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Here is my code but I am having an error saying that Convert is not declared and the code is not working.  What did I do wrong, please?

Here is my code but I am having an error saying that Convert is not declared and the code is not working.  What did I do wrong, please?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Microsoft Visual C# 7th Edition
Instruction: DebugEight3.cs has syntax and/or logical errors. Determine the problem(s), and fix the program.
 
Here is my code but I am having an error saying that Convert is not declared and the code is not working.  What did I do wrong, please?
 
// Program demonstrates method that can be called
// with one, two, or three arguments
// Tuition is $80 per credit
// Default district code is I.
// If student is in-district (code I), then there is no
// out-of-district fee, which is $300
// Default scholarship status is false.
// If student is on scholarship, tuition is free
using static System.Console;
class DebugEight3
{
   static void Main()
   {
     double credits;
     char code='I';
     bool isScholarship=false;
     string numCredit;
     WriteLine("Enter number of credit");
     numCredit = ReadLine();
    credits = Convert.ToDouble(numCredit);
    double tuition;
    tuition=CalculateTuition(credits,code, isScholarship);
     
      WriteLine("Tuition is {0}", CalculateTuition(credits,code,  isScholarship));
      WriteLine("Tuition is {0}", CalculateTuition(credits,code,  isScholarship));
      WriteLine("Tuition is {0}", CalculateTuition(credits, code, isScholarship));
   }
    public static double CalculateTuition(double credits, char code, bool scholarship)
   {
    bool isScholarship=false;
      double tuition;
      const double RATE = 80.00;
      const double OUT_DISTRICT_FEE = 300.00;
      tuition = credits * RATE;

      if(code != 'I')
         tuition += OUT_DISTRICT_FEE;
      else 
      tuition=credits * RATE;
      if(isScholarship)
         {tuition = 0;
         isScholarship=true;}
      return tuition;

   }
}
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