how to break the program starts to run with error in

I have set to
tools->options->projects and solutions->on run, when build or deployment errors occur: =" do not lanuch"
I have saved my project and restarted visual studio 2005.
then I opened tha project program runs with error.
I have  changed option "prompt to lanuch",  when I press the  key f5  or shift f5 or build->rebuild myproject.   I saved and restarted visual studio 2005.
 I opened myproject. when I press f5 or shift f5 key, myproject runs event existing 3 errors into current windows form.
I have confused few times  without understanding difference betweent relations of  program output and coding    as the programe has started with error
this is important question for me to understand program and output  occurancy.
my aim is even one error exist , my project must not start to run for any reason.
what to do ?
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You had this question answered previously.
That setting controls the behaviour of VS. Try creating a new dummy project with errors and see if it works.
tamilsoftAuthor Commented:
new project has perfectly works.
if any error found stops the programe to start running.  ok
how to solve in my current project ?
I can not do anything further movement in this project untill this problem will solve.
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Try renaming the suo file in the solution root folder. This file is hidden.

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tamilsoftAuthor Commented:
super  expert mister "codecruiser". my problem has solved as very very super.
thank you.  

I have renamed  .suo extension file into my project folder.  then I started my program with some error. programe has stopped to run. then I have cleared error . then programme runs with new added codiing.

thank you.

what is the reason ?
how is it ?
what is the purpose of .suo file ?
how it solved on account of renamed .suo file ?
I want clear explaination .

Here is clear explanation. SUO stands for Solution User Options. Its an options file which stores solution specific options of visual studio and it was overriding your setting so renaming it made VS recreate it with your new setting.
tamilsoftAuthor Commented:
super mister "codecruiser"
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