I'm not sure if it's possible. I usually create txt files like this:
FileStream fs = new FileStream("c:\\textFile.txt", FileMode.Append, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs);
but instead of using "c:\textFile.txt" I want to create a file using a string name. Is there a way to do it?
Of course. The first argument to the FileStream constructor takes a string. You've just passed it a string literal (defined in your source code file). It sounds like you want to pass a string variable instead:
string path = // get string from somewhere. A file save dialog, maybe?
FileStream fs = new FileStream(path, FileMode.Append, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs);
May I suggest that you spend some time with a C# tutorial? Microsoft has some good tutorials and samples. With all due respect, and we were all there once, you've got some holes in your knowledge that will trip you up.
I'm not sure I'm following what you're asking for. You just asked if u could do that:
string filename = "c:\\textFile.txt";
FileStream fs = new FileStream(filename, FileMode.Append, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs);
or as you specified
FileStream fs = new FileStream(YourTextBox.Text, FileMode.Append, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs);
new FileStream(myVariable, FileMode.Append, FileAccess.Write);