How to comment multiple lines of code/block of code in VB?
12 Answers
VB doesn't have such a construct at the language level. It has single line comments using apostrophe character:
' hello world
' this is a comment
Rem this is also a comment
However, Visual Studio has a functionality to automate this task. Select the lines you want and press Ctrl+K+C for commenting and Ctrl+K+U for uncommenting (General Development Settings shortcuts, look at the "Edit -> Advanced" menu while selecting some code to see the shortcuts).
The other answers explain how to comment/uncomment automatically in VB.NET. Just for completeness, in VB6 use these toolbar buttons: 
. More details here.
Select the lines you need to comment and press keys CTRL+K+C.
If you need to uncomment use CTRL+K+U
In the vb++ you can comment the blocks of the comment with:
CommentStart==>Type your comment and on many of the lines<==CommentEnd+/inc.
in VS2010 VB.NET, type 3 times ' above a class/function/property/declaration
then it will auto generate a comment block :
''' <summary>
''' GRP Business partner ID
''' </summary>
''' <value></value>
''' <returns></returns>
''' <remarks></remarks>
same thing in C# but type 3 times /
/// <summary>
///
/// </summary>
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