VB.Net program to replace the content of one file with another file and create a backup file

Here, we are going to learn how to replace the content of one file with another file and create a backup file in VB.Net?
Submitted by Nidhi, on January 08, 2021

Here, we will use the Replace() method of the File class to replace the content of one file with another and also create the backup file.

Program/Source Code:

The source code to replace the content of one file with another file and create a backup file is given below. The given program is compiled and executed successfully.

'VB.Net program to replace the content of one file 
'with another file and create the backup file.

Imports System.IO

Module Module1
    Sub Main()
        Dim str As String = Nothing

        Try
            str = File.ReadAllText("sample.txt")
            Console.WriteLine("Content of sample.txt file: ")
            Console.WriteLine(str)

            str = File.ReadAllText("demo.txt")
            Console.WriteLine("Content of demo.txt file: ")
            Console.WriteLine(str)

            File.Replace("sample.txt", "demo.txt", "backup.txt")

            Console.WriteLine(vbCrLf & vbCrLf & "Content After Replace:" & vbCrLf)
            Console.WriteLine("Content of File(demo.txt):")
            str = File.ReadAllText("demo.txt")
            Console.WriteLine(str)

            Console.WriteLine("Content of File(backup.txt):")
            str = File.ReadAllText("backup.txt")
            Console.WriteLine(str)

        Catch ex As FileNotFoundException
            Console.WriteLine("File does not exist")
        End Try
    End Sub
End Module

Output:

Content of sample.txt file:
Hello how are you.
Content of demo.txt file:
it is demo file.


Content After Replace:

Content of File(demo.txt):
Hello how are you.
Content of File(backup.txt):
it is demo file.
Press any key to continue . . .

Explanation:

In the above program, we created a module Module1 that contains the Main() function. The Main() function is the entry point for the program. And, we created a local variable str of string type. After that read data from the "sample.txt" and "demo.txt" file and then replace the content of the "sample.txt" file with "demo.txt" file and create a backup file "backup.txt" using Replace() method of File class.

If any specified file does not exist in the computer system then a file not found exception gets generated and prints the appropriate message on the console screen.






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