Event Handler in Window application

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VB

i want to create event handler in windows application for that i write the following code...i have one gif image when i click convert button then my image are loading that is the image is rotating until the process completes this is my task...but when i click convert button then my image are hanged that is it's not rotating i dont know what is the problem...

my form

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        PictureBox1.Visible = False
        Label1.Text = "Ready!!!"
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        PictureBox1.Visible = True
        Label1.Text = "Converting, Please Wait!!!"
        Me.Refresh()
        Shell("runsometimes.exe", AppWinStyle.Hide, 1)
        Label1.Text = "Successfully Converted!!!"
        PictureBox1.Visible = False
    End Sub
End Class