自己写的文件操作的function和Sub vb.net dll

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''原来用VB写的封装成dll供asp使用，后来升级到vb.net
''这个是我以前写的电影站影片处理的一部份，程序挺简单的，没怎么注释，大家对付看
''program by someeyes
''需要声明Imports System.IO命名空间

Public Function myFileExists(ByVal pathName As String) As String ''检查文件是否存在
If File.Exists(pathName) = False Then
myFileExists = "<font color=""Red"">文件丢失</font>"
Else
myFileExists = "<font color=""#0066ff"">文件存在</font>"
End If
End Function

Private sub myCreatDirectory(ByVal pathName As String) ''创建文件夹
Try
If Directory.Exists(pathName) = False Then
Directory.CreateDirectory(pathName)
End If
Catch e As Exception
myErrMsg = myErrMsg & "创建" & pathName & "文件夹的时候出现一个意外的错误."
myErrMsg = myErrMsg & e.ToString
HttpContext.Current.Response.Write("程序遇到一个意外的错误,详细情况请查看日志文件!<br>")
End Try

End Sub

Private Sub myDelDirectory(ByVal pathName As String) ''删除文件夹

Try
If Directory.Exists(pathName) = True Then
Directory.Delete(pathName)
End If
Catch e As Exception
myErrMsg = myErrMsg & "删除" & pathName & "文件夹的时候出现一个意外的错误."
myErrMsg = myErrMsg & e.ToString
HttpContext.Current.Response.Write("程序遇到一个意外的错误,详细情况请查看日志文件!<br>")
End Try

End Sub

Private Sub myMoveFile(ByVal pathName As String, ByVal target As String) ''移动文件夹
Try
File.Move(pathName, target)
Catch e As Exception
myErrMsg = myErrMsg & "从" & pathName & "移动文件到" & target & "的时候出现一个意外的错误."
myErrMsg = myErrMsg & e.ToString
HttpContext.Current.Response.Write("程序遇到一个意外的错误,详细情况请查看日志文件!<br>")
End Try
End Sub

Private Sub myCopyFile(ByVal fsource As String, ByVal fdestination As String)
Try
File.Copy(fsource, fdestination, False)
Catch e As Exception
myErrMsg = myErrMsg & "从" & fsource & "复制文件到" & fdestination & "的时候出现一个意外的错误."
myErrMsg = myErrMsg & e.ToString
HttpContext.Current.Response.Write("程序遇到一个意外的错误,详细情况请查看日志文件!<br>")
End Try
End Sub