check inside a text file for existing text ?

[Neo7]

I have a text file that contains some text.

I tried this code to write something into it :

TextFile.WriteFromString("C:\\1.txt", "\r\nThis is some text.", true);

But I want it before writing, check the text file if (This is some text.) is already exists.

Is that possible ?

[Mick]

text file read to string then string find.

[Neo7]

Tnx, it was easy