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There is limitation in QueryString also and it vary from browser to browser.

You can check the limit as per given chart.
•    Opera supports ~4050 characters
•    IE 4.0+ supports exactly 2083 characters
•    Netscape 3 -> 4.78 support up to 8192 characters
•    Netscape 6 supports ~2000 [characters]
•    Firefox supports up to 4000