C# File Handling with Dialogs

Introduction

File data needs to be processed in nearly every non-trivial program, and the classes in the base class library that you can use have lots of details. With these benchmarks and examples focused on file IO in the C# language, we evaluate file handling.

Dialog boxes are used to gather input from users. You can create your own dialog boxes or use the built-in dialog boxes.

Dialogs

OpenFileDialog
SaveFileDialog
FolderBrowserDialog
FontDialog
ColorDialog

Design

In the design form section ,drag 'n drop dialogs, a richtextbox and five button control as show below:

Program

using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
namespace filehanding
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
StreamReader sr = new StreamReader(openFileDialog1.FileName);
richTextBox1.Text=sr.ReadToEnd();
sr.Close();
}
}
private void button3_Click(object sender, EventArgs e)
{
FontDialog font = new FontDialog();
if (font.ShowDialog() != DialogResult.Cancel)
{
richTextBox1.Font = font.Font;
}
}
private void button4_Click(object sender, EventArgs e)
{
if (colorDialog1.ShowDialog() != DialogResult.Cancel)
{
richTextBox1.ForeColor = colorDialog1.Color;
}
}
private void button2_Click_1(object sender, EventArgs e)
{
//saveFileDialog1.Filter = "txt files (*.txt)|*.txt";
saveFileDialog1.Filter = "txt files (*.doc)|*.doc";
if (saveFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK && saveFileDialog1.FileName.Length > 0)
{
richTextBox1.SaveFile(saveFileDialog1.FileName,RichTextBoxStreamType.PlainText);
}
}
private void button5_Click(object sender, EventArgs e)
{
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
richTextBox1.Text = folderBrowserDialog1.SelectedPath;
}

}
}
}

Output: To Run hit F5.

Open file Button

Result

Save file Button

Browse folder Button

Result

Font Change Button

Result

Change Color Button

Result