Does var keyword in C# cause boxing?

Question

My boss forbids me to use var as it would cause boxing and slowing down the app.

Is that true?

Answer 1

Following on from Aakash's answer, here is the IL: (thanks LINQPad)

WithInt:
IL_0000:  ldc.i4.5    
IL_0001:  stloc.0     
IL_0002:  ldloc.0     
IL_0003:  call        System.Console.WriteLine
IL_0008:  ret         

WithVar:
IL_0000:  ldc.i4.5    
IL_0001:  stloc.0     
IL_0002:  ldloc.0     
IL_0003:  call        System.Console.WriteLine
IL_0008:  ret