In this blog will learn how
to execute System or DOS Internal and External using C# programming.
(We are not learning what is an Internal and External commands)
(We are not learning what is an Internal and External commands)
-
For that we need
two basic things – an installed .NET Framework and a text editor.
-
We need the text
editor to write and edit the C# code and the .NET Framework to compile and
execute it.
1] .NET Framework:-
By default, the
.NET Framework is installed along with Windows, but in old Windows versions it
could be missing. To install the .NET Framework, we must download it from
Microsoft’s website (http://download.microsoft.com). It is best if we download
and install the latest version.
2] Text Editor
The text editor is used to write the source code of
the program and to save it in a file.
We can use Windows’ built-in Notepad.
Now,
Changing the System Paths in Windows
-
If you are writing a code in
text editor then you must set the path but there is no need to set a path for
visual studio IDE.
Open control panel->system->Advanced System Setting->Advanced->
Environment Variable
-
Click on New button of System
variable panel and enter the Variable Name as Path and Variable value as ” C:\Windows\Microsoft.NET\Framework64\v4.0.30319;”
semicolon (;) is compulsory.
Note:
This path could vary depending on the .NET framework
version installed on your machine.
-
For the compiling C# program
we need C-Sharp Compiler, CSC is Command for compiling
a C# program.
-
Before setting the environment
variable it shows the following error.
-After Setting the environment variable it
shows the following message
Now, we are going to actual our program
-
First we will learn how to execute
a simple command in C# program
-
Following code write in
notepad editor and save it as MyProcess.cs
_______________________________________________________________________________________________
namespace MyProcess
{
class Program
{
static void Main(string[] args)
{
System.Diagnostics.Process.Start("notepad");
}
}
}
_______________________________________________________________________________________________
For compiling above program we use CSC command like,
CSC MyProcess.cs
-
This command generate MyProcess.exe
file
-
For run above .exe write only name and hit the
enter
MyProgram.exe (and hit the enter)
Above program will open the notepad process.
Note: -
Note: -
Each command
after executing become process that’s why there is a process class
1. Now we will learn how to execute an external commands.
-
Following program showing how to
execute an external commands.
_______________________________________________________________________________________________
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SystemCommand
{
class Program
{
static void Main(string[] args)
{
Console.Title="Command using C# !!!";
int n = 0;
do
{
Console.WriteLine("1 : Wordpad");
Console.WriteLine("2 : Notepad");
Console.WriteLine("3 : Ms-Powerpoint");
Console.WriteLine("4 : Ms-Excel");
Console.WriteLine("5 : Ms-Access");
Console.WriteLine("6 : Ms-Word");
Console.WriteLine("7 : Ms-Pint");
Console.WriteLine("8 : Exit");
n = Convert.ToInt32(Console.ReadLine());
switch(n)
{
case 1:
System.Diagnostics.Process.Start("wordpad");
break;
case 2:
System.Diagnostics.Process.Start("notepad");
break;
case 3:
System.Diagnostics.Process.Start("powerpnt");
break;
case 4:
System.Diagnostics.Process.Start("excel");
break;
case 5:
System.Diagnostics.Process.Start("msaccess");
break;
case 6:
System.Diagnostics.Process.Start("winword");
break;
case 7:
System.Diagnostics.Process.Start("mspaint");
break;
case 8:
System.Environment.Exit(0);
break;
default :
Console.WriteLine("Wrong Choice!!");
break;
}
Console.Clear();
} while (n != 0);
}
}
}
_______________________________________________________________________________________________
2. Now we will learn how to execute an internal commands.
-
Following program showing how to
execute an internal commands.
_______________________________________________________________________________________________
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DosCommandWithRedirection
{
class Program
{
static void Main(string[] args)
{
// start the Command Prompt
ProcessStartInfo processStartInfo = new ProcessStartInfo("cmd.exe");
//join the input pipe to Command
Prompt
processStartInfo.RedirectStandardInput = true;
//join the output pipe to our
program(process)
processStartInfo.RedirectStandardOutput = true;
processStartInfo.UseShellExecute = false;
Process process = Process.Start(processStartInfo);
if (process != null)
{
//create a folder with a name
'Ashutosh'
process.StandardInput.WriteLine(@"mkdir D:\Ashutosh");
//write all information about folder into 'ashu.txt'
process.StandardInput.WriteLine(@"dir>D:/Ashutosh/ashu.txt");
//print on Console
process.StandardInput.WriteLine("echo Thanks..");
// line added to stop process from
hanging on ReadToEnd()
process.StandardInput.Close();
// all output of console copy into
string
string outputString = process.StandardOutput.ReadToEnd();
//print that output
Console.WriteLine(outputString);
//hold the console screen
Console.ReadKey();
}
}
}
}
________________________________________________________________________________________________________
________________________________________________________________________________________________________
Explanation:
-
StandardInput class is use for giving the command to Command Prompt and WriteLine()
method write the command on Command Prompt
-
StandardOutput class is use for taking the output from Command Prompt and ReadToEnd()
method is use for read the output to the end and written into string
Note:-
We can perform all tasks using
above program whatever we can perform using Command Prompt.
-Created By
Ashutosh Jagtap,
For
any grievance mail us on
ashujagtap333@gmail.com 
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