These characters show fine when I cut-and-paste them here from the VisualStudio debugger, but both in the debugger, and in the TextBox where I am trying to display this text
I was facing similar problem.
It was problem with reading file properly and not with TextBox
control.
StreamReader reader = new StreamReader(inputFilePath, Encoding.Default, true)
Copied from THIS.
Works for me and that too without switching to RichTextBox
.
You need to install and use a font which supports those characters. Not all fonts support all characters. the [] box character is the fonts representation of 'unsupported'
The textbox might be using MS Sans Serif by default, so change it to Arial or something else.
I changed from using a TextBox to using a RichTextBox, and now the characters display in the RichTextBox.