Label text remains unchanged - vb.net

Question

So I'm deliberately trying to make a Download ETA Calculator using Visual Basic 2013 Ultimate.. but after 3 hours of work, I tried running it but it won't show the final result (The Estimated Time). I am also asking you how to convert the result into Time format..
here is the code
Public Class Form1
Private Property z As Object
Private Sub Label1_Click(sender As Object, e As EventArgs)
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs)
End Sub
Private Sub LinkLabel1_LinkClicked(sender As Object, e As
LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked
Process.Start("www.speedtest.net")
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs)
Handles Button1.Click
Dim x, y, z, a As Integer
Dim sum
x = TextBox1.Text
y = TextBox2.Text
sum = Label1
If RadioButton1.Checked = True And RadioButton3.Checked = True Then
z = x / 1024 / y
a = z / 60
sum = a / 60
End If
If RadioButton1.Checked = True And RadioButton4.Checked = True Then
z = x / 1024 / y
a = z / 60 * 1024
sum = a / 60
End If
If RadioButton2.Checked = True And RadioButton3.Checked = True Then
z = x / 1048576 / y
a = z / 60
sum = a / 60
End If
If RadioButton2.Checked = True And RadioButton4.Checked = True Then
z = x / 1048576 / y
a = z / 60 * 1024
sum = a / 60
End If
End Sub
Private Sub RadioButton1_CheckedChanged(sender As Object, e As EventArgs)
Handles
RadioButton1.CheckedChanged
End Sub
End Class
Error 2
http://tny.cz/7b5711f7
Error 3
http://tny.cz/09bf1f96

Answer 1

Dim sum
sum = Label1
Presumably Label1 is a label control so you're setting a variable to be equal to the label control.
Later on, you're trying to set this variable of type label control to a decimal
sum = a / 60
I would say you want probably want to replace all your
sum = a / 60
with something like
label1.Text = New TimeSpan(a / 60, 0, 0).ToString()
and forget about variable sum all together