Understanding VB.NET Code

1. Option Explicit: Used at file level to force explicit declaration of all variables in that file.

When Option Explicit appears in a file, you must explicitly declare all variables using the Dim, Private, Public, or ReDim statements. If you attempt to use an undeclared variable name, an error occurs at compile time.

If you don’t use the Option Explicit statement, all undeclared variables are of Object type.

VBA: Option Explicit

VB.NET: Option Explicit On

Reference: http://msdn.microsoft.com/en-us/library/y9341s4f(v=vs.71).aspx

2. Declare Statement: Used at module level to declare references to external procedures in a dynamic-link library (DLL).

[Public | Private] Declare Function name Lib “libname” [Alias “aliasname”] [([arglist])] [As type]

Reference: http://msdn.microsoft.com/en-us/library/aa243324(v=vs.60).aspx

VBA: ByVal field As Any

VB.Net: ByVal field As Object

Reference: http://social.msdn.microsoft.com/Forums/en/vbinterop/thread/2c87df7c-48ad-4ab8-a6b8-e0e277eb74ec

3. Radio Buttons (or Option Buttons)

VBA: RadioButton.Value

VB.NET: RadioButton.Checked

When grouped under a GroupBox, users will only be able to select one radio button.

4. Common Dialogue


VBA:  .. +  “Microstation files (*.dgn)|*.DGN|”

VB.NET:   .. + “Microstation files (*.dgn)|*.DGN”

Note that vb.net does not allow a vertical bar at the end of the very last one of the Filter Options

5. Left and Right Function

In VB.NET, add:

Imports VBStrings = Microsoft.VisualBasic.Strings

and use



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