Error in VB.NET code: "Argument not specified for parameter"

Question

When I place Set_Symbol() in my code it give me two errors.

Errors:

Argument not specified for parameter 'e' of 'Private Sub Set_Symbol(sender As Object, e As System.EventArgs)'. d:\documents\visual studio 2010\Projects\Math Game\Math Game\frmindex.vb

Argument not specified for parameter 'sender' of 'Private Sub Set_Symbol(sender As Object, e As System.EventArgs)'. d:\documents\visual studio 2010\Projects\Math Game\Math Game\frmindex.vb

This is what Set_Symbol is:

Private Sub Set_Symbol(ByVal sender As System.Object, ByVal e As System.EventArgs) _
    Handles rbnaddition.Click, rbnsubtraction.Click, rbnmultiplication.Click, rbndivision.Click
        Dim rbn As RadioButton
        rbn = CType(sender, RadioButton)
        symbol = rbn.Tag
    End Sub

This is how I called it:

Private Sub frmindex_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    symbolrbn(0) = rbnaddition
    symbolrbn(1) = rbnsubtraction
    symbolrbn(2) = rbnmultiplication
    symbolrbn(3) = rbndivision
    Set_Symbol()
    Populate()
End Sub

Why is it throwing this error?

Do you actually call it manually? Can you show us the code you placed it in? — BoltClock
– BoltClock, Commented Aug 25, 2011 at 10:32
Notice the Sub definition requires two parameters sender and e and you have not supplied it with any during Load. — John Alexiou
– John Alexiou, Commented Aug 25, 2011 at 10:51

Tim Schmelter · Accepted Answer · 2011-08-25 10:57:30Z

2

Set_Symbol() in frmindex_Load won't compile because the method takes two parameters but you are trying to call it without parameters.

You shouldn't mix event-handler code with code that is manually called because they are two different things. If you need to call a method from an event-handler as well as manually from somewhere else, you should provide a method that takes the appropriate parameters(or none if not needed) and call that from both locations.

If you actually wanted to set the Tag for each RadioButton, you should provide a method that takes no parameter and sets the Tag property for each RadioButton.

I assuming that the handler should read the Tag instead of set it.

edited Aug 25, 2011 at 10:57

answered Aug 25, 2011 at 10:42

Tim Schmelter

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3 Comments

BoltClock Over a year ago

... and from the looks of it, the manual call isn't necessary at all in the frmindex_Load() method since it's an event handler for a bunch of other things.

Konrad Rudolph Over a year ago

In fact, no exception is thrown, this is misleading. Rather, the compiler complains.

Tim Schmelter Over a year ago

@Konrad: adjusted accordingly.

Ignacio Soler Garcia · Accepted Answer · 2011-08-25 10:44:59Z

1

You should call Set_Symbol(sender,e) to make it compile

answered Aug 25, 2011 at 10:44

Ignacio Soler Garcia

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2 Comments

BoltClock Over a year ago

But what for? The (sender, e) of the form's Load event seem irrelevant to the Set_Symbol handler.

Ignacio Soler Garcia Over a year ago

If you're calling directly an event handler you should set the same parameters and event handler will do. You really should call Set_Symbol(rbnaddition,EventArgs.Empty) for example.

John Alexiou · Accepted Answer · 2011-08-25 10:58:04Z

Notice the Sub definition requires two parameters sender and e and you have not supplied it with any during Load. Luckily you already have a sender and e defined, if you chain the event. So you could directly handle the Load event like the radiobutton actions, or call it with the two parameters.

Private Sub Set_Symbol(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles rbnaddition.Click, rbnsubtraction.Click, rbnmultiplication.Click, _
rbndivision.Click, MyBase.Load
    Dim rbn As RadioButton
    rbn = CType(sender, RadioButton)
    If rbn IsNot Nothing then
        symbol = rbn.Tag
    End If
End Sub

or

Private Sub frmindex_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handles MyBase.Load
    symbolrbn(0) = rbnaddition
    symbolrbn(1) = rbnsubtraction
    symbolrbn(2) = rbnmultiplication
    symbolrbn(3) = rbndivision
    Set_Symbol(rbnaddition, Nothing)            'Default to '+' symbol
    Populate()
End Sub

Divyang Desai · Accepted Answer · 2016-12-31 07:01:35Z

-1

Imports System.Data.SqlClient

Public Class Form1
    'Dim con As New SqlConnection("Data Source=admin-pc\sqlexpress;Initial Catalog=employee;Integrated Security=True")
    Dim con As SqlConnection
    Dim cmd As SqlCommand

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        con = New SqlConnection("Data Source=admin-pc\sqlexpress;Initial Catalog=employee;Integrated Security=True")
        con.Open()
        cmd = New SqlCommand("insert into emp_table values('" &TextBox1.Text "')",con)

        cmd.ExecuteNonQuery()
        con.Close()

    End Sub
End Class

edited Dec 31, 2016 at 7:01

Divyang Desai

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answered Dec 31, 2016 at 6:18

karishma

1

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