System.String and System.Text.StringBuilder classes in .net

Question

Hi Friends Difference between System.String and System.Text.StringBuilder classes?

Ajitender Vijay · Answer

Hi The String object is immutable. Every time you use one of the methods in the System.String class you create a new string object in memory which requires a new allocation of space for that new object. In situations where you need to perform repeated modifications to a string the overhead associated with creating a new String object can be costly. The System.Text.StringBuilder class can be used when you want to modify a string without creating a new object. For example using the StringBuilder class can boost performance when concatenating many strings together in a loop. You can create a new instance of the StringBuilder class by initializing your variable with one of the overloaded constructor methods as illustrated in the following example. StringBuilder MyStringBuilder = new StringBuilder( Hello World! ); Please refer this link http://msdn.microsoft.com/en-us/library/2839d5h5%28v=vs.71%29.aspx Thanks

Jignesh Trivedi · Answer

hi System.String is immutable. System.StringBuilder was designed with the purpose of having a mutable string where a variety of operations can be performed. The String object is immutable which meansevery time you use any of the methods in the String class you create a new string object in memory.The StringBuilder class can be used when you want to modify a string without creating a new object. String will allocate only what is needed. When we concatinate strings it sums up the length of all and creates buffer to fit that.Whereas string builder allocates capacity of 16 initially and increases capacity in the multiples of 2. Also refer http://pranayamr.blogspot.com/2011/02/why-to-user-stringbuilder-over-string.html hope this help.

Satyapriya Nayak · Answer

Hi Akshay Please refer the below link http://www.c-sharpcorner.com/uploadfile/jitendra1987/string-and-stringbuilder-classes/ Thanks

Vulpes · Answer

Strings are immutable - once you've created an instance of one you can't change it. Methods of the System.String class which appear to alter a string do in fact create a new instance. In contrast StringBuilder instances are mutable - you can change both their length and their contents. They are more efficient than strings for some operations such as concatenating a large number of strings together.