VB.Net Nested If 嵌套If语句
VB.Net 决策在VB.Net中总是合法的嵌套If-Then-Else语句，这意味着您可以在另一个If ElseIf语句中使用一个If或ElseIf语句。
语法：
If( boolean_expression 1)Then
'Executes when the boolean expression 1 is true
If(boolean_expression 2)Then
'Executes when the boolean expression 2 is true
End If
End If
示例：
Module decisions
Sub Main()
'local variable definition
Dim a As Integer = 100
Dim b As Integer = 200
' check the boolean condition
If (a = 100) Then
' if condition is true then check the following
If (b = 200) Then
' if condition is true then print the following
Console.WriteLine("Value of a is 100 and b is 200")
End If
End If
Console.WriteLine("Exact value of a is : {0}", a)
Console.WriteLine("Exact value of b is : {0}", b)
Console.ReadLine()
End Sub
End Module
当上述代码被编译和执行时，它产生以下结果：
Value of a is 100 and b is 200
Exact value of a is : 100
Exact value of b is : 200
