Visual Basic .NET (Easy way to test Form) - visual-studio

Question

I have been using Java for most of my programming projects, but I got Visual Studio yesterday and want to start learning how to use Visual Basic.
I normally in Java, and can just copy and paste code into the class and rename the class name and it will work.
However, in Visual Basic this doesn't seem to be as simple as just a copy and paste and rename. All of Visual Basic .NET code is in a solution and from what I can tell there is only a main method in one form. In Java you can have a main class in each class and run the class simple like that.
I thought that you could do it the same way in Visual Basic .NET but so far have not been able to find the way to do it. I have tried making a form and then pasting in the example code into the load form and that seemed to generate no errors but didn't work neither.
Public Class GridsAndData
Private Sub GridsAndData_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)
Dim formGraphics As System.Drawing.Graphics
formGraphics = Me.CreateGraphics()
formGraphics.DrawLine(myPen, 200, 400, 200, 200)
myPen.Dispose()
formGraphics.Dispose()
End Sub
End Class
This was some sample code that I tried to draw a single line on a form.

Answer 1

You're not supposed to draw anywhere except in the Paint handler in Windows. Here's an example that works with the code you posted (placed in the correct method):
Start a new WinForms solution (File->New Project from the main menu).
Once the project is created, click on the Properties window (by default in the lower-right corner of Visual Studio). Click on the Events button (the little lightning bolt) to switch to that tab. Find the Paint item (in the Appearance section), and double-click it.
Paste your code into the generated method (which, by default, is Form1_Paint):
Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles MyBase.Paint
' Paste your code here - the part below "Private Sub" and above "End Sub"
Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)
Dim formGraphics As System.Drawing.Graphics
formGraphics = Me.CreateGraphics()
formGraphics.DrawLine(myPen, 200, 400, 200, 200)
myPen.Dispose()
formGraphics.Dispose()
End Sub