[Solved] Write text file and open at same time

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FileStream currentFileStream = null;//EDIT
string tempFilePath = Directory.GetCurrentDirectory() + "\\TEMP.txt";

if (!File.Exists(tempFilePath))
{
    currentFileStream = File.Create(tempFilePath);//creates temp text file
    currentFileStream.Close();//frees the file for editing/reading
}//if file does not already exist

File.WriteAllText(tempFilePath, textbox1.Text);//overwrites all text in temp file

//Inside your exit function:
if(File.Exists(tempFilePath)) File.Delete(tempFilePath);//delete temp file

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solved Write text file and open at same time