不明白你的程式怎么运行的,VB里面怎么会有逗号
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim num As Integer
num = 1
Do Until num > 6
Label1.Text = num & ","
num = num + 2.4
Loop
Label1.Text = Label1.Text.Substring(0, Label1.Text.Length - 1)
End Sub