I have textbox showing the path which read from txt file
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Inside Txtfile look like this :

TextBox1.Text = C:\Hello\
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And the textbox will show the path C:\Hello\
Whatever i changed in txtfile the textbox will show the path from txtfile

But now i want to edit from textbox , and the textfile also change.

How can i do that?!
Pls Help. Thanks

>But now i want to edit from textbox , and the textfile also change.

Not sure what do you want. You can use System.IO.File class methods to read/write text.