/// <summary>
    /// 连接Excel  读取Excel数据   并返回DataSet数据集合
    /// </summary>
    /// <param name="filepath">Excel服务器路径</param>
    /// <returns></returns>
    public System.Data.DataSet ExcelSqlConnection(string filepath)
    {
        string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties='Excel 8.0;HDR=YES;IMEX=1'";
        OleDbConnection ExcelConn = new OleDbConnection(strCon);
        try
        {
            ExcelConn.Open();
            DataTable dt=ExcelConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });//获取工作表名称（excel里面的工作簿）
            string strCom = string.Format("select * from [{0}]", dt.Rows[0]["Table_Name"]);
            OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, ExcelConn);
            DataSet ds = new DataSet();
            myCommand.Fill(ds);
            ExcelConn.Close();
            return ds;
        }
        catch
        {
            ExcelConn.Close();
            return null;
        }
    }