sreing problem

Question

hi my microcontroller board sends with serial port to my pc the strings      pool1#1251 , pool2#1252, pool3#1253, pool4#1254

 

i wand in pc C# software to read

RxString = serialPort1.ReadLine();

i have done this but i wand :

if the string starts with pool1 then to add in intiger int=p1 the 1251 number

if the string starts with pool2 then to add in intiger int=p2 the 1252 number

if the string starts with pool3 then to add in intiger int=p3 the 1253 number

if the string starts with pool4 then to add in intiger int=p4 the 1254 number