单击按钮时如何在ASP.NET 4.0中的Gridview上显示数据？

Imports System.Data.Odbc
Imports System.Data
Partial Class VIEW_SALARY_DETAILS
     Inherits System.Web.UI.Page

   Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
    Dim cons, query As String
    Dim con As OdbcConnection
    Dim adpt As OdbcDataAdapter
    cons = "dsn=Courier; UID=Courier; PWD=123;"
    con = New OdbcConnection(cons)
    con.Open()
    query = "select * from EMPLOYEE"
    Dim ds As DataSet
    adpt = New OdbcDataAdapter(query, con)
    ds = New DataSet
    adpt.Fill(ds, "Courier")
    GridView1.DataSource = ds.Tables()
    con.Close()
   End Sub
End Class
Imports System.Data.Odbc
Imports System.Data
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