Smith works as a Software Developer for ABC Inc.

Smith works as a Software Developer for ABC Inc. He creates an application using Visual Studio .NET 2005. The application displays "Welcome to ABC" on the top-left corner of a form. He writes the following code:

StringBuilder strbuild1 = new StringBuilder(20);

strbuild1.Append("'Welcome");

strbuild1.Append(" ");

strbuild1.Append("to");

strbuild1.Append(" ");

strbuild1.Append("ABC'");

string str1 = strbuild1.ToString();

Console.WriteLine(str1);

Console.ReadLine();

What is the main purpose of using StringBuilder object in the application?