int a = ;

Console.WriteLine(a.ToString("X"));                   //10进制转16进制

Console.WriteLine(Convert.ToString(a, ));     //10进制转16进制

Console.WriteLine(Convert.ToString(a, ));       //10进制转2进制

string b = "";

Console.WriteLine(Convert.ToInt32(b, ));       //2进制转10进制

Console.WriteLine(string.Format("{0:X}", Convert.ToInt32(b, )));//2进制转16进制

int c = 0x0a;

Console.WriteLine(Convert.ToString(c, ));      //16进制转2进制

Console.WriteLine(Convert.ToString(c, ));     //16进制转10进制