Is it possible to read and write to a file at the same time and display the results in a RichTextBox?

Question

Hi All,
I have a purpose in winforms to have a "notepad like" editor that saves what ever i type to a file on the hard drive and reads from based. 
So what i have is a tab with a richtextbox docked to fill. I would like to have that richtextbox read from a file on the hard drive, then save the changes i type when i either click off the tab or live if possible.
I wills state that i am fairly new to the c# game and if this is possible and someone could post an example that would be awesome and totally appreciated.
Thanks,
jAC

Answer 1

For those that are looking for the solution I went with here are the details
Reading the file:
// Wish List Section
wishListRichTextBox.ResetText();
string wlFolder = Application.StartupPath + "\\wishLists\\";
string wlPath = wlFolder + selectedProduct + ".rtf";
// Read from the text file and out put the results
try
{ // create directory if it does not exist
if (!Directory.Exists(wlFolder))
Directory.CreateDirectory(wlFolder);
} // create file if it does not exist
if (!File.Exists(wlPath))
File.Create(wlPath).Dispose();
var iStream = new FileStream(wlPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
var sr = new System.IO.StreamReader(iStream);
var readData = sr.ReadToEnd();
wishListRichTextBox.Text = readData;
sr.Close();
// If the read fails then output the error message in the same section
catch (Exception ex)
wishListRichTextBox.Text = "Error: " + ex.Message;
Writing the file:
private void wishlistTabChanged(object sender, EventArgs e)
if(menuTabControl.SelectedTab != wishListTab){
if (productComboBox.SelectedIndex >= 0)
try
string wlFolder = Application.StartupPath + "\\wishLists\\";
string wlPath = wlFolder + productComboBox.SelectedItem + ".rtf";
var oStream = new FileStream(wlPath, FileMode.Open, FileAccess.Write, FileShare.Read);
oStream.SetLength(0);
var sw = new System.IO.StreamWriter(oStream);
sw.WriteLine(wishListRichTextBox.Text);
sw.Close();
catch (Exception ex)
MessageBox.Show("Wish list for " + productComboBox.Text + " save failed. \n\nError: " +
ex, "Wish List Save Failed", MessageBoxButtons.OK, MessageBoxIcon.Error);
I mainly used Ammar.Zaied thought
process on this. Thanks to everyone though, as you all pointed me in the right direction