Please Help! I am a System Developer at a private company and I encounter this error while I was playing at my codes. I am using Visual Studio 2010 and my database is MSSQL 2008 R2. I keep on searching on the net for the answer but I failed. Please help me with this one and Thank you in advance.

The process is so simple that is only to populate the datagridview with data then save it to the database. Then on the process of saving...