C# 0 The Complete Reference

Int32.ToString( )

 is invoked to obtain the string representation of the integer value 19. 

Concat( )

 then concatenates the strings and returns the result.

Also notice how an object of the user-defined class 

MyClass

 can be used in this call to 

Concat( )

:

result = String.Concat(mc, " current count is ",

                       MyClass.Count);

In this case, the string representation of 

mc

, which is of type 

MyClass

, is returned. By default, 

this is simply its class name. However, if you override the 

ToString( )

 method, then 

MyClass

can return a different string. For example, try adding this version of 

ToString( )

 to 

MyClass

in the preceding program:

public override string ToString() {

  return "An object of type MyClass";

}

When this version is used, the last line in the output will be

result: An object of type MyClass current count is 1

Searching a String

String

 offers many methods that allow you to search a string. For example, you can search 

for either a substring or a character. You can also search for the first or last occurrence of 

either.

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