Here I will explain the difference between string and stringbuilder in c#.
String is immutable object (i.e. once created cannot be changed ) and It always create new object of string type in memory. If we want to append or replace something in string then it will discard the old value and will create new instance in memory to hold the new value. String belongs to “System” namespace.
string str = "Hello Visitor";
// create a new string instance instead of changing the old one
str += "How Are";
str += "You ??";
StringBuilder is mutable, means if create string builder object then you can make modification in the data i.e. you can append and replace the string without creating new instance for every time.it will update string at one place in memory doesn’t create new space in memory. Stringbuilder belongs to “System.Text” namespace.
StringBuilder strbuilder = new StringBuilder("");
string str = sb.ToString();
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Difference between string and stringbuilder.