Hi sheeniwas,
Try this, it might help you.
string str = "Work In Progress(10)";
int pos1 = str.IndexOf("(");
int pos2 = str.IndexOf(")");
int lenth = pos2 - pos1;
string newstr = str.Substring(pos1+1, lenth-1);
newstr will give you 10 in this case
If it is helpfull please mark it as answer.
Regards
SUNIL