I am trying to create property page to SOE in arcserver 10.2 but I don't find Missing ESRI.ArcGIS.ServerManager dll so could anyone help me to solve this problem.
There is a ESRI.ArcGIS.Server.dll and ESRI.ArcGIS.SOESupport.dll in your Program Files (x86)\ArcGIS\DeveloperKit10.2\DotNet directory. There is no more ServerManager.dll as it is unnecessary with SOE's. That was a DLL needed in version 9.x to reach ArcObjects. It was rendered obsolete when version 10.1 came out. Now you can just reference the ArcObjects DLL's directly.
Thanks for reply, I am trying to create SOE propoerty page so I have added ESRI.ArcGIS.SOESupport.dll as a reference in my solution but still don't find this interface "IServerObjectExtensionConfigurator".
I following this example at the second part to create the property page for SOE :
ArcObjects 10 .NET SDK Help
Retrieving data ...