Today, I am going to show you a small demo of how to read, write and delete the text file content in a Windows Forms ListBox control.
Step1
Create one empty text file and named it as your desired name and add into your project, as shown below.

Create one empty text file and named it as your desired name and add into your project, as shown below.

Step 2
Create a form. In my case, I have added a TextBox, a ListBox, and three Button controls. Double click on buttons to add event handlers for these buttons.
Create a form. In my case, I have added a TextBox, a ListBox, and three Button controls. Double click on buttons to add event handlers for these buttons.
Step3
Add using System.IO; namespace in your C# file.
Add using System.IO; namespace in your C# file.
Now, begin writing code for each button click event handler.
Add the new line to the text file.
ADD button click event handler.
- // Declare the File Information
- FileInfo file = new FileInfo(@ "C:\Users\shekhart\documents\visual studio 2013\study\Demo\Demo\Demo.txt");
- // write the line using streamwriter
- using(StreamWriter sw = file.AppendText()) {
- sw.WriteLine(textBox1.Text);
- }
- // Read the content using Streamreader from text file
- using(StreamReader sr = file.OpenText()) {
- string s = "";
- while ((s = sr.ReadLine()) != null) {
- listBox1.Text = s; // Display the text file content to the list box
- }
- sr.Close();
- }
Delete the line from the text file
Write the code given below at the Delete button click event hander.
- string path = @ "C:\Users\shekhart\documents\visual studio 2013\study\Demo\Demo\Demo.txt";
- string word = Convert.ToString(listBox1.SelectedItem); // delete the selected line
- var oldLines = System.IO.File.ReadAllLines(path);
- var newLines = oldLines.Where(line => !line.Contains(word));
- System.IO.File.WriteAllLines(path, newLines);
- FileStream obj = new FileStream(path, FileMode.Append);
- obj.Close();
- // once deleted the selected line and once again read the text file and diplay the new text file in listBox
- FileInfo fi = new FileInfo(@ "C:\Users\shekhart\documents\visual studio 2013\study\Demo\Demo\Demo.txt");
- using(StreamReader sr = fi.OpenText()) {
- string s = "";
- while ((s = sr.ReadLine()) != null) {
- listBox1.Text = s;
- }
- sr.Close();
- }
- FileStream obj1 = new FileStream(path, FileMode.Append);
- obj1.Close();
View the entered content from the text file
Now, write code to view the content of the text file in a ListBox. You can also write this code on Window load event handler.
Now, write code to view the content of the text file in a ListBox. You can also write this code on Window load event handler.
- string[] lines = System.IO.File.ReadAllLines(@ "C:\Users\shekhart\documents\visual studio 2013\study\Demo\Demo\Demo.txt");
- foreach(string line in lines) // Read all line from the text file
- {
- listBox1.Items.Add(line);
- }
The output looks like the following.
Learn more here: Files in C# and .NET.

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