Terry's WebLog

Case sensitive

Not case sensitive:

response.write("Yo") ' OK

Case sensitive:

response.write("Yo"); // Error Response.Write("Yo"); // OK

Functional blocks

Use beginning and ending statements to declare functional blocks of code:

Sub Show(strX as String)   Response.Write(strX) End Sub

Use braces to declare functional blocks of code:

void Show (string strX)

{

Response.Write(strX);

}

Type conversion

Implicit type conversions are permitted by default:

Dim intX As Integer

intX = 3.14  ' Permitted

You can limit conversions by including an Option Strict On statement at the beginning of modules.

Type conversions are performed explicitly by casts:

int intX;

intX = 3.14; // Error!

intX = (int)3.14; //Cast, OK.

Or, use type conversion methods:

string strX; strX = intX.ToString();

Arrays

Array elements are specified using parentheses:

arrFruit(1) = "Apple"

Array elements are specified using square brackets:

arrFruit[1] = "Apple";

Methods

You can omit parentheses after method names if arguments are omitted:

strX = objX.ToString

You must include parentheses after all methods:

strX = objX.ToString();

Statement termination

Statements are terminated by carriage return:

Response.Write("Hello")

Statements are terminated by the semicolon (;):

Response.Write("Hello");

Statement continuation

Statements are continued using the underscore (_):

intX = System.Math.Pi * _   intRadius

Statements continue until the semicolon (;) and can span multiple lines if needed:

intX = System.Math.PI *    intRadius;

String operator

Use the ampersand (&) or plus sign (+) to join strings:

strFruit = "Apples" & _   " Oranges"

Use the plus sign (+) to join strings:

strFruit = "Apples" +    " Oranges";

Comparison operators

Use =, >, <, >=, <=, <> to compare values:

If intX >= 5 Then

Use ==, >, <, >=, <=, != to compare values:

if (intX >= 5)

Negation

Use the Not keyword to express logical negation:

If Not IsPostBack Then

Use the ! operator to express logical negation:

if (!IsPostBack)

Object comparison

Use the Is keyword to compare object variables:

If objX Is objY Then

Use == to compare object variables:

if (objX == objY)

Object existence

Use the Nothing keyword or the IsNothing function to check if an object exists:

If IsNothing(objX) Then

Use the null keyword to check if an object exists:

if (objX == null)