[.NET] 請問如何將變數內容寫到.txt檔

[a70103 (好想回台中....)]

小弟我在寫一個自動餵資料的程式
目前卡在不知道要如何將產生出來的值
寫到txt檔
例如我將檔案放置在C:\data.txt
請問要如何寫呢?
以下是我的程式碼

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)

        Dim Num() As String = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

        Dim i As Integer
        Dim a As String
        Dim data As FileAttribute

        data = FileAttribute.System
        Dim b As String
        Dim s As String
        Dim last As Integer
        b = "00000"
        For i = 0 To 100

            FileOpen(1, "c:\data.txt", OpenMode.Input)
            Randomize()
            s = (Int(5) * Rnd() + 1)

            a = b & Num(s)


            FileClose(1)
        Next



        MsgBox("產生完畢")


    End Sub


End Class

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