Hw To Pass Multiple urls to Imageurl in Gridview in ASP.NET

In ASP.NET,I Have A GridView On A WebForm..Now I Have TO Retrieve The Images From Two Different Tables In Database And Display The Images In Single Column.

To Display The Images in The GridView I Had Used:

 

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But Only Single Image Of Item Is Displaying And The Product Image Is Not Displaying...Pls Help Me....