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json array

Posted By:      Posted Date: October 21, 2010    Points: 0   Category :ASP.Net

i am new to json array... i cant understand one bit of this concept

i am pasting a code here. can any1  explain me this code

if (Request.QueryString["Tab"] == "Overview")
                sReturnVal = "{\"array_list\":{\"list\":[";
                sReturnVal += "{\"Source\":'" + Request.QueryString["Tab"] + "'}]";
                string strVal = "";

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