How to change 1 char in the string?

Question

I have this code:

string str = \"valta is the best place in the World\";

I need to replace the first symbol. When I try this:

Answer 1

Strings are immutable. You can use the string builder class to help!:

string str = "valta is the best place in the World";

StringBuilder strB = new StringBuilder(str);

strB[0] = 'M';