SendKey command working with vbs but not C# -

i trying send ctrl+alt+left windows form button (c#) rotate screen. intel hotkey. when press button nothing happening, if use same command in vbs file works.

this c# code not work:

private void button1_click(object sender, eventargs e) {     sendkeys.send("^%{left}"); } 

vb script work:

set objshell = createobject("wscript.shell")  objshell.sendkeys "^%{left}" 

i'm new maybe i'm missing obvious?

maybe parenthesis issue:

sendkeys.send("^(%{left})"); 

you can find more details in documentation stated that:

to specify combination of shift, ctrl, , alt should held down while several other keys pressed, enclose code keys in parentheses. example, specify hold down shift while e , c pressed, use "+(ec)". specify hold down shift while e pressed, followed c without shift, use "+ec".

not sure behaviour of vbs: expect same behavior of c# because vbs documentation sendkeys so...