Open File Text into TextBox and Rich TextBox in Window Application

Here, I will explain how to use 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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