How to have .contains check if a String contains any numbers

I am working on a Text Based Game in Visual Studio (Console Application) I am very confused on what to do with .contains checking for numbers with only using one If statement

            if (inputname.Contains("0"))
            {
            Console.Clear();
            Console.WriteLine("Name can not contain numbers");
            Thread.Sleep(500);
            Console.WriteLine("\n");
            goto start;
        }