error msg while closing vb.net project

[Pravin H]

Hello, I made a small project with datagrid and tabcontrol till yesterday everthing was fine but yesterday when i was running my project it got hanged. Now when I am debugging this project its ok but when I am closing the project it gives me this error "The Following exception has occured NUllreference Exception: Object reference not set to an instance of an object. okbutton. then it closes. Kindly help me to trace this error as on debug it doesnot show and even when i created a setup file and used it no error. This error occurs only when I close only this project in vb. I tried to check each and every codes but no errors. How can i find where is this error coming from Thanks in advance Regards