How to Read Data from a Text File using C#

[Doughboy]

Today, I will teach you to create a program that can read the data from a text file using C#.

Now, let's start this tutorial!

1. Open Notepad. Put any data in there, for example, i have write "Sourcecodester is the best!". Save it to the C directory with folder named file and named it as data.txt.

2. Create a Windows Form Application in C# for this tutorial by following the following steps in Microsoft Visual Studio: Go to File, click New Project, and choose Windows Application.

3. Next, add only one Button named btnRead and labeled it as "Read". Insert two textboxes named txtInput for inputting the source file and path of the text file that we wanted to read, and txtOutput to display the content of our text file. You must design your interface like this:

4. In your btnRead, put this code below.

Create a string variable named pathfile that will hold the text inputted in txtInput.

1. string
   
   pathfile =
   
   txtInput.
   
   Text
   
   ;
   

Initialize the System.IO.StreamReader having a file variable. This will locate the file and path of our inputted source.

1. System.IO
   
   .
   
   StreamReader
   
   File =
   
   new
   
   System.IO
   
   .
   
   StreamReader
   
   (
   
   pathfile)
   
   ;
   

Code for reading the file.

1. string
   
   data =
   
   File.
   
   ReadToEnd
   
   (
   
   )
   
   ;
   

Close your file.

1. File.
   
   Close
   
   (
   
   )
   
   ;
   

Display the content of our file and will be viewed in txtOutput.

1. txtOutput.
   
   Text
   
   =
   
   data;
   

Full source code:

1. using
   
   System
   
   ;
   
2. using
   
   System.Collections.Generic
   
   ;
   
3. using
   
   System.ComponentModel
   
   ;
   
4. using
   
   System.Data
   
   ;
   
5. using
   
   System.Drawing
   
   ;
   
6. using
   
   System.Text
   
   ;
   
7. using
   
   System.Windows.Forms
   
   ;
   
8. 
   
9. namespace
   
   Read_Data_from_TextFile_CSharp
   
10. {
    
11. public
    
    partial
    
    class
    
    Form1 :
    
    Form
    
12. {
    
13. public
    
    Form1(
    
    )
    
14. {
    
15. InitializeComponent(
    
    )
    
    ;
    
16. }
    
17. 
    
18. private
    
    void
    
    btnRead_Click(
    
    object
    
    sender, EventArgs e)
    
19. {
    
20. // change the path of your file
    
21. 
    
22. // string pathfile = @"C:/files/data.txt";
    
23. string
    
    pathfile =
    
    txtInput.
    
    Text
    
    ;
    
24. System.IO
    
    .
    
    StreamReader
    
    File =
    
    new
    
    System.IO
    
    .
    
    StreamReader
    
    (
    
    pathfile)
    
    ;
    
25. 
    
26. string
    
    data =
    
    File.
    
    ReadToEnd
    
    (
    
    )
    
    ;
    
27. File.
    
    Close
    
    (
    
    )
    
    ;
    
28. txtOutput.
    
    Text
    
    =
    
    data;
    
29. }
    
30. }
    
31. }
    

Press "F5" to run the program.

Output:

Hope this helps! :)

Best Regards,

Engr. Lyndon Bermoy
IT Instructor/System Developer/Android Developer/Freelance Programmer

If you have some queries, feel free to contact the number or e-mail below.
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