The document provides instructions on how to execute C# programs and includes examples of simple C# programs. It discusses installing the .NET framework, setting the PATH variable, using commands like "csc" and "dotnet" to compile and run programs. Example programs shown include adding two numbers, displaying command line arguments, using the Math class, and handling exceptions. Custom exception classes are also demonstrated.

1. C# PROGRAMMING
By
Prof. A. Syed Mustafa

2. How to execute a C# program?
Install setup package named dotNetFx40_Full_setup.exe can be
downloaded from Microsoft’s general download area
http://www.microsoft.com/en-us/download/details.aspx?id=17851
Set Path varable through Mycomputer’s property –Environment
Variable
PATH: C:WINDOWSMicrosoft.NETFrameworkv4.0.30319
Use Command prompt and then type the following command for
compilation :
c:mydircsc programname.cs
To run the C# program
c:mydirprogramname
Prof. Syed Mustafa(Ph.D) 2

3. Program to add 2 numbers
// type the program in notepad & save the program as
“add.cs”
using System;
class add
{
public static void Main()
{
Console.WriteLine("Enter 2 numbers");
int a=int.Parse(Console.ReadLine());
int b=int.Parse(Console.ReadLine());
int c=a+b;
Console.WriteLine("sum of "+a+" and "+b+" is "+c);
}
}
Prof. Syed Mustafa(Ph.D) 3

4. Program to display Command line
arguments
// type the program in notepad & save the program as
“cmd.cs”
using System;
class cmd
{
public static void Main(string[] s )
{
Console.WriteLine("command line arguments");
for(int i=0;i<s.Length;i++)
Console.WriteLine(s[i]);
}
}
Prof. Syed Mustafa(Ph.D) 4

5. Program to display Command line
arguments
// type the program in notepad & save the program as
“cmd.cs”
using System;
class cmd
{
public static void Main(string[] s )
{
Console.WriteLine("command line arguments");
foreach(string i in s)
Console.WriteLine(i);
}
}
Prof. Syed Mustafa(Ph.D) 5

6. Program to display Command line
arguments
// type the program in notepad & save the program as
“cmd.cs”
using System;
class cmd
{
public static void Main(string[] s )
{
string[] a=Environment.GetCommandLineArgs();
Console.WriteLine("command line arguments");
for(int i=1;i<a.Length;i++) //s[0] is cmd.cs, here s[1] is
first argument
Console.WriteLine(a[i]);
}
} Prof. Syed Mustafa(Ph.D) 6

7. Program to use Math class
using System;
class sqt
{
public static void Main()
{
Console.WriteLine("Enter number");
int n=int.Parse(Console.ReadLine());
double r=Math.Sqrt(n);
Console.WriteLine("square root of "+n+" is "+r);
}
}
Prof. Syed Mustafa(Ph.D) 7

8. Program to use Exception
using System;
class Except1
{
public static void Main()
{
try{
int a=5,b=0;
Console.Write(“Multiple Exception");
int c=a/b;
Console.WriteLine("C="+c);
}catch(DivideByZeroException e)
{
Console.WriteLine("Divide by 0 Error");
}catch(ArithmeticException ae)
{
Console.WriteLine("Arithmetic Error");
}
}
}
Prof. Syed Mustafa(Ph.D) 8

9. Program to use Exception
using System;
class Except1
{
public static void Main()
{
try{
int a=5,b=0;
Console.Write(“Multiple Exception");
int c=a/b;
Console.WriteLine("C="+c);
}catch(DivideByZeroException e)
{
Console.WriteLine("Divide by 0 Error");
}catch(ArithmeticException ae)
{
Console.WriteLine("Arithmetic Error");
} finally
{
Console.WriteLine("From finally...");
}
}
}
Prof. Syed Mustafa(Ph.D) 9

10. Program to use Exception
using System;
class Except3
{
public static void Main()
{
try{
int age=14;
if (age<15) throw new ArithmeticException();
Console.WriteLine("Age=" + age);
}catch(ArithmeticException ae)
{
Console.WriteLine("Age Error...");
}finally
{
Console.WriteLine("From finally...");
}
}
}
Prof. Syed Mustafa(Ph.D) 10

11. Program to use Exception
using System;
class Except4
{
public static void Main()
{
int a=893434,b=78888;
try{
int c=checked(a*b);
Console.WriteLine("a=" + a);
}catch(OverflowException ae)
{
Console.WriteLine("Overflow Error...“+ae.Message);
Console.WriteLine(“Source Error...“+ae.Source);
}finally
{
Console.WriteLine("From finally...");
}
}
}
Prof. Syed Mustafa(Ph.D) 11

12. Program to use Exception
using System;
class Except
{
public static void Main()
{
try{
int a=5,b=0;
Console.WriteLine(“Exception");
int c=a/b;
Console.WriteLine("C="+c);
}catch(DivideByZeroException e)
{
Console.WriteLine("Divide by 0 Error: "+e);
Console.WriteLine("Error Message is: "+e.Message);
Console.WriteLine("Stack trace is: "+e.StackTrace);
Console.WriteLine("Error Source is: "+e.Source);
Console.WriteLine("Target Site is: "+e.TargetSite);
Console.WriteLine("HelpLink is: "+e.HelpLink);
}
}
}
Prof. Syed Mustafa(Ph.D) 12

13. Program to use customized Exception
using System;
class AgeException:Exception
{public AgeException(String msg):base(msg){ }
}
class Except4custom
{public static void Main()
{ int age=4;
try{
if(age<15) throw new AgeException("Under Age");
Console.WriteLine("age=" + age);
}catch(AgeException ae)
{
Console.WriteLine("Error is...:"+ae);
}finally
{
Console.WriteLine("From finally...");
}
}
}
Prof. Syed Mustafa(Ph.D) 13

14. Program to use customized Exception
using System;
class AgeException:Exception
{String m;
public AgeException(String msg)
{m=msg;
}
public override string Message
{
get { return m; }
}
}
class Except4custom2
{public static void Main()
{ int age=4;
try{
if(age<15) throw new AgeException("Under Age");
Console.WriteLine("age=" + age);
}catch(AgeException ae)
{
Console.WriteLine("Error is...:"+ae.Message);
}
}
Prof. Syed Mustafa(Ph.D) 14
}

15. Program to use customized Exception
using System;
class AgeException:Exception
{ String m;
public AgeException(String msg)
{m=msg;
}
public override string Message
{
get { m+="Age is not valid"; return m; }
}
}
class Except4custom1
{ public static void Main()
{ int age=4;
try{
if(age<15) throw new AgeException("Under Age");
Console.WriteLine("age=" + age);
}catch(AgeException ae)
{
Console.WriteLine("Error is...:"+ae.Message);
}
}
Prof. Syed Mustafa(Ph.D) 15
}