how to copy text file in text box using c#?

Question

i like to copy the whole textfile into multiline textbox ,how can i do these?

Solution 1

 textBox1.Text = System.IO.File.ReadAllText(path);

Solution 2

Use the ReadAllLines method to read the file as an array of strings, and put that in the textbox:

TheTextBox.Lines = File.ReadAllLines(fileName);

Solution 3

Use classes from System.IO namespace (e.g. File).

    using (FileStream fileStream = File.OpenRead("C:\your_file.txt"))
    using (StreamReader streamReader = new StreamReader(fileStream))
    {
        string fileContent = streamReader.ReadToEnd();

        myTextBox.Text = fileContent;
    }