Read a large Text File ( 250 MB) And Write in TextBox C#

Question

i am Working on a Project on tech asp.net C# I Have a Notepad file almost 250 MB i want to Write its Text on TextBox I used this Code but it taking too much time at last Throwing error OutOfMemoryException any one can suggest me what is the Easiest way. Here is the Code Below. StringBuilder fileText = new StringBuilder(); using (FileStream fs = File.Open(FilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) using (BufferedStream bs = new BufferedStream(fs)) using (StreamReader sr = new StreamReader(bs)) { string line = ""; txtReader.Text = ""; while ((line = sr.ReadLine()) != null) { //fileText.AppendLine(line); txtReader.Text += line.ToString(); } } txtReader.Text = fileText.ToString();

Manav Pandya · Answer

Hello You can do as per BufferedStream , can specify size you want Without trying you can not judge . Thank you should use RichTextBox instead textbox Following post may help you : https://msdn.microsoft.com/en-us/library/system.windows.forms.richtextbox.loadfile.aspx http://www.dreamincode.net/forums/topic/343670-loading-large-text-files-in-a-richtextbox-outofmemoryexception/ https://www.codeproject.com/Questions/101293/Import-of-txt-file-into-textbox Thanks

Amit Gupta · Answer

Hey Have you tried using async/await processing, it will not freeze your UI and able to perform the task smoother Update: You can also use richtextbox control and load the file

Rahul Singh · Answer

File size is too large @Manav Your Code is not working

Rahul Singh · Answer

I Already used this code. see my link below i given a same code which thrown error of out of memory execption. because file size is large. @Manav

Manav Pandya · Answer

Try following snippet : using (FileStream fs = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) { using (BufferedStream bs = new BufferedStream(fs)) { using (StreamReader sr = new StreamReader(bs)) { string line; while ((line = sr.ReadLine()) != null) { } } } } Thanks

Manav Pandya · Answer

Hello You can try as following snippet : // Select your file and load data inside textbox textbox1.Text = File.ReadAllText(filedialog.FileName); Still you need any help , let me know For more batter help , and two way reading of text file find following link : https://social.msdn.microsoft.com/Forums/vstudio/en-US/b41e6115-f19e-4be2-be7e-f2fcd80dc64d/how-do-i-save-the-text-in-textbox-to-text-file-and-then-read-it-back-and-add-the-text-in-the-textbox?forum=csharpgeneral Thanks

Sagar Pandurang Kap · Answer

Hi, try below code :- using System; using System.IO; namespace csharp_station.howto { class TextFileReader { static void Main(string[] args) { // create reader & open file Textreader tr = new StreamReader("date.txt"); // read a line of text Console.WriteLine(tr.ReadLine()); // close the stream tr.Close(); } } } Hope it helps...