Hmmm... He's talking about the types of Messagebox in VB.NET or VB.
Probably many doesn't understand what the code does...
Let me explain them with screenshots..
Normal Message BoxesCODE
Windows.Forms.MessageBox.Show("This is a plain messagebox.")
Is shown as

CODE
Windows.Forms.MessageBox.Show("This is a plain messagebox." & vbCrLf & "It's got a caption too.", "This is the caption.")
Is shown as

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Message Boxes with Different Button TypesCODE
Windows.Forms.MessageBox.Show("It's got Abort, Retry, Cancel buttons.", "", MessageBoxButtons.AbortRetryIgnore)
Is shown as

CODE
Windows.Forms.MessageBox.Show("It's got OK button.", "", MessageBoxButtons.OK)
Is shown as

CODE
Windows.Forms.MessageBox.Show("It's got OK, Cancel buttons.", "", MessageBoxButtons.OKCancel)
Is shown as

CODE
Windows.Forms.MessageBox.Show("It's got Retry, Cancel buttons.", "", MessageBoxButtons.RetryCancel)
Is shown as

CODE
Windows.Forms.MessageBox.Show("It's got Yes, No buttons.", "", MessageBoxButtons.YesNo)
Is shown as

CODE
Windows.Forms.MessageBox.Show("It's got Yes, No, Cancel buttons.", "", MessageBoxButtons.YesNoCancel)
Is shown as

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Message Boxes with Different Alert TypesCODE
Windows.Forms.MessageBox.Show("An Asterisk type icon.", "", MessageBoxButtons.OK, MessageBoxIcon.Asterisk)
Is shown as

CODE
Windows.Forms.MessageBox.Show("An Error type icon.", "", MessageBoxButtons.OK, MessageBoxIcon.Error)
Is shown as

CODE
Windows.Forms.MessageBox.Show("An Exclamation type icon.", "", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
Is shown as

CODE
Windows.Forms.MessageBox.Show("A Hand type icon.", "", MessageBoxButtons.OK, MessageBoxIcon.Hand)
Is shown as

CODE
Windows.Forms.MessageBox.Show("An Information type icon.", "", MessageBoxButtons.OK, MessageBoxIcon.Information)
Is shown as

CODE
Windows.Forms.MessageBox.Show("A None type icon.", "", MessageBoxButtons.OK, MessageBoxIcon.None)
Is shown as

CODE
Windows.Forms.MessageBox.Show("A Question type icon.", "", MessageBoxButtons.OK, MessageBoxIcon.Question)
Is shown as

CODE
Windows.Forms.MessageBox.Show("A Stop type icon.", "", MessageBoxButtons.OK, MessageBoxIcon.Stop)
Is shown as

CODE
Windows.Forms.MessageBox.Show("A Warning type icon.", "", MessageBoxButtons.OK, MessageBoxIcon.Warning)
Is shown as

I've created an example on VB.NET 2003.
You can download the program here to view all the types of Messageboxes.
Download: http://www.freeuploader.com/view.php/69424.zipSource Codes: http://www.freeuploader.com/view.php/69426.zip
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