How to convert unmanaged char to string

I have a dll that is compiled with win32 and clr functions.  I have a function that passes the following
char variable, const char* varible1, const char* var3

I want to convert all of these to System:string.  I am able to convert the const Char* without trouble but when I convert the char I get the numeric value instead of the character.  (example the variable is the drive letter - after converstion I get 101 in my string instead of 'e'.)

I am using this to convert the const Char*
 System::String ^ oId = Marshal::PtrToStringAnsi((IntPtr) (char *) var);

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