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Version 40 of the NET Framework adds two more forms of Concat( ), which are shown here: public static string Concat<T>(IEnumerable<T> values) public static string Concat(IEnumerable<string> values) The first form returns a string that contains the concatenation of the string representation of the values in values, which can be any type of object that implements IEnumerable<T> The second form concatenates the strings specified by values (Understand, however, that if you are doing a large amount of string concatenations, then using a StringBuilder may be a better choice)

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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 It is important to keep in mind that a search can be either culture-sensitive or ordinal To find the first occurrence of a string or a character, use the IndexOf( ) method It defines several overloaded forms Here is one that searches for the first occurrence of a character within a string: public int IndexOf(char value) This method returns the index of the first occurrence of the character value within the invoking string It returns 1 if value is not found The search to find the character ignores cultural settings Thus, to find the first occurrence of a character, an ordinal search is used Here are two of forms of IndexOf( ) that let you search for the first occurrence of a string: public int IndexOf(String value) public int IndexOf(String value, StringComparison comparisonType) The first form uses a culture-sensitive search to find the first occurrence of the string referred to by value The second form lets you specify a StringComparison value that specifies how the search is conducted Both return 1 if the item is not found To search for the last occurrence of a character or a string, use the LastIndexOf( ) method It also defines several overloaded forms This one searches for the last occurrence of a character within the invoking string: public int LastIndexOf(char value) This method uses an ordinal search and returns the index of the last occurrence of the character value within the invoking string or 1 if value is not found Here are two forms of LastIndexOf( ) that let you search for the last occurrence of a string: public int LastIndexOf(string value) public int LastIndexOf(string value, StringComparison comparisonType) The first form uses a culture-sensitive search to find the first occurrence of the string referred to by value The second form lets you specify a StringComparison value that specifies how the search is conducted Both return 1 if the item is not found.

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String offers two interesting supplemental search methods: IndexOfAny( ) and LastIndexOfAny( ) These search for the first or last character that matches any of a set of characters Here are their simplest forms: public int IndexOfAny(char[ ] anyOf) public int LastIndexOfAny(char[ ] anyOf) IndexOfAny( ) returns the index of the first occurrence of any character in anyOf that is found within the invoking string LastIndexOfAny( ) returns the index of the last occurrence of any character in anyOf that is found within the invoking string Both return 1 if no match is found In both cases, an ordinal search is used When working with strings, it is often useful to know if a string begins with or ends with a given substring To accomplish this task, use the StartsWith( ) and EndsWith( ) methods Here are their two simplest forms: public bool StartsWith(string value) public bool EndsWith(string value) StartsWith( ) returns true if the invoking string begins with the string passed in value EndsWith( ) returns true if the invoking string ends with the string passed in value Both return false on failure These use culture-sensitive searches To specify how the searches are conducted, you can use a version of these methods that has a StringComparison parameter Here are examples: public bool StartsWith(string value, StringComparison comparisonType) public bool EndsWith(string value, StringComparison comparisonType) They work like the previous versions, but let you explicitly specify how the search is conducted Here is a program that demonstrates several of the string search methods For purposes of illustration, all use ordinal searching: