problem while implementing AvailabilityClassName?

[prasannamurumkar]

i have dll and command name which is calling on button.

I want to enable button at zero document state. for that i am using AvailabilityClassName 

when  i give name in AvailabilityClassName. .while running it shows error as class has not inherit the IexternalCommandAvailability.

I know it is require to implement Iexternal Availavbility in that class.

But i have only dll and command. class is not available with me.How can  implement

AvailabilityClassName property?

[prasannamurumkar]

i have dll and command name which is calling on button.

I want to enable button at zero document state. for that i am using AvailabilityClassName 

when  i give name in AvailabilityClassName. .while running it shows error as class has not inherit the IexternalCommandAvailability.

I know it is require to implement Iexternal Availavbility in that class.

But i have only dll and command. class is not available with me.How can  implement

AvailabilityClassName property?

[jeremytammik · Accepted solution]

Use an IL disassembly tool to explore and determine the exact class name in the .NET assembly DLl: 

https://duckduckgo.com/?q=il+disassembly

[jeremytammik · Accepted solution]

Use an IL disassembly tool to explore and determine the exact class name in the .NET assembly DLl: 

https://duckduckgo.com/?q=il+disassembly