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Like i heard that string is immutable mean cannot be changed once created so i tried:

String name = "Hunain";
Console.Write("String_replaced="+  name.Replace('i', 'y') + "\n");

according to someone, string.Replace('','') throws a new object and doesn't modify existing string but it did like in above example, neither i stored it in another object nothing, why ? then what's the difference between string type and string builder ?

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