How to have a verbatim string literal inside a verbatim string literal?

Question

How can I stores something like the following string in C#:

string mystring = @"CMD.AddParameters("@Pkey", SqlDbType.Int, Pkey.ToString());";

Answer 1

string mystring = "CMD.AddParameters(\"@Pkey\", SqlDbType.Int, Pkey.ToString());";

or

string mystring = @"CMD.AddParameters(""@Pkey"", SqlDbType.Int, Pkey.ToString());";