how to make some entry on opened text file?

If you want the text to appear after you've opened the file, then I'd check out the SendKeys class:

http://msdn2.microsoft.com/en-us/library/system.windows.forms.sendkeys.aspx

The application here is, of course, your default text editor (probably notepad.exe) rather than the textfile itself.

You'll need to force the focus onto the text editor window first and the easiest way to do that is by calling the Win32 API function FindWindow. This link shows how to use this from both VB.Net and C#:

http://pinvoke.net/default.aspx/user32/FindWindow.html

To use the DllImport attribute, you'll need this line at the top of your program:

Imports System.Runtime.InteropServices

Of course, if you want to write the text to the file before you open it, you can simply use a StreamWriter to do this, close the file and then reopen using the Process.Start method.

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Alan19y ago
If you want the text to appear after you've opened the file, then I'd check out the SendKeys class:

http://msdn2.microsoft.com/en-us/library/system.windows.forms.sendkeys.aspx

The application here is, of course, your default text editor (probably notepad.exe) rather than the textfile itself.

You'll need to force the focus onto the text editor window first and the easiest way to do that is by calling the Win32 API function FindWindow. This link shows how to use this from both VB.Net and C#:

http://pinvoke.net/default.aspx/user32/FindWindow.html

To use the DllImport attribute, you'll need this line at the top of your program:

Imports System.Runtime.InteropServices

Of course, if you want to write the text to the file before you open it, you can simply use a StreamWriter to do this, close the file and then reopen using the Process.Start method.