this.listBox1.DisplayMember = "Name";
                //        this.listBox1.ValueMember = "ID";
                //        //listBox1.Items.Add(tUser.Handle);//賬號 //tUser.FullName //昵稱
                //        //listBox1.Items.AddRange(tUser.FullName);
                //    }
                        
                //}
        }

        /// <summary>
        ///
        /// </summary>
        /// <returns></returns>
        private DataTable skyuselist()
        {
            DataTable d = new DataTable();
            //初始化物件，預設會抓本機的Skype帳號資訊
            //SKYPE4COMLib.Skype oSkype = new SKYPE4COMLib.Skype();
            UserCollection tFriends = oSkype.Friends;
            d.Columns.Add("userLoginName", typeof(string));
            d.Columns.Add("userDisplayName", typeof(string));
            //取出所有的朋友資訊
            foreach (User tUser in oSkype.Friends)
            {
                if (tUser.FullName.Trim() != "")
                {
                    //ListItem newItem = new ListItem(tUser.Handle, tUser.FullName);
                    //listBox1.Items.Add(newItem);
                    //this.listBox1.DisplayMember = "Name";
                    //this.listBox1.ValueMember = "ID";
                    //listBox1.Items.Add(tUser.Handle);//賬號 //tUser.FullName //昵稱
                    //listBox1.Items.AddRange(tUser.FullName);
                    d.Rows.Add(tUser.Handle, tUser.FullName);
                }
                else
                {
                    d.Rows.Add(tUser.Handle, tUser.Handle);
                }
                
            }
            d.Rows.Add("geovindu", "geovindu");
            return d;
        }
        /// <summary>
        /// 選擇SKYPE用戶
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void listBox1_Click(object sender, EventArgs e)
        {
            strskypeuser= this.listBox1.Text;
            strskypeid = this.listBox1.SelectedValue.ToString();
            MessageBox.Show(strskypeuser+","+strskypeid);
        }