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();