Advanced Search

Querystring Validation

/ Published in: VB.NET
Save to your folder(s)

Expand | Embed | Plain Text

Copy this code and paste it in your HTML 
  1. Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
  2. 	' Validate Querystrings
  3. 	' Set raw querystring values to local variables, by definition,
  4. 	' these are strings.
  5. 	Dim RawSubjectID As String = Request.QueryString("SubjectID")
  6. 	Dim RawGroupID As String = Request.QueryString("GroupID")
  7. 	Dim RawTypeID As String = Request.QueryString("TypeID")
  8.  
  9. 	' Check for empty string values (querystring value not passed) and
  10. 	' validate the expected data type:
  11. 	'    Array: IsArray(<obj to validate>)
  12. 	'    Date: IsDate(<obj to validate>)
  13. 	'    Integer: Int32.TryParse(<value to parse>, <variable to set if successful)
  14. 	'    
  15. 	If (Not String.IsNullOrEmpty(RawSubjectID) And Int32.TryParse(RawSubjectID, SubjectID)) And _
  16. 	    (Not String.IsNullOrEmpty(RawGroupID) And Int32.TryParse(RawGroupID, GroupID)) And _
  17. 	    (Not String.IsNullOrEmpty(RawSubjectID) And Int32.TryParse(RawTypeID, TypeID)) Then
  18.  
  19. 	    ' Querysting validated, add code here...          
  20.  
  21. 	End If
  22. End Sub

Report this snippet


Comments

RSS Icon Subscribe to comments

You need to login to post a comment.