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I have to use query string passed in url to some link.

I have edit as hyperlink in which i have to pass sid and flag value as query string.But I have to used query string already in url in my link How I will pass flag value.
  1. <Columns>  
  2.                <asp:BoundField DataField="sid" HtmlEncode="false" DataFormatString="<a target='_blank' href='bsepsu.aspx?sid={0}&flag={}'>Edit</a>" />  
  3.         
  4.            </Columns> 
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