Public Shared Function Exists ( _
    path As String _
) As Boolean

Dim path As String
Dim returnValue As Boolean

returnValue = File.Exists(path)

public static bool Exists (
    string path
)

public:
static bool Exists (
    String^ path
)

public static boolean Exists (
    String path
)

public static function Exists (
    path : String
) : boolean

Imports System
Imports System.IO
Imports System.Text

Public Class Test
    Public Shared Sub Main()
        Dim path As String = "c:\temp\MyTest.txt"
        Dim path2 As String = path + "temp"
        Try
            Dim sw As StreamWriter = File.CreateText(path)
            sw.Close()
            ' Do the Copy operation only if the first file exists
            ' and the second file does not.
            If File.Exists(path) Then
                If File.Exists(path2) Then
                    Console.WriteLine("The target file already exists.")
                Else
                    'try to copy it
                    File.Copy(path, path2)
                    Console.WriteLine("{0} was copied to {1}.", path, path2)
                End If
            Else
                Console.WriteLine("The source file does not exist.")
            End If
        Catch e As Exception
            Console.WriteLine("The process failed: {0}", e.ToString())
        End Try
    End Sub
End Class

using System;
using System.IO;

class Test 
{
    public static void Main() 
    {
        string path = @"c:\temp\MyTest.txt";
        string path2 = path + "temp";
        try 
        {
            using (StreamWriter sw = File.CreateText(path)) {}

            // Only do the Copy operation if the first file exists
            // and the second file does not.
            if (File.Exists(path)) 
            {
                if (File.Exists(path2)) 
                {
                    Console.WriteLine("The target already exists");
                } 
                else 
                {
                    // Try to copy the file.
                    File.Copy(path, path2);
                    Console.WriteLine("{0} was copied to {1}.", path, path2);
                }
            } 
            else 
            {
                Console.WriteLine("The source file does not exist.");
            }
        } 
        catch 
        {
            Console.WriteLine("Double copying is not allowed, as expected.");
        }
    }
}

using namespace System;
using namespace System::IO;

int main()
{
   String^ path = "c:\\temp\\MyTest.txt";
   String^ path2 = String::Concat( path, "temp" );
   try
   {
      StreamWriter^ sw = File::CreateText( path );
      if ( sw )
            delete (IDisposable^)sw;
      
      // Only do the Copy operation if the first file exists
      // and the second file does not.
      if ( File::Exists( path ) )
      {
         if ( File::Exists( path2 ) )
         {
            Console::WriteLine( "The target already exists" );
         }
         else
         {
            // Try to copy the file.
            File::Copy( path, path2 );
            Console::WriteLine( "{0} was copied to {1}.", path, path2 );
         }
      }
      else
      {
         Console::WriteLine( "The source file does not exist." );
      }
   }
   catch ( Exception^ ) 
   {
      Console::WriteLine( "Double copying is not allowed, as expected." );
   }
}

import System.*;
import System.IO.*;

class Test
{
    public static void main(String[] args)
    {
        String path = "c:\\temp\\MyTest.txt";
        String path2 = path + "temp";

        try {            
            StreamWriter sw = File.CreateText(path);
            try {
            }
            finally {
                sw.Dispose();
            }

            // Only do the Copy operation if the first file exists
            // and the second file does not.
            if (File.Exists(path)) {
                if (File.Exists(path2)) {
                    Console.WriteLine("The target already exists");
                }
                else {
                    // Try to copy the file.
                    File.Copy(path, path2);
                    Console.WriteLine("{0} was copied to {1}.", path, path2);
                }
            }
            else {
                Console.WriteLine("The source file does not exist.");
            }
        }
        catch (System.Exception exp) {
            Console.WriteLine("Double copying is not allowed, as expected.");
        }
    } //main
} //Test