Open File Text into TextBox and Rich TextBox in Window Application

Step 1: Form

Drag and down a button and a rich Text box from Tool Box.

Step 2: Code

Double click on "Open File " button and write this code. Before this we have to add 2 namespace.

using System.Data.SqlClient;

using System.Text;

namespace First_Csharp_app

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void Button1_click(object sender, EventArgs e)

{

Stream mystream;

OpenFileDialog openfile = new OpenFileDialog ();

if(openfile .ShowDialog() ==System.Window.Forms.DialogResult.OK)

{

if((mystream = openfile .OpenFile() ) ! = null)

string strfilename = openfile .FileName;

String filetext = File.ReadAllText(strfilename);

richTextBox1.text = filetext;

}

}

}

}

Step 3: Code

Run your application and click on "OpenFile" button and select a file.

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