Double - Min

Returns the smaller of two double-precision floating-point numbers.

Try it

public static void Main()
{
    Double  xDouble1 = 7.2,   xDouble2 = 57.5;
	
	// C# Extension Method: Double - Min
	Console.WriteLine("The minimum of {0,3} and {1,3} is {2}.", xDouble1, xDouble2, xDouble1.Min(xDouble2));
}

View Source 
using System;

public static partial class Extensions
{
    /// <summary>
    ///     Returns the smaller of two double-precision floating-point numbers.
    /// </summary>
    /// <param name="val1">The first of two double-precision floating-point numbers to compare.</param>
    /// <param name="val2">The second of two double-precision floating-point numbers to compare.</param>
    /// <returns>Parameter  or , whichever is smaller. If , , or both  and  are equal to ,  is returned.</returns>
    public static Double Min(this Double val1, Double val2)
    {
        return Math.Min(val1, val2);
    }
}