How do you pass variables from c# to javascript?

Looking to pass variables from c# to javascript to use some jquery code. Passing doubles, ints, strings, arrays. Does anyone know how to do this?

for example if I have this code snip in c#:

string blah = "this is a blah string";

I would like to pass this into javascript so that I could use a mouseover event in jquery:

$('#myDiv').mouseover(function(){ //do something with my 'blah' string });