How to replace text in a textfile

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I have a program that has more than one form and it creates the textboxes and labels on the second form.the textbox on this form is the "password" and i need to save it so when the second form loads it retrieves the password and makes it so they can change it if they wish

i tried to write it to the file like this

C#

private void buttonclick(object sender,EventArgs e)
{
                counter += 1;
                TextBox tb = new TextBox();
                Label labl = new Label();
                Label num = new Label();
                tb.Text = textbox.Text;
                labl.Text ="hello";
                num.Text = counter.ToString();
                string currentEntry = num.Text + "|" + tb.Text.Replace("|", "~") + "|" 
                                 + labl.Text + "|";
                File.AppendAllText("savedpass.txt", currentEntry);
                this.Hide();
}

I want to replace a tb.text with some unknown value entered by a user.
How do i do this ??

What I have tried:

i have tried

C#

using (StreamReader sr = new StreamReader("savedpass.txt"))
                {
                    string line = "";
                    while ((line = sr.ReadLine()) != null)
                    {
                        string[] lineData = line.Split('|');
                        string num = lineData[1];
                        ReplaceInFile("savedpass.txt",textbox.text,num);
                        
                    }
                    sr.Close();
                }

but it comes up with the error file is being used by another process

Posted 28-Jul-18 3:58am

Codingnow20

Updated 28-Jul-18 10:17am

Nelek

v5

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OriginalGriff · Accepted Answer · 2018-07-28T04:21:00

What are you trying to do?
You create a TextBox - which you never display - set its Text property from a different textbox, create two labels you never display, and then hide everything to be on the safe side...

Try this:

private void buttonclick(object sender,EventArgs e)
    {
    string currentEntry = string.Format("{0}|{1}|{2}", 
                                        ++counter, 
                                        textBox.Text.Replace("|", "~"), 
                                        "hello");
    File.AppendAllText("savedpass.txt", currentEntry);
    this.Hide();
    }

As for your "What I have tried" code, of course you get a "file in use" error - you are probably using the file! Either there is a mistype in the file names and you actually have "savedpass.txt" in both places, or your ReplaceInFile method is not releasing the file properly.

using (StreamReader sr = new StreamReader("savedpass.txt"))
    {
    string line = "";
    while ((line = sr.ReadLine()) != null)
        {
        string[] lineData = line.Split('|');
        string num = lineData[1];
        ReplaceInFile("savepass.txt",textbox.text,num);
        
        }
    sr.Close();
    }