"Go to Defination" is disabled in visual studio

Today When I was working with Visual Studio, "Go to Defination" didn't work, infact its disabled.

I just search in Google, got the solution, here is it for you:

For ASP.NET solutions

1. close your solution.
2. delete hidden .sou file in folder where your solution's .sln file exists.
3. open your solution.
4. rebuild your solution.

Thats it, problem solved!!!

Happy programming :)