C# Random Number

I'm building a random number generator and seeding it with two inputs from the user (numberEntry and integerEntry). I am also requiring the user to press a button for each new random number. I guess my question is this: will this generate a truly random sequence of numbers? Is there a better, more elegant way to do this? I'm new to C# so go easy on me (and my lowly code).

//kinda, sorta, psuedo-random number Method seeded with user inputs

static double NumberMashUp(double numberEntry, int integerEntry)
{
    double pseudoRandom;
    Random rnd = new Random();
    return numberEntry * (pseudoRandom = rnd.Next(1, integerEntry));
}