Quickly Replace the Contents of a Text File using C# or VB.NET

In this post, I will show you how to use the File class to quickly replace the contents of a Text File. Check the contents of the Sample.txt file given below.

We will replace the @ with [attherate] and also list the emails one after the other separated by a semicolon(;). Here’s the code to do so:

C#

try
{
    string replaceString = string.Join(";",
                            File.ReadAllLines("D:\\sample.txt")
                            ).Replace("@", "[attherate]");

    File.WriteAllText("D:\\sample.txt", replaceString);
    Console.WriteLine("Done");
    Console.ReadLine();
}
catch (Exception ex)
{
    // handle ex
}

VB.NET

Try
    Dim replaceString As String = String.Join(";", _
        File.ReadAllLines("D:\sample.txt")).Replace("@", "[attherate]")

    File.WriteAllText("D:\sample.txt", replaceString)
    Console.WriteLine("Done")
    Console.ReadLine()
Catch ex As Exception
    ' handle ex
End Try

After running the code, the output is as shown below

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About The Author

Suprotim Agarwal, ASP.NET Architecture MVP works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls.

Follow him on twitter @suprotimagarwal