error in coding of selecting checkbox

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Error:-
Object reference not set to an instance of an object.

Source Error:

C#

CheckBox cBox = (CheckBox)contact.FindControl("cbSelect");  //here it gives error...
           if (cBox.Checked)
           {

Plz Help me to solve this error.....

Posted 15-Jun-12 18:27pm

Member 9027483

Updated 15-Jun-12 19:30pm

Sandeep Mewara

v2

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Comments

Tejas Vaishnav 16-Jun-12 0:50am

please provide proper code so we can check why you should get this type of error.

hitech_s 16-Jun-12 2:38am

provide code in .aspx page

Yatin chauhan 16-Jun-12 2:48am

your checkbox return null value thats y its give error. plz debuge and check that.

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Sandeep Mewara · Answer 1 · 2012-06-15T19:29:00

Object reference not set to an instance of an object
This error happens when you try to use a property or call a method of an object that is null. More details: here[^]

A simple use of Visual studio DEBUGGER can tell you the object because of which it is happening. Just look at the stack trace and put a debugger on that line. Check the objects of that line and see if any one is null and you are trying to use that objects property. Handle the same.

For now, error in line below

CheckBox cBox = (CheckBox)contact.FindControl("cbSelect");

means that there was no control named 'cbSelect' in the 'contact' object. contact.FindControl("cbSelect") returned null. Now, when you try to cast it into CheckBox, it throw error.

Verify that the name is correct and exists in the control object contact. Put a null check too.

AmitKumar89 · Answer 2 · 2012-06-15T20:41:00

Hi,

First of all let me tell you one thing that your code is unable to find your control. What is "contact" actually? any place holder or any panel or any form?

Follow the links given to find your answer:
http://odetocode.com/articles/116.aspx[^]
http://msdn.microsoft.com/en-us/library/486wc64h.aspx[^]

All the best.

error in coding of selecting checkbox

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