'C# streamwriter does not overwrite futher information [duplicate]

i'm working on a calculator project for my school.

i have a problem with overwriting my operations to a text document, normally i should have this on my text file:

1|peter|DESKTOP-P6IL7VV|19/11/2017 11:38:11  ==>  5 x 5=25       
2|peter|DESKTOP-P6IL7VV|19/11/2017 11:38:15  ==>  25 + 3=28      
3|peter|DESKTOP-P6IL7VV|19/11/2017 11:38:27  ==>  28 / 2=14      
4|peter|DESKTOP-P6IL7VV|19/11/2017 11:38:31  ==>  14 + 6=20      
5|peter|DESKTOP-P6IL7VV|19/11/2017 11:38:35  ==>  20 - 20=0                
(example from my teacher)

but every time i write something, it deletes the first line, and overwrites only the last operation, i need every time i click on the result button, it overwrites to my file with the order of numbers

here is my coding:

private void result_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            result();
        }
        catch (Exception exc)
        {
            txtIngave.Text = "Error!";
        }
        try
        {
            if (!txtResultaat.Text.Equals(string.Empty) && btnLog.IsChecked 
            == true)
            {
                int i = 1;
                using (StreamWriter myOper = new 
     StreamWriter(@"C:\Users\Ach\Documents\Visual Studio 
      2017\Projects\TaakCalculator\log\log.txt"))
                {
                   myOper.WriteLine(i.ToString() + " | " + "Achraf | " + System.Environment.MachineName + " | " + DateTime.Now.ToLongTimeString() + " | ==> " + txtResultaat.Text);
                }
                i++;

            }
        }
        catch (Exception ex)
        {

            MessageBox.Show("Loser");
        }
    }
c++sharpstreamwriter


Solution 1:[1]

Try the 

StreamWriter(string path, bool append)

constructor with the parameter append being true.

From the documentation:

append

true to append data to the file; false to overwrite the file. If the specified file does not exist, this parameter has no effect, and the constructor creates a new file.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Paul Kertscher

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