VB.Net Argument not Specified for Parameter Error

I am trying to work with two radio buttons in a simple VB.net app that allows a user to select and open a PDF using the Process object. One PDF will be assigned to each radio button. The code is shown below. I get the following error: "Argument not specified for parameter ‘AFileName’ of ‘Public Sub OpenFile(AFileName As String)."

Please help resolve the error.

This is not homework for a class. It is self-study using books.

Code:
Public Class Commands
    Public Sub OpenFile(ByVal AFileName As String)
        Dim psi As New ProcessStartInfo()
        psi.UseShellExecute = True
        psi.FileName = AFileName
        Process.Start(psi)
    End Sub
End Class

Open in new window


Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim fileName As String
        Dim Commands As New Commands
        If RadioButton1.Checked = True Then
            fileName = "c:\test_3\johnson.pdf"
        End If
        If RadioButton2.Checked = True Then
            '        Else
            fileName = "c:\test_3\ross.pdf"
        End If
        MessageBox.Show("File name is: " + fileName)
        Commands.OpenFile()
    End Sub
End Class

Open in new window

The following code causes the error:
Commands.OpenFile()

Open in new window

Mark01Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
try use this instead:

Commands.OpenFile(fileName)

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
AndyAinscowFreelance programmer / ConsultantCommented:
Ryan has pointed out your problem and its solution.

Just an aside instead of this:
        If RadioButton1.Checked = True Then
            fileName = "c:\test_3\johnson.pdf"
        End If
        If RadioButton2.Checked = True Then
            '        Else
            fileName = "c:\test_3\ross.pdf"
        End If

You ought to use a construct like this
        If RadioButton1.Checked = True Then
            fileName = "c:\test_3\johnson.pdf"
        Else If RadioButton2.Checked = True Then
            '        Else
            fileName = "c:\test_3\ross.pdf"
        End If

The reason being the checking will finish with the first time a 'true' is found.  Your original code will perform every check of the if statement.
Mark01Author Commented:
Thank you, Andy and Ryan.
BillSoftware EngineerCommented:
you need to pass the parameter in as explained above
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Visual Basic.NET

From novice to tech pro — start learning today.