C# using LoadFile or ReadallLines on RichTextBox -

i have problem on few systems when trying load richtextbox program becomes unresponsive, cannot , have kill via taskmanager. working on systems few systems located in different country there seems problem.

we have tried simple :

private void testing4() {     richtextbox1.loadfile(@"c:\testing.logs", richtextboxstreamtype.plaintext); } 

if decide use normal textbox appears working using .net 4.5, still becomes unresponsive. ideas?

this may you:

foreach(var line in file.readlines(@"c:\testing.logs")) {   richtextbox1.appendtext(line+environment.newline); }