diff between me.control and _control ??

[texas]

what is the difference between using me.controlname and _controlname?

[eyeRmonkey]

Nothing at all. Just like there is no difference between these two statements:

Dim MyPoint1 As System.Drawing.Point
Dim MyPoint2 As Point ' Assuming you have System.Drawing imported

The fully qualified name is usually better because it makes things easier to read and understand. It is good coding practice to include it.

[jmcilhinney]

The underscore is used to indicate that a variable is a class member as opposed to a local variable. Personally, I generally don't use it for the same reasons that I don't use Hungarian notation. It just isn't needed in the modern IDE. The one time I do use it is if I am exposing a variable through a property. It allows you to give the variable and property basically the same name, e.g.:

Private _someVar As String
 
Public Property SomeVar() As String
    Get
        Return Me._someVar
    End Get
    Set
        Me._someVar = Value
    End Set
End Property

Using Me also identifies a variable as being a member but that's not why I use it. I use it to get Intellisense. In the example above, if I didn't use Me I would have had to type "_someVar". Because I used Me I would only have to type "me._" and Intellsense would show me the variable. The Intellisense in C# 2005 is smart enough to give you help from the first letter you type, making use of "this" unnecessary, but all other versions (VB and C#) don't.

[techgnome]

Ctrl-Space invokes Intellisense immediately. If you've typed some chars already, it uses what's typed as a starting point.... if you haven't, then you get the intellisense with everything in it.

-tg

[jmcilhinney]

Ctrl-Space invokes Intellisense immediately. If you've typed some chars already, it uses what's typed as a starting point.... if you haven't, then you get the intellisense with everything in it.

-tg

Now that I didn't know. You is da gnome dat knows.

[techgnome]

Not only that but it works in VB6 VS2002/2003/2005 .... and probably earlier versions of VS too.

-tg

[zahadumy]

Isn't is easier to type "me." and then select the variable name you are looking for that type it's name? I always use me.variableName, although the code looks annoying sometimes because of this...

[eyeRmonkey]

Now that I didn't know. You is da gnome dat knows.

I thought I might mention that Ctrl+J will give you a list of all possible variables/properties/methods/etc no matter where your cursor is in the code. Ctrl+Space does the same thing, except it also attempts to make a prediction based on what you already have typed in, and will fill it in for you if it finds only one possible match.

Also, Ctrl+I will give you infromation about the current variable. Such as wether its data type.

[techgnome]

Now that I didn't know. You is da mon-kay dat knows.

-tg

[eyeRmonkey]

Now that I didn't know. You is da mon-kay dat knows.

-tg

Seems to me that it might be beneficial for me to make a list of keyboard shortcuts. But, unlike my VB6 to .NET equivalent chart, the shortcuts are probably possible to find online.

[penagate]

W.R.T. the first post, Me.controlname and _controlname are two different variables so there's a lot of difference in fact

As John said, the underscore prefix is just a notation, used to indicate a private member variable.

You don't want to get too carried away with underscores as in many contexts anything more than a single underscore prefix denotes an indentifier as being reserved for the compiler.