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VB.NET读取文件中的数字并相加或者排序，如何操作，用到哪些类?如,（Button1）随机生成10个数的文件\Exam.txt,然后（Button2）将10个数读出相加，（Button3）将结果追加至文件，怎么做？
下面的程序对否？
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim myfile As New FileStream("\Exam.txt", FileMode.OpenOrCreate, FileAccess.Write)
        Dim mybwriter As New BinaryWriter(myfile, System.Text.Encoding.Unicode)
        Dim i, number As Integer
        For i = 0 To 9
            number = 10 + Int(90 * Rnd())
            mybwriter.Write(number)
        Next i
        mybwriter.Close()
    End Sub
    Public Shared sum As Integer
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim myfile As New FileStream("Exam.txt", FileMode.Open, FileAccess.Read)
        Dim mybreader As New BinaryReader(myfile,system.Text.Encoding.Unicode)
        Dim i, number() As Integer
        For i = 0 To 9
            number(i) = mybreader.ReadInt32()
            sum = sum + number(i)
        Next i
        mybreader.Close()
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim myfile As New FileStream("\Exam.txt", FileMode.OpenOrCreate, FileAccess.Write)
        Dim mybwriter As New BinaryWriter(myfile, System.Text.Encoding.Unicode)
        mybwriter.Write(sum)
        mybwriter.Close()
    End Sub
        mybwriter.Close()
    End Sub --------------------编程问答-------------------- 随机数就random
一般的文件操作用写用:System.IO.StreamWriter
读用:System.IO.StreamReader 这两个比较简单.
dim b as new random
dim i as int32
i=b.Next (10000,99999)
b.next取得两个数中间的随机数.(随机数在MIN和MAX范围之内)

补充：.NET技术 ,  VB.NET