Visual Basic .NET Comments
Tags: VB.NET, VB 2008, VB 2010, VB 2012, VB 2013
This lesson explains the comments in Visual Basic .NET
The comments are one of the few typographic code elements that make a programs structure a bit easier to understand.
They do not execute and they are ignored by the compiler but are an important part of how you organize your code.
Generally speaking, comments can help you as well as other developers (at a later date) to understand the code purpose.
The comment starts with a single quotation mark (') and everything until the end of the line is part of the comment and as mentioned ignored by Visual Basic.
NOTE: you cannot use line continuation characters to make a multi-line comment nor you can have block comment as they are not supported in VB.NET
If you want to comment or uncomment a large block of code quickly, just select the code and then open Edit > Advanced > Comment Selection and Uncoment Slection respectively.
You should always use comments to make your code clear and understandable.
' checking if the username and password are valid If Username.Text = "admin" AndAlso Password.Text = "mypwd" Then Dim mForm As Form = MainForm ' instantiate the MainForm mForm.ShowDialog() ' display the main form Me.Close() ' close the login form Else ' incorrect username or password provided Username.Text = String.Empty ' reset the username textbox Password.Text = String.Empty ' reset the password textbox ' let them know that username or password is incorrect MessageBox.Show("Incorrect username or password. Please try again!") End If