你实例化一个文件对象，就可以获取这个文件的相关属性了，VB.NET实例，以你的文件为例：
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Dim sourcefileinfo As New FileInfo(“ c:\1.txt”) '定义并实例化FileInfo对象。length就是它的大小！
label1.Text = "文件大小为: " sourcefileinfo.Length "字节"
CSV文件特征是每行一条记录，字段用逗号分开。你只需要逐行处理，将每行文本用逗号切分得到数组array，然后判断array[0]是否等于"bbb"，如果相等则array[1]就是”4561234567890“；如果不等则继续处理下一行。
窗体上添加一个按钮，代码如下：
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Button1.Text = "稍等！"
Button1.Enabled = False
Dim MyFolder As String = "C:\Windows"
Dim MyDir As New System.IO.DirectoryInfo(MyFolder)
Dim MyInfo As String = MyFolder + "文件夹的大小是：" + CalculateDirectorySize(MyDir, True).ToString() + "字节。"
MessageBox.Show(MyInfo, "信息提示", _
MessageBoxButtons.OK, MessageBoxIcon.Information)
Button1.Text = "开始"
Button1.Enabled = True
End Sub
Public Shared Function CalculateDirectorySize(ByVal MyDirectory As System.IO.DirectoryInfo, ByVal IsSubDirectories As Boolean) As Long
Dim MySize As Long = 0
'检查包含的所有文件
Dim MyFiles() As System.IO.FileInfo = MyDirectory.GetFiles()
For Each MyFile As System.IO.FileInfo In MyFiles
MySize += MyFile.Length
Next
'检查包含的所有子文件夹
If (IsSubDirectories) Then
Dim MyDirs() As System.IO.DirectoryInfo = MyDirectory.GetDirectories()
For Each MyDir As System.IO.DirectoryInfo In MyDirs
MySize += CalculateDirectorySize(MyDir, True)
Next
End If
Return MySize
End Function
End Class
