DataGridView to Bitmap -- DataSource Problem

Question

Hello guys.i read the article here -- http://www.c-sharpcorner.com/UploadFile/scottlysle/DGV2BMP01182007020129AM/DGV2BMP.aspx

I tried several times but i can't change data source with my data source, because of this, nothing is retrieving in datagridview and throwing an error....

please help guys... :(