從字符串到類型long的轉換在vb.net中無效錯誤

Question

限制對特定用戶的文件夾訪問。使用vb.net。在一個變量傳遞用戶名和密碼。但在這行我得到錯誤，如在above.the變量mailid提到和pwd包含類似XX一定的價值和YY

code 
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Dim FolderPath As String = "D:\ABC\2011\TAccount\HA\" 'Specify the folder here 
Dim UserAccount As String = mailid \ pwd 

Dim FolderInfo As IO.DirectoryInfo = New IO.DirectoryInfo(FolderPath) 
Dim FolderAcl As New DirectorySecurity 
FolderAcl.AddAccessRule(New FileSystemAccessRule(UserAccount, FileSystemRights.FullControl, InheritanceFlags.ContainerInherit Or InheritanceFlags.ObjectInherit, PropagationFlags.None, AccessControlType.Deny)) 

FolderInfo.SetAccessControl(FolderAcl) 

Answer 1

試着改變你的線以下........

Dim UserAccount As String = mailid & "\" & pwd 

基本上，我可以理解它是把你的字符串聲明作爲一個SUM，並試圖將DIVIDE mailid BY pwd所以因此它認爲它的字符串，並試圖將其轉換爲數字。