Send Key To Game (Help Plz)

I'm trying to make an auto-jump for CS:S. I have tried SendKey.Send("KEY HERE") but it didn't work. I read some other posts, even downloaded a DLL which did not work. (www . mpgh.net/forum/33-visual-basic-programming/191917-release-string-sender-dll.html)

What is a way I could simulate a key so it would automatically jump?

SendKey.Send("{mouse1}")

That's basically what I tried, it didn't work.

If you got an error I dont know, but in general that doesn't work with directx games...
BUT, if you wanna use this code you will have to make some kind of hook for the game.

fix error if you have :

Dim tex As String = "text"
My.Computer.Keyboard.SendKeys(tex)