Methods of the String Class in c#.net

           The String class has numerous methods that help you in working with the string objects. The following table provides some of the most commonly used methods:

S.N	Method Name & Description
1	public static int Compare( string strA, string strB )  Compares two specified string objects and returns an integer that indicates their relative position in the sort order.
2	public static int Compare( string strA, string strB, bool ignoreCase )  Compares two specified string objects and returns an integer that indicates their relative position in the sort order. However, it ignores case if the Boolean parameter is true.
3	public static string Concat( string str0, string str1 )  Concatenates two string objects.
4	public static string Concat( string str0, string str1, string str2 )  Concatenates three string objects.
5	public static string Concat( string str0, string str1, string str2, string str3 )  Concatenates four string objects.
6	public bool Contains( string value )  Returns a value indicating whether the specified string object occurs within this string.
7	public static string Copy( string str )  Creates a new String object with the same value as the specified string.
8	public void CopyTo( int sourceIndex, char[] destination, int destinationIndex, int count )  Copies a specified number of characters from a specified position of the string object to a specified position in an array of Unicode characters.
9	public bool EndsWith( string value )  Determines whether the end of the string object matches the specified string.
10	public bool Equals( string value )  Determines whether the current string object and the specified string object have the same value.
11	public static bool Equals( string a, string b )  Determines whether two specified string objects have the same value.
12	public static string Format( string format, Object arg0 )  Replaces one or more format items in a specified string with the string representation of a specified object.
13	public int IndexOf( char value )  Returns the zero-based index of the first occurrence of the specified Unicode character in the current string.
14	public int IndexOf( string value )  Returns the zero-based index of the first occurrence of the specified string in this instance.
15	public int IndexOf( char value, int startIndex )  Returns the zero-based index of the first occurrence of the specified Unicode character in this string, starting search at the specified character position.
16	public int IndexOf( string value, int startIndex )  Returns the zero-based index of the first occurrence of the specified string in this instance, starting search at the specified character position.
17	public int IndexOfAny( char[] anyOf )  Returns the zero-based index of the first occurrence in this instance of any character in a specified array of Unicode characters.
18	public int IndexOfAny( char[] anyOf, int startIndex )  Returns the zero-based index of the first occurrence in this instance of any character in a specified array of Unicode characters, starting search at the specified character position.
19	public string Insert( int startIndex, string value )  Returns a new string in which a specified string is inserted at a specified index position in the current string object.
20	public static bool IsNullOrEmpty( string value )  Indicates whether the specified string is null or an Empty string.
21	public static string Join( string separator, params string[] value )  Concatenates all the elements of a string array, using the specified separator between each element.
22	public static string Join( string separator, string[] value, int startIndex, int count )  Concatenates the specified elements of a string array, using the specified separator between each element.
23	public int LastIndexOf( char value )  Returns the zero-based index position of the last occurrence of the specified Unicode character within the current string object.
24	public int LastIndexOf( string value )  Returns the zero-based index position of the last occurrence of a specified string within the current string object.
25	public string Remove( int startIndex )  Removes all the characters in the current instance, beginning at a specified position and continuing through the last position, and returns the string.
26	public string Remove( int startIndex, int count )  Removes the specified number of characters in the current string beginning at a specified position and returns the string.
27	public string Replace( char oldChar, char newChar )  Replaces all occurrences of a specified Unicode character in the current string object with the specified Unicode character and returns the new string.
28	public string Replace( string oldValue, string newValue )  Replaces all occurrences of a specified string in the current string object with the specified string and returns the new string.
29	public string[] Split( params char[] separator )  Returns a string array that contains the substrings in the current string object, delimited by elements of a specified Unicode character array.
30	public string[] Split( char[] separator, int count )  Returns a string array that contains the substrings in the current string object, delimited by elements of a specified Unicode character array. The int parameter specifies the maximum number of substrings to return.
31	public bool StartsWith( string value )  Determines whether the beginning of this string instance matches the specified string.
32	public char[] ToCharArray() Returns a Unicode character array with all the characters in the current string object.
33	public char[] ToCharArray( int startIndex, int length )  Returns a Unicode character array with all the characters in the current string object, starting from the specified index and up to the specified length.
34	public string ToLower() Returns a copy of this string converted to lowercase.
35	public string ToUpper() Returns a copy of this string converted to uppercase.
36	public string Trim() Removes all leading and trailing white-space characters from the current String object.

                 The above list of methods is not exhaustive, please visit MSDN library for the complete list of methods and String class constructors.