The error Occured "Object Reference not set to an instance of an object"

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I am using combobox column in datagridview. I want to print the selected values in combobox column. So I give

datagridview1.Rows(0).Cell(0).value. Tostring

But the following Error is displayed

"Object Reference not set to an Instance of an object"

How can I solve this Problem. Please anybody Known help me

Thank you

Posted 26-Feb-12 17:20pm

devausha

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Orcun Iyigun 26-Feb-12 23:22pm

have you tried using breakpoint to hat line and see what is the value that you are getting?

Sergey Alexandrovich Kryukov 26-Feb-12 23:57pm

I'm thinking about marking such questions as off-topic. Why? Because this is a site for software developers and students. And a most rudimentary skill of the software developers is ~~making things fly~~ using the debugger. This exception is so easy to discover that using the debugger is the only required skill.
--SA

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Dhol Gaurav · Answer 1 · 2012-02-26T17:27:00

Solution 1

there are may possibility, check value of below code.

1) datagridview1.Rows(0), might be you are getting this value as NULL
2) datagridview1.Rows(0).Cell(0) also check the value of this
3) datagridview1.Rows(0).Cell(0).value

from the above you may get one of the value NULL

Posted 26-Feb-12 17:27pm

Dhol Gaurav

Comments

Sergey Alexandrovich Kryukov 26-Feb-12 23:54pm

And one more, less likely: datagridview1 is null. My 5, anyway.
--SA

Sergey Alexandrovich Kryukov 26-Feb-12 23:58pm

But more appropriate answer would be "use the debugger" -- please see my comment to the question.
--SA

Dhol Gaurav 27-Feb-12 0:26am

ya right and we can easily solve this error by debugging, and this is the most most common error in the programing world :)

Varun Sareen · Answer 2 · 2012-02-26T17:51:00

This is a very common error in programming which usually occurs when a control Or variable is not being initialized and the value from it is being used for computation.

Please refer this link for general reasons as to why this error occurs:- http://codebetter.com/raymondlewallen/2005/06/23/system-nullreferenceexception-object-reference-not-set-to-an-instance-of-an-object-3-common-causes-in-vb-net/[^]

Please don't forget to mark this as your answer if it helps you out.

Thanks