.NET的导入excel表格到数据库

怎么获得excel文件路径啊，不知道怎么写，大神给点提示啊，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，

Dim Pt As String = Path.GetExtension(FileNm)
    Dim FileStyle As String = Pt.ToLower
                   ExcelConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + FileNm + ";Extended Properties=Excel 8.0;"