C# Write Textfile into exe Folder

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C#

text

hi,

i have a sort of history in my programm wich, documents what the programm
is currently doing.

Now i want to create a textfile on first run, into the exe folder to write
this documentation every time into this file.

I am using a class for writing the documentation into a rich textbox.
the method of the class wich perform this documentation is looking like this:

public void Aktual(int number)
{
switch(number)
{
case 1:
string Text1 = "Hi im text1, this is currently doing";
break;

//And further
}
}

so my problems are:

- Creating a textfile into exe folder
SOLVED: (- Write in general into this existing file, to dont overwrite)
SOLVED: (- Open this existing textfile to view it)


Thank you

ps.: Let me know if you need more explanation

greets Niko