Hello Experts

I need to update the older version of ext.net with new version (pro.1.3).
for that i m replacing the older Ext.Net.dll,Ext.Net.Utilities.dll,Newtonsoft.Json. dll with new version dlls,
please tell me i m going on right track or not ? :)

because when i replaced dlls and compiled project again then is shows error like
Type 'Ext.Net.Button' is not defined.
for all previous used Ext controls