Simple script to find the largest number palindrome
For getting integers (or any other data that needs to be validated) from the user, sometimes it's best to create a separate function that you can call. For example:

static int GetIntFromUser(string prompt)
{
    int input;

    while (true)
    {
        if (prompt != null) Console.Write(prompt);
        if (int.TryParse(Console.ReadLine(), out input)) break;
        Console.WriteLine("Sorry, {0} is not a valid integer. Please try again.", input);
    }

    return input;
}


Then you can use it like:

int max = GetIntFromUser("Enter the maximum value for these numbers: ");
int min = GetIntFromUser("Enter the minimum value for these numbers: ");