Thread: Help with loading files into rich text box

OK, I followed the Microsoft MSDN and copied their code exactly, and it work for RTF files only, but I want to be able to open text files, html files, php files....basically any files.

The code is:

Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void toolStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {

        }

        public void LoadMyFile()
        {
            // Create an OpenFileDialog to request a file to open.
            OpenFileDialog openFile1 = new OpenFileDialog();

            // Initialize the OpenFileDialog to look for RTF files.

            openFile1.Filter = "Text Files|*.txt"; 

            // Determine whether the user selected a file from the OpenFileDialog.
            if (openFile1.ShowDialog() == System.Windows.Forms.DialogResult.OK &&
               openFile1.FileName.Length > 0)
            {
                // Load the contents of the file into the RichTextBox.
                richTextBox1.LoadFile(openFile1.FileName);
            }
        }

        private void openmenu1_Click(object sender, EventArgs e)
        {
            LoadMyFile();
        }
    }
}

I get this error when I double click on the file to open:

"File Format is not valid", and it relates to this code:

Code:

richTextBox1.LoadFile(openFile1.FileName);

.


I am a beginner in C#, and want to understand how it works,


Thanks,

BP