Logical Operators in VB.NET

How to use the logical operators in VB.NET?


Logical Operators

Logical Operators are used to compare Boolean expressions to return the result as a Boolean value.
Following table lists the Logical Operators used in Visual Basic.net 2008.
Operator Description
And Both Conditions must be true
or Either one condition is true
Xor One condition can be true, but not both
Not None should be true

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Button1.Click
If ((Val(TextBox1.Text) > 10) And (Val(TextBox1.Text) < 20))
MsgBox("Date is in the Middle of the Month")
ElseIf ((Val(TextBox1.Text) < 1) Or (Val(TextBox1.Text) > 31))
MsgBox("Enter a Valid Date")
MsgBox("Date entered is either is in Start or End of Month")
End If
End Sub
End Class

In the above example we have used And operator to check the value entered in the TextBox1 is from middle of the month. Or operator is used to find the invalid entry.

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