I have long single line string literals containing " characters in code like

switch (expr) {
case @"IR(""xxx"")+sql('sele tasudok from dok x where doktyyp+str(dokumnr,7)= ""G""+str(dok.krdokumnr,7) ','')":

For code readability I need to split them to multiple lines so that vlaue remains same. I tried

switch (expr) {
case "IR(\"xxx\")+\
sql('sele tasudok from dok x \
where doktyyp+str(dokumnr,7)= \"G\"+\
str(dok.krdokumnr,7) ','')":

But got compile error. Any idea ?