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And: This shows us that the Single type is the same as the float type, and the Double type is the same as the (lowercase) double type.
C# program that uses Single and Double
using System;
class Program
{
    static void Main()
    {
        {
            Single a = 1;
            Double b = 1;
            Console.WriteLine(a.GetType());
            Console.WriteLine(b.GetType());
        }
        {
            float a = 1;
            double b = 1;
            Console.WriteLine(a.GetType());
            Console.WriteLine(b.GetType());
        }
    }
}
Output
System.Single
System.Double
System.Single
System.Double
Tip: Code written with float is less likely to confuse other programmers who might then introduce bugs.
Type information
 float -> Single
double -> Double