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Showing posts with label Online courses VB2010. Show all posts
Showing posts with label Online courses VB2010. Show all posts

Sunday, May 01, 2016

VB 2010 with MS Access 2010 Error Conversion from type 'DBNull' to type 'String' is not valid.

Conversion from type 'DBNull' to type 'String' is not valid.
Error :
Conversion from type 'DBNull' to type 'String' is not valid.
Cause :
Trying to Fetch Data From empty database table field
Solution :


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Tuesday, January 08, 2013

Visual Basic Online Course - Reading / Receiving E-mails in Vb.Net

Visual Basic Online Course - Reading / Receiving E-mails in Vb.Net


I was able to finish the (send E-mail) part successfully, though I've not finished the attachment and the Html parts yet, but the (receiving / reading E-mails) part still out there somewhere I did not do it, though I managed to connect to POP3 servers and receive the +OK response successfully.

Full source code and tutorial about receiving E-mails using VB.net 2010 and POP3 Commands
1) Understanding E-mails - Settings - Start Coding
2) Receiving response from POP3 server
3) Retrieving the number of E-mails from your [Inbox]
4) Solving the POP3 connect\disconnect without errors
5)  Source Code Download
Notes :
-In order to get fully understanding to this topic, you need to read the whole 5 sections as they are already a summary to what i found there.
-There is no direct source code application using VB.Net to receive E-mails from POP3 Client, only this one is available.
- Microsoft did not offer a built-in function that enables you to receive E-mails Using POP3 Commands, so this is just a work around solution and it was tested on Hotmail.com and Gmail.com.
- Gmail.com sometimes uses a 2-steps verification methods, so i had to work that too here.

ENJOY
Regards/ Evry1falls

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