How do I only allow number input into my C# Console Application?

Question

Console.WriteLine(\"Enter the cost of the item\");                           
string input = Console.ReadLine();
double price = Convert.ToDouble(input);

Answer 1

This MSDN article explains how to read characters one at a time in a console window. Test each character as it is input with the Char.IsNumber() method, and reject those characters that fail the test.