Web Forms :: How To Add A Progressbar To Do A Search In A Datagriview

How can i add a progressbar to a search of a datagriview in my code :

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim nwindConn As SqlConnection = New SqlConnection("Data Source=.SQLEXPRESS;Initial Catalog=teste1;Integrated Security=SSPI;")
Dim selectCMD As SqlCommand = New SqlCommand("SELECT Username from TABELA1 WHERE Username = '" + TextBox2.Text + "'", nwindConn)
selectCMD.CommandTimeout = 30
Dim custDA As SqlDataAdapter = New SqlDataAdapter
custDA.SelectCommand = selectCMD
nwindConn.Open()
Dim custDS As DataSet = New DataSet
custDA.Fill(custDS, "TABELA1")
Dim bs As New BindingSource()
bs.DataSource = custDS.Tables("TABELA1")
' your dataset/data table
DataGridView1.DataSource = bs
usernameLabel.Text = IIf(custDS.Tables("TABELA1").Rows.Count > 0, "O utilizador já existe", "Poderá registar-se com esste nome")
nwindConn.Close()
End Sub