Append data to Gridview ASP.NET

I have a gridview where I am loading some data with an image in a single templatefield. The image is loaded in the RowDataBound as it needs to do some binding and other checks. What I am trying to implement is a show more button at the bottom of the grid to load the next 10 results in the grid. The problem is that I do not want to bind the data because then the rowdatabound event is going to get called again for the first 10 results which I dont want because the image binding takes some time to process. I just want to be able to append the next 10 results by calling the database to get the data and then only call the rowdatabound for those new results while leaving the first 10 results as is. Need help in figuring out the best process and method to do this. First person to show me a working example of what I want will win the bid. Should be a very simple project for an expert .net developer. Good luck