unknown error wen using two forms in window form application

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.NET3.5

C#

.NET

ADO.NET

Error	1	Unable to copy file "obj\x86\Debug\voy_wfa1.exe" to "bin\Debug\voy_wfa1.exe". The process cannot access the file 'bin\Debug\voy_wfa1.exe' because it is being used by another process.	voy_wfa1

ok im getting this error and have tried to find a soln before but not a soln that getting rid of my prob.
ok wen i create two forms i add values into one and store in in the after that i want to close the current form and open a form which has a button click which on click displays a data grid view with the data


i used the :

this.Close();
Form2 obj = new Form2();
obj.Show();

but on building im getting the error mentioned above. any solution pls. Im a newbie to the .net world.
Thanks for ur help.