Conditional statements allow to control the flow of execution of a script or one of its sections. So you use some keywords and associate expressions with them. Depending on the outcome of the comparison operations and other checking process, you can take appropriate actions.

Most of the conditional statements perform comparisons and work on the basis of outcome. To assist you in making such comparisons, the VBScript language is equipped with special operators that can act on natural numbers, decimal numbers, or strings.

• Equality =
• Inequality <>
• Less Then  <

You can control the flow of your script with looping statements and conditional statements.Using conditional statements, you can write VBScript code that makes decisions and repeats actions. The following conditional statements are available in VBScript:

• If...Then...Else statement
• Select Case statement

The If...Then...Else statement is used to evaluate whether a condition is True or False and depending on the result it executes one or more statements. Usually the condition is an expression that uses a comparison operator to compare one value or variable with another value or variable.If...Then...Else statements can be nested up to many levels.

To run only one statement when a condition is True, use the single-line syntax for the If...Then...Else statement. The example given below shows the single-line syntax. Notice that this example neglect the Else keyword.

To run more than one line of code, you must use the multiple-line syntax. This syntax end with the End If statement, as shown in the following example:

You can use an If...Then...Else statement to define two blocks of executable statements: one block to run if the condition is True, the other block to run if the condition is False.

To choose from several alternatives, If...Then...Else statement used. Adding ElseIf clauses expands the functionality of the If...Then...Else statement so you can control program flow based on different possibilities. See following example:

To provide alternative choices you add as many ElseIf clauses as you need. Extensive use of the ElseIf clauses often becomes bulky. A better way to choose between several alternatives is the Select Case statement.

A variation on the If...Then...Else statement allows you to choose from several alternatives. Adding ElseIf clauses expands the functionality of the If...Then...Else statement so you can control program flow based on different possibilities. For example:

With a single test expression a Select Case structure works that is evaluated once.At the top of the structure the result of the expression is compared with the values for each Case in the structure. If there is a match, the block of statements associated with that Case is executed:

Notice that the Select Case structure evaluates an expression once at the top of the structure. In contrast, the If...Then...ElseIf structure can evaluate a different expression for each ElseIf statement. You can replace an If...Then...ElseIf structure with a Select Case structure only if each ElseIf statement evaluates the same expression.