my micro sd card doesnt work?

my micro sd card worked fine then i took it out of my adapter and put in another micro sd card to transfer some stuff onto it. the other sd card was on my desk and wasnt touched. 10 mins later i replaced the original sd card into the adapter and it had stopped working. i have tried it in different ports on m coputer to make sure it isnt that. does anyone have any ides how i can fix this. the emory card doesnt read at all so i cant re format it either