sql server 2005 table filled wih html junk data error

Question

Hello there, I recently faced problem with my website www.zomedia.in. I am using sql server 2005 and asp.net 4.0 with c#. My database tables are automatically filled with some unknown html css junk codes such as (</title <style>.apyk{position:absolute;clip:rect(438px,auto,auto,438px);}</style><div c) (check http://zomedia.in/ZomediaSongs/ZomediaMp3.aspx and you can see the gridview with junk data in it). This junk data automatically filled my tables without any human intervention. My website was working fine and I did not change any coding that might have cause the issue. So, I cusulted my hosting provider and they could not give answer. Could this be error with coding or server error?

Attachment: Green Box is actual data. Red Box is the junk data.