How to solve "object reference not set to an instance of an object" error in VB.NET-SQL server 2012?

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SQL-Server-2012

Guys I've designed several forms in VB.NET 2013 -SQL Server 2012 and it runs smoothly.
While reopening the saved form, I got an error message as "Object Reference not set to an instance of an object". Unable to solve the error need your guidance.Thanks in advance.

What I have tried:

I can't show my coding since the form is not opening.

Posted 20-May-17 0:14am

nawin.cit

Updated 20-May-17 0:19am

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Richard MacCutchan · Answer 1 · 2017-05-20T00:19:00

Solution 1

VB

Object Reference not set to an instance of an object

The error message means exactly what it says, you are trying to use an object reference that has not been initialised. But the only person who can fix it is you, since you know how your code works, and can run it in the debugger to find the error.

Posted 20-May-17 0:19am

Richard MacCutchan

Comments

nawin.cit 20-May-17 6:25am

First of all thank you for your comment sir.
I can run the form and it works perfectly, but the point is I can't open form to view its coding sir.

Richard MacCutchan 20-May-17 6:39am

What do you mean? If you have the source code then you can view it in any editor.

nawin.cit 20-May-17 7:27am

Sorry Sir I'm new to VB a beginner. Now I can view coding in Notepad. My question is If my coding is wrong it shouldn't compile or it must show an error& warning right?

One more question, after restarting my computer several attempts. I'm now able to view my coding without error. Does it have any other problem?

Richard MacCutchan 20-May-17 8:18am

In general you are right, but occasionally it will get an error which gives the results you saw. Whether your code has any other problems, it is impossible to guess. One of the main things with development is to test your code as much as possible, in order to try and find any and all errors that may exist in it.

nawin.cit 22-May-17 1:01am

Thank you Gentlemen.