VISUAL BASIC .NET CONCEPTS

Strings

The String data type represents a series of characters (each representing in turn an instance of the Char data type). An instance ofa string can be assigned to a literal value that represents a series of characters. For example:

Dim MyString As String

MyString = "This is an example of the String data type"

A String variable can also accept any expression that evaluates to a string. Examples are shown below:

Dim OneString As String

Dim TwoString As String

TwoString = OneString.Substring(5,3) ' Evaluates to "two".

OneString = "1"

TwoString = OneString & "1" ' Evalates to "11".

A string can be thought of as a series of Char instances, and the String type has built-in functions that allow you perform manymanipulations on a string that resemble the manipulations allowed by arrays. You may refer to a specific character in a stringthrough the Chars property, which provides a way to access a character by the position in which it appears in the string. For Example:

Dim myString As String = "ABCDE"

Dim myChar As Char

myChar = myString.Chars(3) ' The value of myChar is "C"

More Samples

INDEXOF

Dim myString As String = "ABCDE"

Dim myInteger As Integer

myInteger = myString.IndexOf("D") ' myInteger = 3

CONCAT

Dim aString As String = "A"

Dim bString As String = "B"

Dim cString As String = "C"

Dim dString As String = "D"

Dim myString As String

' myString = "ABCD"

myString = String.Concat(aString, bString, cString, dString)

LCASE UCASE TOUPPER TOLOWER

Dim myString As String = "UpPeR oR LoWeR cAsE"

Dim newString As String

' newString = "UPPER OR LOWER CASE"

newString = UCase(myString)

' newString = "upper or lower case"

newString = LCase(myString)

' newString = "UPPER OR LOWER CASE"

newString = myString.ToUpper

' newString = "upper or lower case"

newString = myString.ToLower

TRIM

Dim myString As String = "#####Remove those!######"

Dim oneString As String

OneString = myString.Trim("#")

REMOVE REPLACE

Dim aString As String = "This is My Str@o@o@ing"

Dim myString As String

Dim anotherString As String

' myString = "This is My String"

myString = aString.Remove(14, 5)

' anotherString = "This is Another String"

anotherString = myString.Replace("My", "Another")

Visual Basic .Net

INSERT

Dim aString As String = "This is My Stng"

' Results in a value of "This is My String".

myString = aString.Insert(13, "ri")

JOIN

Dim shoppingItem(2) As String

shoppingItem(0) = "Milk"

shoppingItem(1) = "Eggs"

shoppingItem(2) = "Bread"

shoppingList = String.Join(",", shoppingItem)

SPLIT

Dim shoppingList As String = "Milk,Eggs,Bread"

Dim shoppingItem(2) As Stringshopping

Item = shoppingList.Split(","c)

SUBSTRING

Dim aString As String = "Left Center Right"

Dim subString As String

' subString = "Center"

subString = aString.SubString(5,6)