String Builder:
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StringBuilder is ideal for appending, removing, replacing, or inserting characters. This size of your string can be modified dynamically, no need to set a size during declaration.
Common usage of StringBuilder would be concatenating string values, replacing values in a string e.g Replacing all occurances of ' with ''
Here We can see More By following this link:
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http://msdn.microsoft.com/en-us/library/system.text.stringbuilder%28VS.71%29.aspx