How to implement one's complement operator (~) on a string variable in c#?

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C#

Hi friends!

I'm new here and to C# language. I know how to read text from files and write to them using stream reader and writer classes. But now, what I need is that I must write into text files with the text one's complemented.

I've created a windows form application with a textbox(multiline) and a button to submit the text in the textbox. In the onclick event of the button, I've written code to open the file("sample.txt") with write permissions and the text directly goes into the file and is saved and closed on clicking the "done" button.

This is fine and I want to write the text into the file in encrypted format. In c language, I've used the " ~ " operator on a variable to get it's one's complemented form. In c# i don't know how to do this. I just want to perform the one's complement operation on the string to be written to a file. How can I do this??

Thanks in advance..